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Sample records for js rogers sr

  1. Recovery Act update from Sr. Advisor Matt Rogers-- End of Obligations

    Broader source: Energy.gov [DOE]

    Matt Rogers, Senior Advisor to the Secretary for Recovery Act Implementation, shares his thoughts as the Recovery Act reaches a critical milestone -- the end of the 2010 fiscal year and the last...

  2. Recovery Act update from Sr. Advisor Matt Rogers -- End of Obligations

    ScienceCinema (OSTI)

    Rogers, Matt

    2013-05-29

    Senior Advisor to the Secretary for Recovery Act Implementation Matt Rogers shares his thoughts as the Recovery Act reaches a critical milestone -- the end of the 2010 fiscal year and the last day to obligation contract and grant funding under the Recovery Act. For more information about the Recovery Act at the Department of Energy: http://www.energy.gov/recovery Follow the Department of Energy! http://facebook.com/energygov http://twitter.com/energy

  3. Roger M. Claycomb- Biography

    Broader source: Energy.gov [DOE]

    Roger Claycomb has more than 30 years of experience in the nuclear industry in both nuclear facility operations and oversight.

  4. Faces of Science: Roger Wiens

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Roger Wiens Faces of Science: Roger Wiens As a kid, Roger Wiens built model rockets and even a telescope. Today, Wiens fuels his passion for space by contributing to technology that is helping to explore Mars. March 4, 2015 Roger Wiens Roger Wiens, Space Contact Communications Office (505) 667-6700 SPACE Wiens' passion for space has no limits At nine years old, Roger Wiens built a telescope to sketch the features of Mars. Faces of Science: Roger Wiens 1:23 Faces of Science: Roger Wiens Forty

  5. Departure Roger Anthoine

    SciTech Connect (OSTI)

    2007-11-28

    Remerciements et discours du D.G. H.Schopper l'occasion du dpart de Roger Anthoine (attach de presse), qui travaillait dans la communication et quitte le Cern aprs 27 ans de service. Il gardait des relations avec des mdias internationaux et la presse locale; remise des cadeaux: album photo avec images des muss de Genve et un radio aviation; R.A. fait un rsum de ses activits et souvenirs et remercie ses collaborateurs

  6. Matt Rogers | Department of Energy

    Energy Savers [EERE]

    Rogers About Us Matt Rogers - McKinsey & Company Photo of Matt Rogers Matt Rogers is a Director in McKinsey & Company's San Francisco Office. He is focused on the role technology and innovation play in restructuring markets, especially in energy and capital intensive industries. Matt recently rejoined McKinsey after serving as the Senior Advisor to the Secretary of Energy for Recovery Act Implementation. In this role, he had responsibility for managing the Department of Energy's $35.2B

  7. Departure Roger Anthoine

    ScienceCinema (OSTI)

    None

    2011-04-25

    Remerciements et discours du D.G. H.Schopper à l'occasion du départ de Roger Anthoine (attaché de presse), qui travaillait dans la communication et quitte le Cern après 27 ans de service. Il gardait des relations avec des médias internationaux et la presse locale; remise des cadeaux: album photo avec images des musés de Genève et un radio aviation; R.A. fait un résumé de ses activités et souvenirs et remercie ses collaborateurs

  8. Faces of Science: Roger Wiens

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Roger Wiens March 4, 2015 Wiens' passion for space has no limits At nine years old, Roger Wiens built a telescope to sketch the features of Mars. 1:23 Faces of Science: Roger Wiens - 2 - Forty years later he returned to the Red Planet, this time as part of a team that invented ChemCam, a device aboard the rover Curiosity. Using a laser that packs the energy of a million light bulbs into a spot the size of a pinhead, ChemCam blasts pieces of Martian rock in search of elements like carbon and

  9. Jiangsu Jiasheng Photovoltaic Technology Co Ltd aka JS Solar...

    Open Energy Info (EERE)

    Jiasheng Photovoltaic Technology Co Ltd aka JS Solar Ltd Jump to: navigation, search Name: Jiangsu Jiasheng Photovoltaic Technology Co Ltd (aka JS Solar Ltd) Place: Jiangsu...

  10. Buckley, J.S. 02 PETROLEUM; PETROLEUM; ENHANCED RECOVERY; ASPHALTENES...

    Office of Scientific and Technical Information (OSTI)

    Reservoir Wettability and its Effect on Oil Recovery. Buckley, J.S. 02 PETROLEUM; PETROLEUM; ENHANCED RECOVERY; ASPHALTENES; MINERALS; SURFACES; MICA; WETTABILITY We report on the...

  11. J.S. 24 POWER TRANSMISSION AND DISTRIBUTION; VECTORS; ELECTRIC...

    Office of Scientific and Technical Information (OSTI)

    power and power factor of instantaneous phasors Hsu, J.S. 24 POWER TRANSMISSION AND DISTRIBUTION; VECTORS; ELECTRIC CURRENTS; ELECTRIC POTENTIAL; MONITORING; POWER SYSTEMS;...

  12. Science Showcase: George F. Smoot and Roger D. Kornberg | OSTI...

    Office of Scientific and Technical Information (OSTI)

    Science Showcase: George F. Smoot and Roger D. Kornberg Feature Archive George Smoot George F. Smoot won the 2006 Nobel Prize in Physics. George F. Smoot and Roger D. Kornberg have ...

  13. Matt Rogers on AES Energy Storage

    ScienceCinema (OSTI)

    Rogers, Matt

    2013-05-29

    The Department of Energy and AES Energy Storage recently agreed to a $17.1M conditional loan guarantee commitment. This project will develop the first battery-based energy storage system to provide a more stable and efficient electrical grid for New York State's high-voltage transmission network. Matt Rogers is the Senior Advisor to the Secretary for Recovery Act Implementation.

  14. THE FEDERAL ENERGY ADMINISTRATION By Roger Anders

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    FEDERAL ENERGY ADMINISTRATION By Roger Anders November 1980 U.S. Department of Energy Office of Management Office of the Executive Secretariat Office of History and Heritage Resources 1 Introduction For the three-year period between 1974 and 1977, the Federal Energy Administration implemented federal oil allocation and pricing regulations. An independent agency, the Federal Energy Administration was the successor of the Federal Energy Office, a short-term organization created to coordinate the

  15. Roger D. Kornberg Polymerase, DNA, RNA, and Transcription

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Roger D. Kornberg Polymerase, DNA, RNA, and Transcription Resources with Additional Information Roger D. Kornberg Credit: Linda A. Cicero/ Stanford News Service Roger D. Kornberg was awarded the 2006 Nobel Prize in Chemistry "for his studies of the molecular basis of eukaryotic transcription". He determined 'how DNA's genetic blueprint is read and used to direct the process for protein manufacture. Kornberg carried out a significant part of the research leading to this prize at the

  16. The Honorable Harold Rogers The Honorable Daniel K. Inouye

    Office of Environmental Management (EM)

    Washington, DC 20585 (enter date here, centered) The Honorable Harold Rogers The Honorable Daniel K. Inouye Chairman, Committee on Appropriations Chairman, Committee on...

  17. Roger Road Reservoir Single-Axis Photovoltaic Array

    Broader source: Energy.gov [DOE]

    In this photograph, the Roger Road Reclamation Water Reservoir features a 110-kilowatt (kW) solar array. This system was built on a reservoir deck as its special design allowed for a single-axis...

  18. VWA-0032- In the Matter of Roger W. Hardwick

    Broader source: Energy.gov [DOE]

    This Decision involves a complaint of reprisal filed by Roger W. Hardwick (also referred to as the Complainant) under the Department of Energy’s (DOE) Contractor Employee Protection Program, 10 C.F...

  19. VBA-0032- In the Matter of Roger H. Hardwick

    Broader source: Energy.gov [DOE]

    This Decision considers an Appeal of an Initial Agency Decision issued on July 6, 1999, on a complaint filed by Roger H. Hardwick (Hardwick or the complainant) under the Department of Energy (DOE)...

  20. SISGR-MuSR Investigations of Magnetic Semiconductors for Spintronics

    Office of Scientific and Technical Information (OSTI)

    Applications (Technical Report) | SciTech Connect Technical Report: SISGR-MuSR Investigations of Magnetic Semiconductors for Spintronics Applications Citation Details In-Document Search Title: SISGR-MuSR Investigations of Magnetic Semiconductors for Spintronics Applications Authors: Lichti, Roger Publication Date: 2014-03-27 OSTI Identifier: 1148701 Report Number(s): Final Report DOE Contract Number: SC0001769 Resource Type: Technical Report Research Org: Texas Tech University Sponsoring

  1. LANL Researcher Roger Wiens Discusses ChemCam

    ScienceCinema (OSTI)

    Wiens, Roger

    2014-08-12

    Discussion of the ChemCam instrument on the Curiosity Rover that occurred during the NASA press conference prior to launch of the Mars Science Laboratory. The ChemCam instrument was developed by Los Alamos National Laboratory and the French Space Institute. Los Alamos National Laboratory researcher Roger Wiens discusses the instrument on this video. ChemCam uses a laser to "zap" features of the Martian landscape and then uses a spectrometer to gather information about the composition of the sample. ChemCam will help the Curiosity Rover determine whether Mars is or was habitable. The Rover is expected to touch down on the Red Planet on August 5, 2012.

  2. SR0204

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    2 Media Contact: Julie Petersen (803) 725-2889 Allison Named DOE-SR Acting Manager Flag Ribbon Art AIKEN, SC; July 1 - Assistant Secretary for Environmental Management Jessie H. Roberson recently announced the designation of Jeffrey M. Allison as Acting Manager for the Department of Energy (DOE) Savannah River Operations Office (SR). Mr. Allison is a career member of the Senior Executive Service with over 19 years of experience in engineering, safety, health, process development, and management

  3. SR0208

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    , 2002 Media Contact: Julie Petersen (803) 725-2889 DOE-SR Announces Release Of SRS History Book Flag Ribbon Art Aiken, SC - Today the Department of Energy (DOE) Savannah River Operations Office (SR) released the comprehensive, technical history of the Savannah River Site (SRS), Savannah River Site at Fifty. The book chronicles the design, construction, and operation of SRS in South Carolina from 1950-2000. Savannah River Site at Fifty explores the events leading up to the decision to create the

  4. SR9903

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    22, 1999 Media Contact: Julie Petersen (803) 725-2889 DOE-SR To Prepare Supplemental Environmental Impact Statement On High-Level Waste System Alternatives Flag Ribbon Art AIKEN, SC; February 22 -Today the Department of Energy (DOE) Savannah River Operations Office (SR) issued a Notice of Intent to prepare a Supplemental Environmental Impact Statement (SEIS) on the proposed replacement of the existing In-Tank Precipitation (ITP) process at the Savannah River Site (SRS). Replacement of the

  5. DOE - Office of Legacy Management -- Rogers Iron Works Co - MO 10

    Office of Legacy Management (LM)

    Rogers Iron Works Co - MO 10 FUSRAP Considered Sites Site: ROGERS IRON WORKS CO. (MO.10 ) Elimination from consideration under FUSRAP Designated Name: Not Designated Alternate Name: Rogers Iron Co. MO.10-1 Location: Joplin , Missouri MO.10-1 Evaluation Year: 1990 MO.10-2 MO.10-3 Site Operations: Tested C-liner crushing methods. MO.10-1 Site Disposition: Eliminated - Potential for contamination considered remote based on limited quantities of material handled MO.10-3 MO.10-4 Radioactive Materials

  6. SR0014

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    November 30, 2000 Media Contact: Jim Giusti (803) 725-2889 Draft EIS Issued On Future Closures Of SRS High-Level Waste Tanks Flag Ribbon Graphic AIKEN, SC; November 30 - The Department of Energy (DOE) Savannah River Operations Office (SR) has published for public review and comment the Draft Environmental Impact Statement (EIS) on the proposed closing of additional high-level waste (HLW) tanks at the Savannah River Site (SRS). DOE-SR proposes to close the tank systems to protect human health and

  7. SR0207

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    30, 2002 Media Contact: Julie Petersen (803) 725-2889 Notice To Editors: DOE Releases SRS History Book Flag Ribbon Art WHO: U.S. Department of Energy (DOE) Savannah River Operations Office (SR) Acting Manager Jeffrey Allison will publicly release the recently published technical history of the Savannah River Site (SRS), SRS at Fifty. WHAT: Brief event involving local students and DOE-SR Acting Manager. WHEN: Wednesday, October 2, 2002, at 2:00 PM. WHERE: New Ellenton Middle School; SC Highway

  8. SR0706

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    4, 2007 Media Contact: James Giusti (803) 952-7697 james-r.giusti@srs.gov DOE Honors Hepner as Federal Small Business Manger of the Year AIKEN, S.C., – David W. Hepner, Sr., Community Affairs/Small Business Program Manager for the U.S. Department of Energy (DOE) Savannah River Operations Office (SR) was recently honored as the Federal Small Business Manager of the Year for his dedication and high achievement to encourage small business participation in Fiscal Year 2006. Winners of DOE’s 2006

  9. SR0008

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Wachenhut Receives Award Fee Flag Ribbon Art Note to Editors and News Directors The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period October 1, 1999, through March 31, 2000. A copy of the letter announcing DOE's award fee determination can be obtained by calling (803) 725-2889. -DOE- SR-00-08

  10. SR0106

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    31, 2001 Media Contact: Rick Ford (803) 725-2889 DOE Announces Wackenhut Services Inc. Award Fee Flag Ribbon Art Note To Editors and News Directors: The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period October 1, 2000, through March 31, 2001. -DOE- SR-01-06

  11. SR0302

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    8, 2003 Media Contact: Rick Ford (803) 725-2889 DOE Announces WSI Award Fee Flag Ribbon Art The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period October 1, 2002, through March 31, 2003. The letter announcing DOE's award fee determination is available by calling (803)725-2889. -DOE- SR-03

  12. SR0004

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    5, 1999 Media Contact: James R. Giusti (803) 725-2889 DOE Releases Accident Investigation Report On FB-Line Workers' Plutonium Intake Flag Ribbon Art Aiken, SC - The Department of Energy's Savannah River Operations Office (SR) today issued its Accident Investigation Board's findings on the cause of plutonium intakes by seven Savannah River Site (SRS) employees in the FB-Line facility. On September 1, 1999, plutonium was released from a failed plutonium storage canister at the Site's FB-Line

  13. SR0009

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    June 8, 2000 Media Contact: Rick Ford (803) 725-2889 WSRC Receives Award Fee Flag Ribbon Art Note to Editors and News Directors The Department of Energy (DOE) has determined the performance award fee earned by Westinghouse Savannah River Company for the evaluation period October 1, 1999, through March 31, 2000. To obatin a copy of the letter announcing DOE's award fee determination click here or call (803) 725-2889 -DOE- SR-00-08

  14. SR0013

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    25, 2000 Media Contact: Rick Ford (803) 725-2889 Savannah River Operations Office Wins Best Practices Award Flag Ribbon Graphic The Department of Energy's Savannah River Operations Office (SR) has received the FY2000 "Human Resources/Equal Employment Opportunity Best Practices" Award from the Federal Personnel Management Institute (FPMI). The award is presented annually by FPMI to a single Federal organization that has "demonstrated outstanding innovation and creativity in

  15. SR0015

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    , 2000 Media Contact: Jim Giusti (803) 725-2889 WSRC Receives Award Fee Flag Ribbon Graphic Note to Editors and News Directors The Department of Energy (DOE) has determined the performance award fee earned by Westinghouse Savannah River Company for the evaluation period April 1, 2000, through September 30, 2000. To obatin a copy of the letter announcing DOE's award fee determination click here or call (803) 725-2889 -DOE- SR-00-15 | Back |

  16. SR0018

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Rick Ford (803) 725-2889 Wackenhut Receives Award Fee Flag Ribbon Graphic The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period April 1, 2000, through September 30, 2000. To obatin a copy of the letter announcing DOE's award fee determination click here or call (803) 725-2889. -DOE- SR-00-18

  17. SR0102

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    30, 2001 Media Contact: Julie Petersen (803) 725-2889 DOE Annouces Availability of Draf SEIS On Salt PRocessing Alternatives Flag Ribbon Art Aiken, SC -- Today the Department of Energy (DOE) Savannah River Operations Office (SR) announces the availability of a Draft Supplemental Environmental Impact Statement (EIS) which evaluates alternatives for separating the high-activity and low-activity salt waste from the liquid high-level radioactive waste now stored in underground tanks at the Savannah

  18. SR0105

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    4, 2001 Media Contact: Julie Petersen (803) 725-2889 Doe Announces Availability Of Draft RFP On Salt Waste Processing Facility Flag Ribbon Art Aiken, SC; May 24, 2001 -- Today the Department of Energy (DOE) Savannah River Operations Office (SR) announced in the Commerce Business Daily the availability of the Draft Request for Proposals (RFP) for the acquisition of services to design, construct, and commission a facility to process the salt fraction of high-level radioactive waste currently

  19. SR0109

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    0, 2001 Media Contact: Julie Petersen (803) 725-2889 DOE ANNOUNCES AVAILABILITY OF FINAL SUPPLEMENTAL EIS AND IDENTIFIES PREFERRED SALT PROCESSING ALTERNATIVE Flag Ribbon Art AIKEN, SC; July 20 -Today the Department of Energy (DOE) Savannah River Operations Office (SR) announced the availability of the Savannah River Site Salt Processing Alternatives Final Supplemental Environmental Impact Statement (EIS). Based on DOE's evaluation of research results and comments received on the Draft

  20. SR0305

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    2, 2003 Media Contact: Jim Giusti (803) 725-2889 DOE Hosts Public Workshops on Historical Preservation of SRS' Cold War Resources Flag Ribbon Art Aiken, SC - The Department of Energy's Savannah River Operations Office (DOE-SR) will host this month two public information workshops & seek public comments on the preservation of historical "Cold War" resources at SRS. As part of its compliance with the National Historic Preservation Act (NHPA) of 1966 (as amended), the Department will

  1. SR9805

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    16, 1999 Media Contact: Rick Ford (803) 725-2889 WSCR Receives Award Fee Flag Ribbon Art The Department of Energy (DOE) has determined the performance award fees earned by Westinghouse Savannah River Company for the evaluation period October 1, 1998, through March 31, 1999. The letter announcing DOE's award fee determination is available by calling (803)725-2889. -DOE- SR-98-05

  2. SR9910

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    2, 1999 Media Contact: Bill Taylor (803) 725-2889 Wackenhut Receives Award Fee Flag Ribbon Art Note to Editors and News Directors The Department of Energy (DOE) has determined the performance award fee earned by Wackenhut Services, Incorporated, for the evaluation period January 25, 1999 through May 31, 1999. The letter announcing DOE’s award fee determination is available by calling (803) 725-2889 -DOE- SR-99-10 | Back |

  3. SR9917

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    6, 1999 Media Contact: Rick Ford (803) 725-2889 WSCR Receives Award Fee Flag Ribbon Art The Department of Energy (DOE) has determined the performance award fees earned by Westinghouse Savannah River Company for the evaluation period April 1, 1999, through September 30, 1999. The letter announcing DOE's award fee determination is available by calling (803)725-2889. -DOE- SR-99-17

  4. Charles Roger Alcock, 1996 | U.S. DOE Office of Science (SC)

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Charles Roger Alcock, 1996 The Ernest Orlando Lawrence Award Lawrence Award Home Nomination & Selection Guidelines Award Laureates 2010's 2000's 1990's 1980's 1970's 1960's Ceremony The Life of Ernest Orlando Lawrence Contact Information The Ernest Orlando Lawrence Award U.S. Department of Energy SC-2/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-2411 E: Email Us 1990's Charles Roger Alcock, 1996 Print Text Size: A A A FeedbackShare Page For his scientific

  5. Assistant Secretary Cathy Zoi and Senior Advisor Matt Rogers to Participate

    Office of Environmental Management (EM)

    Asset Utilization Index (AUI) Guidance Asset Utilization Index (AUI) Guidance AUI Guidance_090227.pdf (40.37 KB) More Documents & Publications Three Year Rolling Timeline The Department’s real property assets are vital to the accomplishment of its mission Three-year Rolling Timeline in Platts Energy Reporter Roundtable | Department of Energy

    Cathy Zoi and Senior Advisor Matt Rogers to Participate in Platts Energy Reporter Roundtable Assistant Secretary Cathy Zoi and Senior

  6. ROGER L. COPPLE ATTORNEY AT LAW FIRST NORTHERN PLAZA* P. O.

    Office of Legacy Management (LM)

    ROGER L. COPPLE ATTORNEY AT LAW FIRST NORTHERN PLAZA* P. O. Box 40 SANTA FE, NEW MEXICO 87501 (505) 982-4004 September 10, 1982 Professional Land Surveying 1404 Second Street Santa Fe, New Mexico 87501 ATTN: Gary Dawson Re: Bechtel National, Inc./United States Department of Energy - Contract No. DE-AC05-810R20722-FUSRAP Dear Mr. Dawson: As required by the terms of Purchase Contract No. 14501-01/04- PC-19 which involves the captioned contract I have prepared and en- close the following items:

  7. Micrometeorological data for energy-budget studies near Rogers Spring, Ash Meadows National Wildlife Refuge, Nye County, Nevada, 1994

    SciTech Connect (OSTI)

    Nichols, W.D.; Rapp, T.R.

    1996-05-01

    The data were collected at two sites near Rogers Spring for use in energy-budget studies beginning in 1994. The data collected at each site included net radiation, air temperature at two heights, dew- point temperature at two heights, windspeed at two heights, soil heat flux, and soil temperature in the interval between the land surface and the buried heat-flux plates.

  8. Paul V. Braun and John A. Rogers Materials Research Laboratory, University of Illinois at Urbana-Champaign

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    V. Braun and John A. Rogers Materials Research Laboratory, University of Illinois at Urbana-Champaign Three-Dimensionally Architectured Optoelectronics Achievement: We have developed an approach for three- dimensional template-directed epitaxy of high- performance III-V semiconductor materials. We have demonstrated optoelectronic functionality by fabricating a 3D photonic crystal LED, the rst- ever electrically driven emission from a 3D photonic crystal device. We also demonstrate that the LED

  9. John A. Rogers and Ralph G. Nuzzo Materials Research Laboratory, University of Illinois at Urbana-Champaign

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    A. Rogers and Ralph G. Nuzzo Materials Research Laboratory, University of Illinois at Urbana-Champaign Luminescent Waveguide Concentrator Photovoltaics Achievement: We have developed composite luminescent concentrator photovoltaic system that embeds large scale, interconnected arrays of microscale silicon solar cells in thin matrix layers loaded with luminescent dopants. We have efficiently launched wavelength-downconverted photons that waveguide into the sides and bottom surfaces of the sparse

  10. Delamere-JS

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Impact of Cloud Optical Properties on Longwave Radiation in the Arctic J. S. Delamere, E. J. Mlawer, and S. A. Clough Atmospheric and Environmental Research, Inc. Cambridge, Massachusetts K. H. Stamnes Stevens Institute of Technology Hoboken, New Jersey Introduction The surface energy budget of the Arctic is largely controlled by the net flow of solar and terrestrial radiation. Shortwave and longwave radiative fluxes are modulated by the surface properties, the vertical profiles of aerosols,

  11. SR0917.docx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (803) 952-7697 Monday, August 10, 2009 james-r.giusti@srs.gov DOE Hosts Public Workshop On Energy Park Concept at the Savannah River Site Aiken, SC (Aug. 8) -- The Department of Energy's (DOE) Savannah River Operations Office (SR) will sponsor a four-hour workshop on the concept of an energy park at the Savannah River Site on August 18, 2009, at the North Augusta Municipal Center, 100 Georgia Avenue, in North Augusta, South Carolina. This initial workshop will feature brief presentations by

  12. 2010sr26.doc

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Thursday, September 2, 2010 james-r.giusti@srs.gov SRS Federal Employees Give to Area Food Bank Aiken, SC -- Representatives of the U.S. Department of Energy's Savannah River Operations Office (DOE-SR) at the Savannah River Site delivered the sixth and final truckload of food and non perishables to the Golden Harvest Food Bank today. The 335 federal employees at SRS donated 66,292 pounds of goods in just over 30 days to feed the needy in Georgia and South Carolina. If one does the math, the

  13. SR-08-02.doc

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Media Contacts: For Immediate Release Embargoed until August 1, 2008 DOE: Julie Petersen, (803) 952-7697 julie.petersen@srs.gov SRNS: Will Callicott, (803) 952-9583 will.callicott@srs.gov DOE Authorizes New Contractor to Begin Management and Operations of the Savannah River Site Aiken, SC - Yesterday (July 31), the U.S. Department of Energy Savannah River Operations Office (DOE-SR) Manager, Jeffrey M. Allison, and the Savannah River Nuclear Solutions (SRNS) President and Chief Executive

  14. The J. Bennett Johnston Sr.

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Johnston Sr. Center for Advanced Microstructures and Devices (CAMD) EXCELLENCE IN SCIENCE AND ENGINEERING RESEARCH 2 Overview LSU's Center for Advanced Microstructures and Devices (CAMD) provides researchers access to the only synchrotron light source in the southeastern United States. One of seven such facilities in the nation, more than 150 researchers, including LSU faculty, industrial users, local startup companies, and members of national research labs, use CAMD. It is also a key resource

  15. Remedial investigation work plan for Chestnut Ridge Operable Unit 4 (Rogers Quarry/Lower McCoy Branch) at the Oak Ridge Y-12 Plant, Oak Ridge, Tennessee

    SciTech Connect (OSTI)

    Not Available

    1993-09-01

    The Oak Ridge Y-12 Plant includes - 800 acres near the northeast comer of the reservation and adjacent to the city of Oak Ridge (Fig. 1-1). The plant is a manufacturing and developmental engineering facility that produced components for various nuclear weapons systems and provides engineering support to other Energy Systems facilities. More than 200 contaminated sites have been identified at the Y-12 Plant that resulted from past waste management practices. Many of the sites have operable units (OUs) based on priority and on investigative and remediation requirements. This Remedial Investigation RI work plan specifically addresses Chestnut Ridge OU 4. Chestnut Ridge OU 4 consists of Rogers Quarry and Lower McCoy Branch (MCB). Rogers Quarry, which is also known as Old Rogers Quarry or Bethel Valley Quarry was used for quarrying from the late 1940s or early 1950s until about 1960. Since that time, the quarry has been used for disposal of coal ash and materials from Y-12 production operations, including classified materials. Disposal of coal ash ended in July 1993. An RI is being conducted at this site in response to CERCLA regulations. The overall objectives of the RI are to collect data necessary to evaluate the nature and extent of contaminants of concern, support an Ecological Risk Assessment and a Human Health Risk Assessment, support the evaluation of remedial alternatives, and ultimately develop a Record of Decision for the site. The purpose of this work plan is to outline RI activities necessary to define the nature and extent of suspected contaminants at Chestnut Ridge OU 4. Potential migration pathways also will be investigated. Data collected during the RI will be used to evaluate the risk posed to human health and the environment by OU 4.

  16. SR????

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    28, 2006 Media Contact: James Giusti (803) 952-7697 Note To Editors and News Directors: Aiken, SC – On Thursday, November 30, U.S. Department of Energy Assistant Secretary for Environmental Management James Rispoli will speak at a ceremony marking the completion of T Area Closure at the Savannah River Site. T Area was the first operational area at SRS, starting up in 1952 and continuing to serve the site until 2002, when demolition began on its 28 facilities. Demolition was completed in 2004,

  17. SR????

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    February 13, 2007 Media Contact: James Giusti (803) 952-7697 james-r.giusti@srs.gov DOE Seeks Public Input on Scope of Environmental Review for the Global Nuclear Energy Partnership Aiken, South Carolina – The U.S. Department of Energy’s Savannah River Operations Office today announced that the second public scoping meeting to begin the Programmatic Environmental Impact Statement (PEIS) for the President’s Global Nuclear Energy Partnership (GNEP) will be held on Thursday, February 15, 2007 at

  18. Brookhaven National Laboratory - Sr-90 BGGR/WCF | Department...

    Office of Environmental Management (EM)

    Sr-90 BGGRWCF Brookhaven National Laboratory - Sr-90 BGGRWCF January 1, 2014 - 12:00pm ... InstallationName, State: Brookhaven National Laboratory Responsible DOE Office: Office of ...

  19. Rapid method to determine 89Sr/90Sr in large concrete samples

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Maxwell, Sherrod L.; Culligan, Brian; Hutchison, Jay B.; Utsey, Robin C.; Sudowe, Ralf; McAlister, Daniel R.

    2016-03-24

    Here, a new rapid method has been developed that provides high quality low-level measurements of 89,90Sr in concrete samples with an MDA (Minimum Detectable Activity) of <1 mBq g-1. The new method is fast, meets new decommissioning regulatory limits and is robust even if refractory particles are present. The method utilizes a rapid fusion to ensure total dissolution of samples and rapid preconcentration and separation of 89,90Sr from 5-10 g concrete samples. When, the 89Sr/90Sr ratio is high, Sr can be isolated from up to 5g concrete samples, total 89/90Sr measured, and then 90Sr determined via 90Y separated after amore » period of ingrowth. Another approach allows the immediate determination of 90Sr in 10 g concrete aliquots without waiting for 90Y ingrowth, in instances where the shorter lived 89Sr is unlikely to be encountered.« less

  20. RADIOISOTOPE INVENTORY FOR TSPA-SR

    SciTech Connect (OSTI)

    C. Leigh; R. Rechard

    2001-01-30

    The total system performance assessment for site recommendation (TSPA-SR), on Yucca Mountain, as a site (if suitable) for disposal of radioactive waste, consists of several models. The Waste Form Degradation Model (i.e, source term) of the TSPA-SR, in turn, consists of several components. The Inventory Component, discussed here, defines the inventory of 26 radioisotopes for three representative waste categories: (1) commercial spent nuclear fuel (CSNF), (2) US Department of Energy (DOE) spent nuclear fuel (DSNF), and (3) high-level waste (HLW). These three categories are contained and disposed of in two types of waste packages (WPs)--CSNF WPs and co-disposal WPs, with the latter containing both DSNF and HLW. Three topics are summarized in this paper: first, the transport of radioisotopes evaluated in the past; second, the development of the inventory for the two WP types; and third, the selection of the most important radioisotopes to track in TSPA-SR.

  1. Role of SrMoO{sub 4} in Sr{sub 2}MgMoO{sub 6} synthesis

    SciTech Connect (OSTI)

    Vasala, S.; Yamauchi, H.; Karppinen, M.

    2011-05-15

    Here we investigate the elemental and phase compositions during the solid-state synthesis of the promising SOFC-anode material, Sr{sub 2}MgMoO{sub 6}, and demonstrate that molybdenum does not notably evaporate under the normal synthesis conditions with temperatures up to 1200 {sup o}C due to the formation of SrMoO{sub 4} as an intermediate product at low temperatures, below 600 {sup o}C. However, partial decomposition of the Sr{sub 2}MgMoO{sub 6} phase becomes evident at the higher temperatures ({approx}1500 {sup o}C). The effect of SrMoO{sub 4} on the electrical conductivity of Sr{sub 2}MgMoO{sub 6} is evaluated by preparing a series of Sr{sub 2}MgMoO{sub 6} samples with different amounts of additional SrMoO{sub 4}. Under the reducing operation conditions of an SOFC anode the insulating SrMoO{sub 4} phase is apparently reduced to the highly conductive SrMoO{sub 3} phase. Percolation takes place with 20-30 wt% of SrMoO{sub 4} in a Sr{sub 2}MgMoO{sub 6} matrix, with a notable increase in electrical conductivity after reduction. Conductivity values of 14, 60 and 160 S/cm are determined at 800 {sup o}C in 5% H{sub 2}/Ar for the Sr{sub 2}MgMoO{sub 6} samples with 30, 40 and 50 wt% of added SrMoO{sub 4}, respectively. -- Graphical abstract: SrMoO{sub 4} is formed at low temperatures during the synthesis of Sr{sub 2}MgMoO{sub 6}, which prevents the volatilization of Mo from typical precursor mixtures of this promising SOFC anode material. SrMoO{sub 4} is insulating and it is often found as an impurity in Sr{sub 2}MgMoO{sub 6} samples. It is however readily reduced to highly conducting SrMoO{sub 3}. Composites of Sr{sub 2}MgMoO{sub 6} and SrMoO{sub 3} show increased electrical conductivities compared to pure Sr{sub 2}MgMoO{sub 6} under the reductive operation conditions of an SOFC anode. Display Omitted Highlights: {yields} Sr{sub 2}MgMoO{sub 6} is a promising SOFC anode material. {yields} During the Sr{sub 2}MgMoO{sub 6} synthesis SrMoO{sub 4} is formed at low

  2. Fabrication of Sr silicate buffer layer on Si(100) substrate by pulsed laser deposition using a SrO target

    SciTech Connect (OSTI)

    Imanaka, Atsuhiro; Sasaki, Tsubasa; Hotta, Yasushi Satoh, Shin-ichi

    2014-09-01

    The authors fabricated 2??1 Sr-reconstructed Si(100) substrates using thin SrO layers, and used them to direct growth of crystalline perovskite oxide on Si. The SrO layers used to reconstruct the Si(100) substrates were grown by pulsed laser deposition from a SrO single crystal target, followed by postdeposition-annealing (PDA) of the SrO/Si(100) structure. In situ observations of reflective high-energy electron diffraction during PDA confirmed a 2??1 reconstruction of the Si surface and x-ray photoemission spectroscopy of the annealed samples confirmed the existence of Sr atoms in a silicate phase, which indicated that a 2??1 Sr-reconstructed Si surface was achieved. The optimal fabrication conditions were annealing at 720?C for 1?min and an equivalent SrO layer thickness (ML{sub eq}) of 2.5 ML{sub eq}. The temperature condition was very narrow, at 720??20?C, for an acceptable product. Subsequently, the authors demonstrated the growth of crystalline SrTiO{sub 3} films on the 2??1 Sr-reconstructed Si(100) surfaces.

  3. MHK Projects/SR 01 | Open Energy Information

    Open Energy Info (EERE)

    SR 01 < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... "minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"ty...

  4. Brookhaven National Laboratory - Sr90 - Chemical Holes | Department...

    Office of Environmental Management (EM)

    - Chemical Holes Brookhaven National Laboratory - Sr90 - Chemical Holes January 1, 2014 - ... InstallationName, State: Brookhaven National Laboratory Responsible DOE Office: Office of ...

  5. Brookhaven National Laboratory - Sr90-Former HWMF | Department...

    Office of Environmental Management (EM)

    -Former HWMF Brookhaven National Laboratory - Sr90-Former HWMF January 1, 2014 - 12:00pm ... InstallationName, State: Brookhaven National Laboratory Responsible DOE Office: Office of ...

  6. Carrier-Controlled Ferromagnetism in SrTiO3

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Moetakef, Pouya; Williams, James R.; Ouellette, Daniel G.; Kajdos, Adam P.; Goldhaber-Gordon, David; Allen, S. James; Stemmer, Susanne

    2012-06-27

    Magnetotransport and superconducting properties are investigated for uniformly La-doped SrTiO3 films and GdTiO3/SrTiO3 heterostructures, respectively. GdTiO3/SrTiO3 interfaces exhibit a high-density 2D electron gas on the SrTiO3 side of the interface, while, for the SrTiO3 films, carriers are provided by the dopant atoms. Both types of samples exhibit ferromagnetism at low temperatures, as evidenced by a hysteresis in the magnetoresistance. For the uniformly doped SrTiO3 films, the Curie temperature is found to increase with doping and to coexist with superconductivity for carrier concentrations on the high-density side of the superconducting dome. The Curie temperature of the GdTiO3/SrTiO3 heterostructures scales with themore » thickness of the SrTiO3 quantum well. The results are used to construct a stability diagram for the ferromagnetic and superconducting phases of SrTiO3.« less

  7. SISGR-MuSR Investigations of Magnetic Semiconductors for Spintronics...

    Office of Scientific and Technical Information (OSTI)

    SciTech Connect Search Results Technical Report: SISGR-MuSR Investigations of Magnetic Semiconductors for Spintronics Applications Citation Details In-Document Search Title: ...

  8. Audit Report: OAS-SR-05-02 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    SR-05-02 Audit Report: OAS-SR-05-02 December 28, 2004 Review of Executive Protection Travel Not Available for Viewing More Documents & Publications Special Report: OAS-SR-04-01 Special Report: OAS-SR-05-03 Special Report: OAS-SR-05-01

  9. Superconducting and magnetic properties of Sr?Ir?Sn??

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Biswas, P. K.; Wang, Kefeng; Amato, A.; Khasanov, R.; Luetkens, H.; Petrovic, C.; Cook, R. M.; Lees, M. R.; Morenzoni, E.

    2014-10-10

    Magnetization and muon spin relaxation or rotation (SR) measurements have been performed to study the superconducting and magnetic properties of Sr?Ir?Sn??. From magnetization measurements the lower and upper critical fields of Sr?Ir?Sn?? are found to be 81(1) Oe and 14.4(2) kOe, respectively. Zero-field SR data show no sign of any magnetic ordering or weak magnetism in Sr?Ir?Sn??. Transverse-field SR measurements in the vortex state provided the temperature dependence of the magnetic penetration depth ?. The dependence of ?? with temperature is consistent with the existence of single s-wave energy gap in the superconducting state of Sr?Ir?Sn?? with a gap valuemoreof 0.82(2) meV at absolute zero temperature. The magnetic penetration depth at zero temperature ?(0) is 291(3) nm. The ratio ?(0)/kBTc = 2.1(1) indicates that Sr?Ir?Sn?? should be considered as a strong-coupling superconductor.less

  10. Transmutation of [sup 90]Sr by inertial confinement fusion

    SciTech Connect (OSTI)

    Takashita, Hirofumi; Konashi, Kenji )

    1993-11-01

    Transmutation of [sup 90]Sr by inertial confinement fusion is discussed. A pellet composed of deuterium-tritium fuel surrounded by [sup 90]Sr is compressed by a laser or a particle beam. It is shown that a high transmutation rate and a small transmutation energy are obtained because of the highly compressed [sup 90]Sr, which has a large probability of a transmutation reaction. The number of cycles, including recovering and refabrication of the target, is also discussed. 16 refs., 8 figs., 2 tabs.

  11. Special Report: OAS-SR-05-01 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    05-01 Special Report: OAS-SR-05-01 October 1, 2004 Department's Process of Responding to a Congressional Information Request Not Available for Viewing More Documents & Publications Special Report: OAS-SR-04-01 Audit Report: OAS-SR-05-02 Special Report: OAS-SR-05-03

  12. Special Report: OAS-SR-04-01 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    4-01 Special Report: OAS-SR-04-01 July 22, 2004 Executive Protection and Scheduling and Advance Staff Travel in April 2004 Not Available for Viewing More Documents & Publications Audit Report: OAS-SR-05-02 Special Report: OAS-SR-05-03 Special Report: OAS-SR-05-01

  13. Special Report: OAS-SR-05-03 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    5-03 Special Report: OAS-SR-05-03 April 13, 2005 Review of Environmental Management Controls Not Available for Viewing More Documents & Publications Special Report: OAS-SR-04-01 Summary Special Report: OAS-SR-06-01 Audit Report: OAS-SR-05-02

  14. Rb-Sr Geochronologic Investigation Of Precambrian Samples From...

    Open Energy Info (EERE)

    Rb-Sr Geochronologic Investigation Of Precambrian Samples From Deep Geothermal Drill Holes, Fenton Hill, New Mexico Jump to: navigation, search OpenEI Reference LibraryAdd to...

  15. .sup.82 Sr-.sup.82 Rb Radioisotope generator

    DOE Patents [OSTI]

    Grant, Patrick M.; Erdal, Bruce R.; O'Brien, Harold A.

    1976-01-01

    An improved .sup.82 Sr-.sup.82 Rb radioisotope generator system, based upon the complexing ion exchange resin Chelex-100, has been developed. Columns of this material can be easily and rapidly milked, and the Rb-Sr separation factor for a fresh generator was found to be > 10.sup.7. Approximately 80 percent of the .sup.82 Rb present was delivered in a 15-ml volume of aqueous 0.2 M NH.sub.4 Cl solution. After more than 6 liters of eluant had been put through the generator, the Rb-Sr separation factor was still observed to be > 10.sup.5, and no unusual strontium breakthrough behavior was seen in the system over nearly three .sup.82 Sr half lives.

  16. VBH-0083- In the Matter of S.R. Davis

    Broader source: Energy.gov [DOE]

    S.R. Davis (the Employee) filed a complaint against her former employer, Fluor Fernald, Inc. (the Contractor) under the Department of Energy (DOE) Contractor Employee Protection Program, 10 C.F.R....

  17. VWA-0024- In the Matter of Russell P. Marler, Sr.

    Broader source: Energy.gov [DOE]

    This Decision involves a complaint filed by Russell P. Marler, Sr. (Marler or “the complainant”) under the Department of Energy (DOE) Contractor Employee Protection Program, codified at 10 C.F.R....

  18. VBA-0083- In the Matter of S.R. Davis

    Broader source: Energy.gov [DOE]

    This Decision considers an Appeal of an Initial Agency Decision (IAD) issued on April 21, 2004, involving a complaint filed by S.R. Davis (also referred to as the Complainant) under the Department...

  19. U. S. Department of Energy Savannah River Operations Office - DOE-SR News

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Releases Releases DOE-SR News Releases DOE-SR Exercises Option on Management and Operating Contract SR-2016-08-04 Adobe Acrobat PDF DOE Releases Final Request for Proposal for Savannah River Site Liquid Waste Services SR-2016-06-30 Adobe Acrobat PDF DOE HOLDS RIBBON CUTTING FOR NEW SALT WASTE PROCESSING FACILITY SR-2016-06-21 Adobe Acrobat PDF DOE DECLARES CONSTRUCTION OF SALT WASTE PROCESSING FACILITY COMPLETE SR-2016-06 Adobe Acrobat PDF DOE Releases Draft Request for Proposal and

  20. Optical and structural stability of blue SrO:Eu{sup 2+} phosphor

    SciTech Connect (OSTI)

    Komatsu, Keiji; Nakamura, Atsushi; Ohshio, Shigeo; Toda, Ikumi; Muramatsu, Hiroyuki; Saitoh, Hidetoshi

    2013-08-15

    Chemical stability of 6-coodinated SrO is a fundamental problem when this is used for various applications. In this study, optical and chemical stabilities of 8-coordinated SrO:Eu{sup 2+} phosphor were investigated. SrO:Eu{sup 2+} phosphor was synthesized from thermal treatment of SrO:Eu powder located on a single crystalline MgO at 1500 C under reduction atmosphere. Obtained 8-coordinated SrO:Eu{sup 2+} phosphor exhibit strong blue luminescence and chemical stability in distilled water for 3 days. Our findings prove that obtained 8-coordinated SrO:Eu{sup 2+} possesses relative optical and chemical stabilities in water. - Graphical abstract: Obtained 8-coordinated SrO:Eu{sup 2+} phosphor exhibit strong blue luminescence in distilled water. Highlights: We investigated optical and chemical stabilities of 8-coordinated SrO:Eu{sup 2+} phosphor in water. Obtained 8-coordinated SrO:Eu{sup 2+} phosphor exhibit strong blue luminescence and chemical stability in distilled water for 3 days. We found that the 8-coodrodinated SrO crystal structure changed to SrCO{sub 3} crystal structure after the 5 days immersion. The obtained SrO:Eu{sup 2+} phosphor possesses high chemical stability under water, compared with commercial (6-coordinated) SrO.

  1. Special Inquiry: OAS-SR-11-01 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    SR-11-01 Special Inquiry: OAS-SR-11-01 May 18, 2011 Allegations Regarding Western Area Power Administration's Desert Southwest Reigon The U.S. Office of Special Counsel requested...

  2. Summary Special Report: OAS-SR-06-01 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Summary Special Report: OAS-SR-06-01 October 7, 2005 Management of the Clean Cities Conference PDF icon Summary Special Report: OAS-SR-06-01 More Documents & Publications...

  3. Electrolyte Gate-Controlled Kondo Effect in SrTiO3 (Journal Article...

    Office of Scientific and Technical Information (OSTI)

    Electrolyte Gate-Controlled Kondo Effect in SrTiO3 Prev Next Title: Electrolyte Gate-Controlled Kondo Effect in SrTiO3 Authors: Lee, Menyoung ; Williams, J. R. ; Zhang, Sipei ...

  4. Synthesis of BiPbSrCaCuO superconductor

    DOE Patents [OSTI]

    Hults, W.L.; Kubat-Martin, K.A.; Salazar, K.V.; Phillips, D.S.; Peterson, D.E.

    1994-04-05

    A process and a precursor composition for preparing a lead-doped bismuth-strontium-calcium-copper oxide superconductor of the formula Bi[sub a]Pb[sub b]Sr[sub c]Ca[sub d]Cu[sub e]O[sub f] wherein a is from about 1.7 to about 1.9, b is from about 0.3 to about 0.45, c is from about 1.6 to about 2.2, d is from about 1.6 to about 2.2, e is from about 2.97 to about 3.2 and f is 10[+-]z by reacting a mixture of Bi[sub 4]Sr[sub 3]Ca[sub 3]Cu[sub 4]O[sub 16[+-]z], an alkaline earth metal cuprate, e.g., Sr[sub 9]Ca[sub 5]Cu[sub 24]O[sub 41], and an alkaline earth metal plumbate, e.g., Ca[sub 2[minus]x]Sr[sub x]PbO[sub 4] wherein x is about 0.5, is disclosed.

  5. Synthesis of BiPbSrCaCuO superconductor

    DOE Patents [OSTI]

    Hults, William L.; Kubat-Martin, Kimberly A.; Salazar, Kenneth V.; Phillips, David S.; Peterson, Dean E.

    1994-01-01

    A process and a precursor composition for preparing a lead-doped bismuth-strontium-calcium-copper oxide superconductor of the formula Bi.sub.a Pb.sub.b Sr.sub.c Ca.sub.d Cu.sub.e O.sub.f wherein a is from about 1.7 to about 1.9, b is from about 0.3 to about 0.45, c is from about 1.6 to about 2.2, d is from about 1.6 to about 2.2, e is from about 2.97 to about 3.2 and f is 10.+-.z by reacting a mixture of Bi.sub.4 Sr.sub.3 Ca.sub.3 Cu.sub.4 O.sub.16.+-.z, an alkaline earth metal cuprate, e.g., Sr.sub.9 Ca.sub.5 Cu.sub.24 O.sub.41, and an alkaline earth metal plumbate, e.g., Ca.sub.2-x Sr.sub.x PbO.sub.4 wherein x is about 0.5, is disclosed.

  6. Lower to middle Miocene isotope ( sup 87 Sr/ sup 86 Sr,. delta. sup 18 O,. delta. sup 13 C) standard sections, DSDP site 608

    SciTech Connect (OSTI)

    Miller, K.G.; Feigenson, M.D. ); Wright, J.D. )

    1990-05-01

    Isotopes changes ({sup 87}Sr/{sup 86}Sr, {delta}{sup 18}O, {delta}{sup 13}C) have been correlated to the geologic time scale primarily by biostratigraphy. Biostratigraphic correlations suffer from problems of diachrony and taxonomy. Magnetostratigraphy provides a facies-independent correlation tool, but there are few Tertiary sections with unambiguous magnetostratigraphy. The authors previously developed an isotope standard for the Oligocene at the only location with a pristine magnetochronology, Site 522. They extend this approach to Site 608 in the northeastern North Atlantic, which contains a relatively straightforward Miocene magnetochronology. They establish Miocene oxygen isotope Chronozones MI1 through MI6 at Sites 522 and 608, which are directly tied to the geomagnetic polarity time scale (GPTS). The integration of stable isotopes, Sr isotopes, biostratigraphy, and magnetostratigraphy at site 608 provides a standard section with which other Sr isotope and oxygen isotope records can be correlated. For example, using oxygen isotopes to correlate, the Sr isotope record from Site 608 compares well with previously published records from Sites 516 and 590. The firm ties of the Oligocene to middle Miocene isotope records with the GPTS allows them to establish the nature of the change in Sr isotopes between 38 and 8 Ma. There were moderately high rates of {sup 87}Sr/{sup 86}Sr change during the Oligocene ({approximately}0.000030/m.y.), yielding stratigraphic resolution of {plus minus}1.0 m.y. The rate of change of {sup 87}Sr/{sup 86}Sr increased during the early Miocene. They estimate that the rate of change between 23 and 15 Ma was greater than 0.000060/m.y. Given their ability to reproduce Sr isotope measurements ({plus minus}0.000020 to {plus minus}0.000030), temporal resolution is better than {plus minus}0.5 my. for the early to early middle Oliocene.

  7. Infrared spectroscopy of CaTiO3, SrTiO3, BaTiO3, Ba0.5Sr0.5TiO3...

    Office of Scientific and Technical Information (OSTI)

    Infrared spectroscopy of CaTiO3, SrTiO3, BaTiO3, Ba0.5Sr0.5TiO3 thin films, and (BaTiO3)5(SrTiO3)5 superlattice grown on SrRuO3SrTiO3(001) substrates Citation Details In-Document ...

  8. Antonios Kelarakis > Sr. Researcher - University of Central Lancashire >

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Center Alumni > The Energy Materials Center at Cornell Antonios Kelarakis Sr. Researcher - University of Central Lancashire antonios.kelarakis@gmail.com Dr. Kelarakis worked with the Giannelis Group while at Cornell. He has since joined the University of Central Lancashire, where he is a Senior Researcher/Guild Research Fellow with School of Forensic and Investigative Sciences. Antonio's research interests include colloids, biomaterials, smart coatings and nanostructured materials for

  9. Unconventional Switching Behavior in La0.7Sr0.3MnO3/La0.7Sr0...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Unconventional Switching Behavior in La0.7Sr0.3MnO3La0.7Sr0.3CoO3 Exchange-spring Bilayer Monday, March 30, 2015 Interfacial magnetic interactions between ferromagnetic...

  10. Transverse thermoelectric effect in La{sub 0.67}Sr{sub 0.33}MnO{sub 3}|SrRuO{sub 3} superlattices

    SciTech Connect (OSTI)

    Shiomi, Y.; Handa, Y.; Kikkawa, T.; Saitoh, E.

    2015-06-08

    Transverse thermoelectric effects in response to an out-of-plane heat current have been studied in an external magnetic field for ferromagnetic superlattices consisting of La{sub 0.67}Sr{sub 0.33}MnO{sub 3} and SrRuO{sub 3} layers. The superlattices were fabricated on SrTiO{sub 3} substrates by pulsed laser deposition. We found that the sign of the transverse thermoelectric voltage for the superlattices is opposite to that for La{sub 0.67}Sr{sub 0.33}MnO{sub 3} and SrRuO{sub 3} single layers at 200?K, implying an important role of spin Seebeck effects inside the superlattices. At 10?K, the magnetothermoelectric curves shift from the zero field due to an antiferromagnetic coupling between layers in the superlattices.

  11. Phase stability of the SrMnO[subscript 3] hexagonal perovskite...

    Office of Scientific and Technical Information (OSTI)

    SrMnOsubscript 3 hexagonal perovskite system at high pressure and temperature Citation ... Country of Publication: United States Language: ENGLISH Word Cloud More Like This Full ...

  12. U. S. Department of Energy Savannah River Operations Office - DOE-SR News

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Release Archive Release Archive DOE-SR News Release Archive 2012 News Releases Savannah River Site Reaches Significant Milestone with Waste Tank Closure SR-2012-06 Adobe Acrobat PDF DOE to Extend Savannah River Nuclear Solutions Contract at Savannah River Site to September 2016 SR-2012-05 Adobe Acrobat PDF Savannah River Site Federal Employees Volunteer for United Way Campaign SR-2012-04 Adobe Acrobat PDF Installation of Six Large Process Tanks Mark Big Step in Construction of Critical Waste

  13. Hyperpolarizability Effects in a Sr Optical Lattice Clock

    SciTech Connect (OSTI)

    Brusch, Anders; Le Targat, Rodolphe; Baillard, Xavier; Fouche, Mathilde; Lemonde, Pierre

    2006-03-17

    We report the observation of a higher-order frequency shift due to the trapping field in a {sup 87}Sr optical lattice clock. We show that, at the magic wavelength of the lattice, where the first-order term cancels, the higher-order shift will not constitute a limitation to the fractional accuracy of the clock at a level of 10{sup -18}. This result is achieved by operating the clock at very high trapping intensity up to 400 kW/cm{sup 2} and by a specific study of the effect of the two two-photon transitions near the magic wavelength.

  14. Atomic Structure of Au329(SR)84 Faradaurate Plasmonic Nanomolecules

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Kumara, Chanaka; Zuo, Xiaobing; Ilavsky, Jan; Cullen, David; Dass, Amala

    2015-04-03

    To design novel nanomaterials, it is important to precisely control the composition, determine the atomic structure, and manipulate the structure to tune the materials property. Here we present a comprehensive characterization of the material whose composition is Au329(SR)84 precisely, therefore referred to as a nanomolecule. The size homogeneity was shown by electron microscopy, solution X-ray scattering, and mass spectrometry. We proposed its atomic structure to contain the Au260 core using experiments and modeling of a total-scattering-based atomic-pair distribution functional analysis. HAADF-STEM images shows fcc-like 2.0 ± 0.1 nm diameter nanomolecules.

  15. Magnetic Ordering in Sr3YCo4O10+x

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Kishida, Takayoshi; Kapetanakis, Myron D.; Yan, Jiaqiang; Sales, Brian C.; Pantelides, Sokrates T.; Pennycook, Stephen J.; Chisholm, Matthew F.

    2016-01-28

    Transition-metal oxides often exhibit complex magnetic behavior due to the strong interplay between atomic-structure, electronic and magnetic degrees of freedom. Cobaltates, especially, exhibit complex behavior because of cobalt’s ability to adopt various valence and spin state configurations. The case of the oxygen-deficient perovskite Sr3YCo4O10+x (SYCO) has gained considerable attention because of persisting uncertainties about its structure and the origin of the observed room temperature ferromagnetism. Here we report a combined investigation of SYCO using aberration-corrected scanning transmission electron microscopy and density functional theory calculations.

  16. Matt Rogers on AES Energy Storage

    Broader source: Energy.gov [DOE]

    The Department of Energy and AES Energy Storage recently agreed to a $17.1M conditional loan guarantee commitment. This project will develop the first battery-based energy storage system to provide...

  17. Roger Seitz Savannah River National Laboratory

    Office of Environmental Management (EM)

    Roderick Jackson About Us Roderick Jackson - Technical Lead, Oak Ridge National Lab Roderick Jackson leads the Building Envelope Systems Research Group at the Department of Energy's Oak Ridge National Laboratory and serves as the technical lead for the Additive Manufacturing Integrated Energy (AMIE) demonstration project. He holds a bachelor's, master's, and Ph.D. in mechanical engineering from Georgia Tech. More about the AMIE demonstration project can be found:

  18. Structural properties of Ge on SrTiO{sub 3} (001) surface and Ge/SrTiO{sub 3} interface

    SciTech Connect (OSTI)

    Pu, Long; Wang, Jianli Tang, Gang; Zhang, Junting

    2015-03-14

    Germanium−perovskite oxide heterostructures have a strong potential for next-generation low-voltage and low-leakage metal-oxide semiconductor field-effect transistors. We investigated the atomic structure and electronic properties of Ge on perfect and defective (001) SrTiO{sub 3} by first-principle calculations. The specific adsorption sites at the initial growth stage and the atomic structure of Ge on the SrTiO{sub 3} (001) substrate have been systematically investigated. The surface grand potential was calculated and compared as a function of the relative chemical potential. The complete surface phase diagram was presented. The energetically favorable interfaces were pointed out among the atomic arrangements of the Ge/SrTiO{sub 3} (001) interfaces. The atomic structure and electronic properties of the intrinsic point defects were calculated and analyzed for the Ge/SrTiO{sub 3} (001) interfaces.

  19. Stoichiometric growth of SrTiO3 films by sequential pulsed laser deposition from SrO and TiO2 targets

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Herklotz, A; Dorr, Kathrin; Biegalski, Michael D

    2015-01-01

    We report the growth of stoichiometric SrTiO3 films by sequential pulsed laser deposition from SrO and TiO2 targets. In-situ reflection high-energy electron diffraction is used to control the growth and achieve films with excellent structural quality. The growth shows similarities to the case of molecular beam epitaxy of SrTiO3 from Sr and Ti sources. In order to further demonstrate the capability of the approach, we grow artificial Srn+1TinO3n+1 Ruddlesden-Popper phases with n = 2 and 3. Our result has potential to be extendable to other perovskite-type oxides, enabling one to grow epitaxial films with improved structural quality and electronic functionality.

  20. Ferroelectric-like response from the surface of SrTiO₃ crystals at high temperatures

    SciTech Connect (OSTI)

    Jyotsna, Shubhra; Arora, Ashima; Sekhon, Jagmeet S.; Sheet, Goutam

    2014-09-14

    Since SrTiO₃ has a high dielectric constant, it is used as a substrate for a large number of complex physical systems for electrical characterization. Since SrTiO₃ crystals are known to be non-ferroelectric/non-piezoelectric at room temperature and above, SrTiO₃ has been believed to be a good choice as a substrate/base material for PFM (Piezoresponse Force Microscopy) on novel systems at room temperature. In this paper, from PFM-like measurement using an atomic force microscope on bare crystals of (110) SrTiO₃ we show that ferroelectric and piezoelectric-like response may originate from bare SrTiO₃ at remarkably high temperatures up to 420 K. Electrical domain writing and erasing are also possible using a scanning probe tip on the surface of SrTiO₃ crystals. This observation indicates that the role of the electrical response of SrTiO₃ needs to be revisited in the systems where signature of ferroelectricity/piezoelectricity has been previously observed with SrTiO₃ as a substrate/base material.

  1. Resistance switching in epitaxial SrCoO{sub x} thin films

    SciTech Connect (OSTI)

    Tambunan, Octolia T.; Parwanta, Kadek J.; Acharya, Susant K.; Lee, Bo Wha; Jung, Chang Uk; Kim, Yeon Soo; Park, Bae Ho; Jeong, Huiseong; Park, Ji-Yong; Cho, Myung Rae; Park, Yun Daniel; Choi, Woo Seok; Kim, Dong-Wook; Jin, Hyunwoo; Lee, Suyoun; Song, Seul Ji; Kang, Sung-Jin; Kim, Miyoung; Hwang, Cheol Seong

    2014-08-11

    We observed bipolar switching behavior from an epitaxial strontium cobaltite film grown on a SrTiO{sub 3} (001) substrate. The crystal structure of strontium cobaltite has been known to undergo topotactic phase transformation between two distinct phases: insulating brownmillerite (SrCoO{sub 2.5}) and conducting perovskite (SrCoO{sub 3−δ}) depending on the oxygen content. The current–voltage characteristics of the strontium cobaltite film showed that it could have a reversible insulator-to-metal transition triggered by electrical bias voltage. We propose that the resistance switching in the SrCoO{sub x} thin film could be related to the topotactic phase transformation and the peculiar structure of SrCoO{sub 2.5}.

  2. Accurate Optical Lattice Clock with {sup 87}Sr Atoms

    SciTech Connect (OSTI)

    Le Targat, Rodolphe; Baillard, Xavier; Fouche, Mathilde; Brusch, Anders; Tcherbakoff, Olivier; Rovera, Giovanni D.; Lemonde, Pierre

    2006-09-29

    We report a frequency measurement of the {sup 1}S{sub 0}-{sup 3}P{sub 0} transition of {sup 87}Sr atoms in an optical lattice clock. The frequency is determined to be 429 228 004 229 879(5) Hz with a fractional uncertainty that is comparable to state-of-the-art optical clocks with neutral atoms in free fall. The two previous measurements of this transition were found to disagree by about 2x10{sup -13}, i.e., almost 4 times the combined error bar and 4 to 5 orders of magnitude larger than the claimed ultimate accuracy of this new type of clocks. Our measurement is in agreement with one of these two values and essentially resolves this discrepancy.

  3. U-Sr isotopic speedometer: Fluid flow and chemical weatheringrates inaquifers

    SciTech Connect (OSTI)

    Maher, Kate; DePaolo, Donald J.; Christensen, John N.

    2005-12-27

    Both chemical weathering rates and fluid flow are difficultto measure in natural systems. However, these parameters are critical forunderstanding the hydrochemical evolution of aquifers, predicting thefate and transport of contaminants, and for water resources/water qualityconsiderations. 87Sr/86Sr and (234U/238U) activity ratios are sensitiveindicators of water-rock interaction, and thus provide a means ofquantifying both flow and reactivity. The 87Sr/86Sr values in groundwaters are controlled by the ratio of the dissolution rate to the flowrate. Similarly, the (234U/238U) ratio of natural ground waters is abalance between the flow rate and the dissolution of solids, andalpha-recoil loss of 234U from the solids. By coupling these two isotopesystems it is possible to constrain both the long-term (ca. 100's to1000's of years) flow rate and bulk dissolution rate along the flow path.Previous estimates of the ratio of the dissolution rate to theinfiltration flux from Sr isotopes (87Sr/86Sr) are combined with a modelfor (234U/238U) to constrain the infiltration flux and dissolution ratefor a 70-m deep vadose zone core from Hanford, Washington. The coupledmodel for both (234U/238U) ratios and the 87Sr/86Sr data suggests aninfiltration flux of 5+-2 mm/yr, and bulk silicate dissolution ratesbetween 10-15.7 and 10-16.5 mol/m2/s. The process of alpha-recoilenrichment, while primarily responsible for the observed variation in(234U/238U) of natural systems, is difficult to quantify. However, therate of this process in natural systems affects the interpretation ofmost U-series data. Models for quantifying the alpha-recoil loss fractionbased on geometric predictions, surface area constraints, and chemicalmethods are also presented. The agreement between the chemical andtheoretical methods, such as direct measurement of (234U/238U) of thesmall grain size fraction and geometric calculations for that sizefraction, is quite good.

  4. News Media Contact: For Immediate Release Amy C. Scales, DOE-SR Wednesday, June 11, 2014

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Contact: For Immediate Release Amy C. Scales, DOE-SR Wednesday, June 11, 2014 (803) 952-7213 amy.caver@srs.gov U.S. Department of Energy Names New Deputy Manager AIKEN, S.C. (June 11, 2014) - The U.S. Department of Energy, Savannah River Operations Office (DOE-SR), announced today the selection of Mr. Terrel "Terry" J. Spears as the Deputy Manager of the Savannah River Site. "We are pleased to have Terry as our Deputy Manager," David Moody, DOE-SR Manager, said. "He has

  5. Epitaxial Cr on n-SrTiO3(001)An ideal Ohmic contact

    SciTech Connect (OSTI)

    Capan, Cigdem; Sun, Guangyuan; Bowden, Mark E.; Chambers, Scott A.

    2012-01-30

    Epitaxial Cr metallizations grown on n-SrTiO3(001) by molecular beam epitaxy are shown to result in an ordered interface with Cr bound to O in the terminal TiO2 layer, no reduction of the SrTiO3, and a near-perfect Ohmic contact. Cr/n-SrTiO3(001) thus constitutes an ideal interface between a pure metal and wide gap oxide in which interface redox chemistry does not occur, and the Fermi level remains unpinned.

  6. Epitaxial Cr on n-SrTiO{sub 3}(001) - An ideal Ohmic contact

    SciTech Connect (OSTI)

    Capan, C.; Sun, G. Y.; Bowden, M. E.; Chambers, S. A.

    2012-01-30

    Epitaxial Cr metallizations grown on n-SrTiO{sub 3}(001) by molecular beam epitaxy are shown to result in an ordered interface with Cr bound to O in the terminal TiO{sub 2} layer, no reduction of the SrTiO{sub 3}, and a near-perfect Ohmic contact. Cr/n-SrTiO{sub 3}(001) thus constitutes an ideal interface between a pure metal and wide gap oxide in which interface redox chemistry does not occur, and the Fermi level remains unpinned.

  7. DOE-SR Exercises Option on Management and Operating Contract | Department

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    of Energy DOE-SR Exercises Option on Management and Operating Contract DOE-SR Exercises Option on Management and Operating Contract August 4, 2016 - 12:00pm Addthis Media Contact: Jim Giusti, DOE-SR, (803) 952-8283 james-r.giusti@srs.gov The Department of Energy (DOE), Savannah River Operations Office, will exercise an option to extend the term of the current management and operating contract with Savannah River Nuclear Solutions (SRNS) for an additional 22 months, from Oct. 1, 2016 to July

  8. Molecular beam epitaxy growth of SrO buffer layers on graphite and graphene for the integration of complex oxides

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ahmed, Adam S.; Wen, Hua; Ohta, Taisuke; Pinchuk, Igor V.; Zhu, Tiancong; Beechem, Thomas; Kawakami, Roland K.

    2016-04-27

    Here, we report the successful growth of high-quality SrO films on highly-ordered pyrolytic graphite (HOPG) and single-layer graphene by molecular beam epitaxy. The SrO layers have (001) orientation as confirmed by X-ray diffraction (XRD) while atomic force microscopy measurements show continuous pinhole-free films having rms surface roughness of <1.5 Å. Moreover, transport measurements of exfoliated graphene, after SrO deposition, show a strong dependence between the Dirac point and Sr oxidation. As a result, the SrO is leveraged as a buffer layer for more complex oxide integration via the demonstration of (001) oriented SrTiO3 grown atop a SrO/HOPG stack.

  9. Special Inquiry: OAS-SR-07-01 | Department of Energy

    Energy Savers [EERE]

    07-01 Special Inquiry: OAS-SR-07-01 November 27, 2006 Selected Controls over Classified Information at the Los Alamos National Laboratory Not Available for Viewing More Documents & ...

  10. Interrelation between Structure Magnetic Properties in La0.5Sr0...

    Office of Scientific and Technical Information (OSTI)

    Title: Interrelation between Structure Magnetic Properties in La0.5Sr0.5CoO3 Differing anisotropic strain induced from the underlying substrates not only control the long-range ...

  11. FIA-16-0018 - In the Matter of Wayne C. Brunsilius, Sr. | Department...

    Energy Savers [EERE]

    On February 16, 2016, OHA denied a FOIA Appeal filed by Wayne C. Brunsilius, Sr. (Appellant) of a determination issued by the Office of Legacy Management (OLM). In the Appeal, the ...

  12. DOE-SR Makes a Difference Through Donation to Educational Center

    Broader source: Energy.gov [DOE]

    Aiken, SC -- The Department of Energy-Savannah River Operations Office (DOE-SR) is making a real impact to increase learning resources for an educational nonprofit organization through its Computers for Learning (CFL) program.

  13. Growth control of oxygen stoichiometry in homoepitaxial SrTiO3...

    Office of Scientific and Technical Information (OSTI)

    Growth control of oxygen stoichiometry in homoepitaxial SrTiO3 films by pulsed laser epitaxy in high vacuum Prev Next Title: Growth control of oxygen stoichiometry in ...

  14. Tuning thermal conductivity in homoepitaxial SrTiO{sub 3} films via defects

    SciTech Connect (OSTI)

    Brooks, Charles M.; Wilson, Richard B.; Cahill, David G.; Schäfer, Anna; Schubert, Jürgen; Mundy, Julia A.; Holtz, Megan E.; Muller, David A.; Schlom, Darrell G.

    2015-08-03

    We demonstrate the ability to tune the thermal conductivity of homoepitaxial SrTiO{sub 3} films deposited by reactive molecular-beam epitaxy by varying growth temperature, oxidation environment, and cation stoichiometry. Both point defects and planar defects decrease the longitudinal thermal conductivity (k{sub 33}), with the greatest decrease in films of the same composition observed for films containing planar defects oriented perpendicular to the direction of heat flow. The longitudinal thermal conductivity can be modified by as much as 80%—from 11.5 W m{sup −1}K{sup −1} for stoichiometric homoepitaxial SrTiO{sub 3} to 2 W m{sup −1}K{sup −1} for strontium-rich homoepitaxial Sr{sub 1+δ}TiO{sub x} films—by incorporating (SrO){sub 2} Ruddlesden-Popper planar defects.

  15. Tuning the metal-insulator crossover and magnetism in SrRuO3...

    Office of Scientific and Technical Information (OSTI)

    in SrRuO3 by ionic gating Reversible control of charge transport and magnetic ... We report a reversible control of charge transport, metal-insulator crossover and ...

  16. Precise Measurement of Strontium-82 Radioactivity in the Sr-Rb...

    Office of Science (SC) Website

    ... Although analysis is continuing, we have the preliminary result that the medical isotope community should expect 14.93(37) -rays of 776.5 keV for every 100 atoms of 82Sr in the ...

  17. Infrared Optical Absorption in Low-spin Fe2+-doped SrTiO3 (Journal...

    Office of Scientific and Technical Information (OSTI)

    Title: Infrared Optical Absorption in Low-spin Fe2+-doped SrTiO3 Band gap engineering in ... The novel electronic states observed here offer a new avenue for band gap engineering in ...

  18. Structure symmetry determination and magnetic evolution in Sr2Ir1...

    Office of Scientific and Technical Information (OSTI)

    evolution in Sr2Ir1-xRhxO4 This content will become publicly available on November 23, 2016 Prev Next Title: Structure symmetry determination and magnetic evolution in ...

  19. Infrared optical absorption in low-spin Fe 2+ -doped SrTiO 3...

    Office of Scientific and Technical Information (OSTI)

    This content will become publicly available on January 6, 2017 Title: Infrared optical absorption in low-spin Fe 2+ -doped SrTiO 3 Authors: Comes, Ryan B. ; Kaspar, Tiffany C. ; ...

  20. Audit Special Inquiry: OAS-SR-10-04 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Inquiry: OAS-SR-10-04 Audit Special Inquiry: OAS-SR-10-04 September 22, 2010 Special Inquiry: Review of Allegations Regarding Hiring and Contracting in the Office of Energy Efficiency and Renewable Energy In April 2010, the Office of Inspector General (OIG) began receiving allegations concerning hiring and contracting practices within the Office of Energy Efficiency and Renewable Energy (EERE). These allegations included: 1. Improprieties in the hiring of a contract employee to a senior Federal

  1. Enhanced Superconducting Gaps in Trilayer High-Temperature Bi (2) Sr (2) Ca

    Office of Scientific and Technical Information (OSTI)

    (2) Cu (3) O (10+delta) Cuprate Superconductor (Journal Article) | SciTech Connect Enhanced Superconducting Gaps in Trilayer High-Temperature Bi (2) Sr (2) Ca (2) Cu (3) O (10+delta) Cuprate Superconductor Citation Details In-Document Search Title: Enhanced Superconducting Gaps in Trilayer High-Temperature Bi (2) Sr (2) Ca (2) Cu (3) O (10+delta) Cuprate Superconductor Authors: Ideta, S ; Takashima, K. ; Hashimoto, M. ; Yoshida, T. ; Fujimori, A. ; Anzai, H. ; Fujita, T. ; Nakashima, Y. ;

  2. Special Review: OAI-SR-16-01 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    OAI-SR-16-01 Special Review: OAI-SR-16-01 February 18, 2016 Allegations Regarding the Sandia National Laboratories Mixed Waste Landfill Since December 2014, the Office of Inspector General has received multiple allegations and information regarding human health and environmental protection issues due to the waste stored in the Sandia National Laboratories (SNL) Mixed Waste Landfill (MWL). For example, it was alleged that the inventory of the MWL was not complete and that contaminants from the

  3. The effect of replacement of Sr by Ca on the structural and luminescence properties of the red-emitting Sr{sub 2}Si{sub 5}N{sub 8}:Eu{sup 2+} LED conversion phosphor

    SciTech Connect (OSTI)

    Li, Y.Q.; With, G. de; Hintzen, H.T.

    2008-03-15

    The influence of the replacement of Sr by Ca on structural and luminescence properties of Eu{sup 2+}-doped Sr{sub 2}Si{sub 5}N{sub 8} is reported. The Rietveld refinement of the powder X-ray diffraction data shows that the Ca{sup 2+} ion preferentially occupies the larger Sr site in Sr{sub 2}Si{sub 5}N{sub 8}:Eu{sup 2+}. Although the excitation spectrum is hardly modified, the position of the emission band of Eu{sup 2+} can be tailored through partial replacement of Sr by Ca in Sr{sub 2}Si{sub 5}N{sub 8}:Eu{sup 2+}, resulting in red-emission shifting from 620 to 643 nm. Furthermore, (Sr, Ca){sub 2}Si{sub 5}N{sub 8}:Eu{sup 2+} shows high potential as a conversion phosphor for white-light LED applications due to similar absorption, conversion efficiency and thermal quenching behaviour for 465 nm excitation after the introduction of the Ca ion. - Graphical abstract: The temperature dependence of the luminescence efficiency of M{sub 1.9}Eu{sub 0.1}Si{sub 5}N{sub 8} (M=Ca, Sr, Ba) and Sr{sub 1.3}Ca{sub 0.6}Eu{sub 0.1}Si{sub 5}N{sub 8} ({lambda}{sub exc}=465 nm)

  4. X-ray nano-diffraction study of Sr intermetallic phase during solidification of Al-Si hypoeutectic alloy

    SciTech Connect (OSTI)

    Manickaraj, Jeyakumar; Gorny, Anton; Shankar, Sumanth, E-mail: shankar@mcmaster.ca [Light Metal Casting Research Centre (LMCRC), Department of Mechanical Engineering, McMaster University, 1280 Main Street W, Hamilton, Ontario L8S 4L7 (Canada); Cai, Zhonghou [Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)

    2014-02-17

    The evolution of strontium (Sr) containing intermetallic phase in the eutectic reaction of Sr-modified Al-Si hypoeutectic alloy was studied with high energy synchrotron beam source for nano-diffraction experiments and x-ray fluorescence elemental mapping. Contrary to popular belief, Sr does not seem to interfere with the Twin Plane Re-entrant Edge (TPRE) growth mechanism of eutectic Si, but evolves as the Al{sub 2}Si{sub 2}Sr phase during the eutectic reaction at the boundary between the eutectic Si and Al grains.

  5. Influence of rare earth doping on thermoelectric properties of SrTiO{sub 3} ceramics

    SciTech Connect (OSTI)

    Liu, J. Wang, C. L.; Li, Y.; Su, W. B.; Zhu, Y. H.; Li, J. C.; Mei, L. M.

    2013-12-14

    Thermoelectric properties of SrTiO{sub 3} ceramics, doped with different rare earth elements, were investigated in this work. It's found that the ionic radius of doping elements plays an important role on thermoelectric properties: SrTiO{sub 3} ceramics doped with large rare earth ions (such as La, Nd, and Sm) exhibit large power factors, and those doped with small ions (such as Gd, Dy, Er, and Y) exhibit low thermal conductivities. Therefore, a simple approach for enhancing the thermoelectric performance of SrTiO{sub 3} ceramics is proposed: mainly doped with large ions to obtain a large power factor and, simultaneously, slightly co-doped with small ions to obtain a low thermal conductivity. Based on this rule, Sr{sub 0.8}La{sub 0.18}Yb{sub 0.02}TiO{sub 3} ceramics were prepared, whose ZT value at 1 023 K reaches 0.31, increasing by a factor of 19% compared with the single-doped counterpart Sr{sub 0.8}La{sub 0.2}TiO{sub 3} (ZT = 0.26)

  6. DOE Spent Nuclear Fuel Information in Support of TSPA-SR

    SciTech Connect (OSTI)

    H. H. Loo

    1999-08-01

    The Department of Energy (DOE) Office of Civilian Radioactive Waste Management (RW) has started the recommendation (SR) effort to show that Yucca Mountain could be selected as the first geologic repository for spent nuclear fuel (SNF) and high-level waste. One component of the site recommendation will be a total system performance assessment (TSPA), based on the design concept and the scientific data and analysis available, describing the repository's probable behavior relative to the overall system performance standards. Thus, all the data collected from the Exploratory Studies Facilities to-date have been incorporated into the latest TSPA model. To ensure that the DOE-owned SNF continues to be acceptable for disposal in the repository, it will be included in the TSPA-SR evaluation. A number of parameters are needed in the TSPA-SR models to predict the performance of the DOE-owned SNF materials placed into the potential repository. This report documents all of the basis and/or derivation for each of these parameters. A number of properties were not readily available at the time the TSPA-SR data were requested. Thus, expert judgement and opinion were used to determine a best property value. The performance of the DOE-owned SNF will be published as part of the TSPA-SR report.

  7. Room-temperature ferroelectricity of SrTiO{sub 3} films modulated by cation concentration

    SciTech Connect (OSTI)

    Yang, Fang; Zhang, Qinghua; Yang, Zhenzhong; Gu, Junxing; Liang, Yan; Li, Wentao; Wang, Weihua; Jin, Kuijuan; Gu, Lin; Guo, Jiandong

    2015-08-24

    The room-temperature ferroelectricity of SrTiO{sub 3} is promising for oxide electronic devices controlled by multiple fields. An effective way to control the ferroelectricity is highly demanded. Here, we show that the off-centered antisite-like defects in SrTiO{sub 3} films epitaxially grown on Si (001) play the determinative role in the emergence of room-temperature ferroelectricity. The density of these defects changes with the film cation concentration sensitively, resulting in a varied coercive field of the ferroelectric behavior. Consequently, the room-temperature ferroelectricity of SrTiO{sub 3} films can be effectively modulated by tuning the temperature of metal sources during the molecular beam epitaxy growth. Such an easy and reliable modulation of the ferroelectricity enables the flexible engineering of multifunctional oxide electronic devices.

  8. Amphoteric doping of praseodymium Pr3+ in SrTiO3 grain boundaries

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Yang, H.; Lee, H. S.; Kotula, P. G.; Sato, Y.; Ikuhara, Y.; Browning, N. D.

    2015-03-26

    Charge Compensation in rare-earth Praseodymium (Pr3+) doped SrTiO3 plays an important role in determining the overall photoluminescence properties of the system. Here, the Pr3+ doping behavior in SrTiO3 grain boundaries (GBs) is analyzed using aberration corrected scanning transmission electron microscopy (STEM). The presence of Pr3+ induces structure variations and changes the statistical prevalence of GB structures. In contrast to the assumption that Pr3+ substitutes for A site as expected in the bulk, Pr3+ is found to substitute both Sr and Ti sites inside GBs with the highest concentration in the Ti sites. As a result, this amphoteric doping behavior inmore » the boundary plane is further confirmed by first principles theoretical calculations.« less

  9. Highly conducting SrMoO{sub 3} thin films for microwave applications

    SciTech Connect (OSTI)

    Radetinac, Aldin Mani, Arzhang; Ziegler, Jürgen; Alff, Lambert; Komissinskiy, Philipp; Melnyk, Sergiy; Nikfalazar, Mohammad; Zheng, Yuliang; Jakoby, Rolf

    2014-09-15

    We have measured the microwave resistance of highly conducting perovskite oxide SrMoO{sub 3} thin film coplanar waveguides. The epitaxial SrMoO{sub 3} thin films were grown by pulsed laser deposition and showed low mosaicity and smooth surfaces with a root mean square roughness below 0.3 nm. Layer-by-layer growth could be achieved for film thicknesses up to 400 nm as monitored by reflection high-energy electron diffraction and confirmed by X-ray diffraction. We obtained a constant microwave resistivity of 29 μΩ·cm between 0.1 and 20 GHz by refining the frequency dependence of the transmission coefficients. Our result shows that SrMoO{sub 3} is a viable candidate as a highly conducting electrode material for all-oxide microwave electronic devices.

  10. Molecular beam epitaxy of SrTiO{sub 3} with a growth window

    SciTech Connect (OSTI)

    Jalan, Bharat; Moetakef, Pouya; Stemmer, Susanne

    2009-07-20

    Many complex oxides with only nonvolatile constituents do not have a wide growth window in conventional molecular beam epitaxy (MBE) approaches, which makes it difficult to obtain stoichiometric films. Here it is shown that a growth window in which the stoichiometry is self-regulating can be achieved for SrTiO{sub 3} films by using a hybrid MBE approach that uses a volatile metal-organic source for Ti, titanium tetra isopropoxide (TTIP). The growth window widens and shifts to higher TTIP/Sr flux ratios with increasing temperature, showing that it is related to the desorption of the volatile TTIP. We demonstrate stoichiometric, highly perfect, insulating SrTiO{sub 3} films. The approach can be adapted for the growth of other complex oxides that previously were believed to have no wide MBE growth window.

  11. Amphoteric doping of praseodymium Pr3+ in SrTiO3 grain boundaries

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Yang, H.; Lee, H. S.; Kotula, P. G.; Sato, Y.; Ikuhara, Y.; Browning, N. D.

    2015-03-26

    Charge Compensation in rare-earth Praseodymium (Pr3+) doped SrTiO3 plays an important role in determining the overall photoluminescence properties of the system. Here, the Pr3+ doping behavior in SrTiO3 grain boundaries (GBs) is analyzed using aberration corrected scanning transmission electron microscopy (STEM). The presence of Pr3+ induces structure variations and changes the statistical prevalence of GB structures. In contrast to the assumption that Pr3+ substitutes for A site as expected in the bulk, Pr3+ is found to substitute both Sr and Ti sites inside GBs with the highest concentration in the Ti sites. As a result, this amphoteric doping behavior inmore »the boundary plane is further confirmed by first principles theoretical calculations.« less

  12. Dielectric response of metal/SrTiO{sub 3}/two-dimensional electron liquid heterostructures

    SciTech Connect (OSTI)

    Mikheev, Evgeny; Raghavan, Santosh; Stemmer, Susanne

    2015-08-17

    Maximizing the effective dielectric constant of the gate dielectric stack is important for electrostatically controlling high carrier densities inherent to strongly correlated materials. SrTiO{sub 3} is uniquely suited for this purpose, given its extremely high dielectric constant, which can reach 10{sup 4}. Here, we present a systematic study of the thickness dependence of the dielectric response and leakage of SrTiO{sub 3} that is incorporated into a vertical structure on a high-carrier-density two-dimensional electron liquid (2DEL). A simple model can be used to interpret the data. The results show a need for improved interface control in the design of metal/SrTiO{sub 3}/2DEL devices.

  13. Three-dimensional optical lattice clock with bosonic {sup 88}Sr atoms

    SciTech Connect (OSTI)

    Akatsuka, Tomoya; Takamoto, Masao; Katori, Hidetoshi

    2010-02-15

    We present detailed analyses of our recent experiment on the three-dimensional (3D) optical lattice clock with bosonic {sup 88}Sr atoms in which the collisional frequency shift was suppressed by applying a single-occupancy lattice. Frequency shifts in magnetically induced spectroscopy on the {sup 1}S{sub 0}-{sup 3}P{sub 0} clock transition ({lambda}=698 nm) of {sup 88}Sr were experimentally investigated by referencing a one-dimensional (1D) lattice clock based on spin-polarized {sup 87}Sr atoms. We discuss that the clock stability is limited by the current laser stability as well as the experimental sequence of the clock operation, which may be improved to {sigma}{sub y}({tau})=2x10{sup -16}/{radical}({tau}) by optimizing the cycle time of the clock operation.

  14. Synthesis of highly phase pure (Bi, Pb)-Sr-Ca-Cu-O superconductor

    DOE Patents [OSTI]

    Dorris, Stephen E.; Poeppel, Roger B.; Prorok, Barton C.; Lanagan, Michael T.; Maroni, Victor A.

    1994-01-01

    An article and method of manufacture of (Bi,Pb)-Sr-Ca-Cu-O superconductor. The superconductor is manufactured by preparing a first powdered mixture of bismuth oxide, lead oxide, strontium carbonate, calcium carbonate and copper oxide. A second powdered mixture is then prepared of strontium carbonate, calcium carbonate and copper oxide. The mixtures are calcined separately with the two mixtures then combined. The resulting combined mixture is then subjected to a powder in tube deformation and thermal processing to produce a substantially phase pure (Bi,Pb)-Sr-Ca-Cu-O superconductor.

  15. Synthesis of highly phase pure (Bi, Pb)-Sr-Ca-Cu-O superconductor

    DOE Patents [OSTI]

    Dorris, S.E.; Poeppel, R.B.; Prorok, B.C.; Lanagan, M.T.; Maroni, V.A.

    1994-10-11

    An article and method of manufacture of (Bi,Pb)-Sr-Ca-Cu-O superconductor are disclosed. The superconductor is manufactured by preparing a first powdered mixture of bismuth oxide, lead oxide, strontium carbonate, calcium carbonate and copper oxide. A second powdered mixture is then prepared of strontium carbonate, calcium carbonate and copper oxide. The mixtures are calcined separately with the two mixtures then combined. The resulting combined mixture is then subjected to a powder in tube deformation and thermal processing to produce a substantially phase pure (Bi,Pb)-Sr-Ca-Cu-O superconductor. 5 figs.

  16. SPECTROPOLARIMETRY OF THE TYPE Ia SN 2007sr TWO MONTHS AFTER MAXIMUM LIGHT

    SciTech Connect (OSTI)

    Zelaya, P.; Quinn, J. R.; Clocchiatti, A.; Baade, D.; Patat, F.; Hoeflich, P.; Maund, J.; Wang, L.; Wheeler, J. C.

    2013-02-01

    We present late-time spectropolarimetric observations of SN 2007sr, obtained with the Very Large Telescope at the ESO Paranal Observatory when the object was 63 days after maximum light. The late-time spectrum displays strong line polarization in the Ca II absorption features. SN 2007sr adds to the case of some normal Type Ia supernovae that show high line polarization or repolarization at late times, a fact that might be connected with the presence of high-velocity features at early times.

  17. Enhancing the Electron Mobility via Delta-Doping in SrTiO3

    SciTech Connect (OSTI)

    Kozuka, Y.

    2011-08-11

    We fabricated high-mobility {delta}-doped structures in SrTiO{sub 3} thin films in order to investigate the low temperature electronic transport properties of confined carriers in this system. An enhancement of the electron mobility above the bulk value was observed as the doped layer thickness decreased. High-field Hall measurements revealed that this mobility enhancement originates from higher-mobility electrons in the undoped clean regions, which have quantum-mechanically broadened from the doped layer. Because of the absence of apparent lattice misfit between the layers, this structure is highly suitable for investigating two-dimensional electron gases in SrTiO{sub 3}

  18. Growth of <001> TGCC crystals by Sankaranarayanan–Ramasamy (SR) method and its characterization

    SciTech Connect (OSTI)

    Boopathi, K.; Ramasamy, P.

    2015-06-24

    Single crystals of tris (glycine) Calcium (II) dichloride (TGCC) were successfully grown by Sankaranarayanan-Ramasamy (SR) method and conventional slow evaporation solution technique which have the sizes of 40 mm in length, 20 mm in diameter and 10×10×3 mm{sup 3} respectively. The grown TGCC crystals have been subjected to single crystal X-ray diffraction, UV-Vis NIR studies, Vickers micro hardness analysis, laser damage and SHG analysis. The transmittance of the grown crystal was analyzed by recording UV-Vis-NIR analysis. Mechanical strength of the SR method grown crystals was higher than the conventional method grown crystal.

  19. U. S. Department of Energy Savannah River Operations Office - DOE-SR News

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Releases DOE-SR Employee Headcount by County of Residence Per Quarter DOE-SR Headcount By County of Residence Per Quarter 3rd Quarter FY 2016 Adobe Acrobat PDF 2nd Quarter FY 2016 -- unavailable 1st Quarter FY 2016 Adobe Acrobat PDF 4th Quarter FY 2015 Adobe Acrobat PDF 3rd Quarter FY 2015 Adobe Acrobat PDF 2nd Quarter FY 2015 Adobe Acrobat PDF 1st Quarter FY 2015 Adobe Acrobat PDF 4th Quarter FY 2014 Adobe Acrobat PDF 3rd Quarter FY 2014 Adobe Acrobat PDF 2nd Quarter FY 2014 Adobe Acrobat

  20. Tunable synthesis of TiO{sub 2}/SrO core/shell nanowire arrays with enhanced photocatalytic activity

    SciTech Connect (OSTI)

    Wang, Wenqi; Yang, Jie; Gong, Yingpeng; Hong, Hanlie

    2013-01-15

    Graphical abstract: TiO{sub 2} nanowires with tunable SrO shell layer are easily fabricated. The core/shell structure can enhance the photocatalytic activity of TiO{sub 2} nanowires and restrict the recombination of the electrons/holes. Display Omitted Highlights: ? A facile method to fabricate TiO{sub 2}/SrO core-shell nanowire array is reported. ? The thickness of SrO shell layer can be tunable by adjusting the dipping time. ? TiO{sub 2}/SrO core/shell nanowires shows enhanced photocatalytic activity. -- Abstract: We report a simple method to fabricate well-aligned TiO{sub 2}/SrO core/shell nanowire arrays. The core/shell structure is confirmed to have crystalline TiO{sub 2} nanowires core and amorphous SrO shell layer. The shell is composed of SrO with tunable thickness. Photocatalytic activity measurement shows that TiO{sub 2}/SrO core/shell nanowire arrays outperform uncovered TiO{sub 2} nanowires. Such core/shell nanowire arrays have potential applications for photovoltaic devices and as high performance photocatalyst.

  1. Interfacial dislocations in (111) oriented (Ba0.7Sr0.3)TiO3 films on SrTiO3 single crystal

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Shen, Xuan; Yamada, Tomoaki; Lin, Ruoqian; Kamo, Takafumi; Funakubo, Hiroshi; Wu, Di; Xin, Huolin L.; Su, Dong

    2015-10-08

    In this study, we have investigated the interfacial structure of epitaxial (Ba,Sr)TiO3 films grown on (111)-oriented SrTiO3 single-crystal substrates using transmission electron microscopy (TEM) techniques. Compared with the (100) epitaxial perovskite films, we observe dominant dislocation half-loop with Burgers vectors of a<110> comprised of a misfit dislocation along <112>, and threading dislocations along <110> or <100>. The misfit dislocation with Burgers vector of a <110> can dissociate into two ½ a <110> partial dislocations and one stacking fault. We found the dislocation reactions occur not only between misfit dislocations, but also between threading dislocations. Via three-dimensional electron tomography, we retrievedmore » the configurations of the threading dislocation reactions. The reactions between threading dislocations lead to a more efficient strain relaxation than do the misfit dislocations alone in the near-interface region of the (111)-oriented (Ba0.7Sr0.3)TiO3 films.« less

  2. High-pressure densified solid solutions of alkaline earth hexaborides (Ca/Sr, Ca/Ba, Sr/Ba) and their high-temperature thermoelectric properties

    SciTech Connect (OSTI)

    Gürsoy, M.; Takeda, M.; Albert, B.

    2015-01-15

    Solid solutions of alkaline earth hexaborides were synthesized and densified by spark plasma sintering at 100 MPa. The high-temperature thermoelectric properties (Seebeck coefficients, electrical and thermal diffusivities, heat capacities) were measured between room temperature and 1073 K. CaB{sub 6}, SrB{sub 6}, BaB{sub 6} and the ternary hexaborides Ca{sub x}Sr{sub 1−x}B{sub 6}, Ca{sub x}Ba{sub 1−x}B{sub 6}, Sr{sub x}Ba{sub 1−x}B{sub 6} (x = 0.25, 0.5, 0.75) are n-type conducting compounds over the whole compositional and thermal ranges. The values of the figure of merit ZT for CaB{sub 6} (ca. 0.3 at 1073 K) were found to be significantly increased compared to earlier investigations which is attributed to the densification process. - Highlights: • Solid solutions of alkaline earth hexaborides were synthesized. • High-temperature thermoelectric properties of mixed calcium borides are excellent. • Spark plasma source densification results in high ZT values. • Borides are rare-earth free and refractory materials.

  3. Design of highly ordered Ag-SrTiO{sub 3} nanotube arrays for photocatalytic degradation of methyl orange

    SciTech Connect (OSTI)

    Sun Yue; Liu Jiawen; Li Zhonghua

    2011-08-15

    Ag-SrTiO{sub 3} nanotube arrays were successfully prepared for the degradation of methyl orange (MO) under ultraviolet irradiation. In order to form highly ordered SrTiO{sub 3} nanotube arrays, the preparation of TiO{sub 2} nanotube arrays by anodic oxidation of titanium foil in different electrolytes was investigated. The selected organic solvents in electrolytes include glycerol, dimethyl sulfoxide and glycol. The results indicate that the morphology of TiO{sub 2} nanotube arrays prepared in glycol containing ammonium fluoride electrolyte is more regular. Then SrTiO{sub 3} nanotube arrays were synthesized by a hydrothermal method using TiO{sub 2} nanotube arrays as the precursor. In order to further improve the photocatalytic activity of SrTiO{sub 3} nanotube arrays, Ag nanoparticles were loaded on SrTiO{sub 3} nanotube arrays by two sets of experiments. The loaded Ag results in an enhancement of photocatalytic activity of SrTiO{sub 3} nanotube arrays. Moreover, the effect of pH on the photocatalytic degradation of MO was also studied. - Graphical abstract: Ag-SrTiO{sub 3} nanotube arrays were successfully prepared. The photocatalytic activity was evaluated by degradation of methyl orange under ultraviolet irradiation. Highlights: > TiO{sub 2} nanotube arrays prepared in glycol+NH{sub 4}F electrolyte are more regular. > Highly ordered Ag-SrTiO{sub 3} nanotube arrays were successfully synthesized. > Ag loading could enhance the photocatalytic activity of SrTiO{sub 3} nanotube arrays. > Ag-SrTiO{sub 3} nanotube arrays show excellent catalytic activity at a low pH value.

  4. Preparation of Bi-Sr-Ca-Cu-O superconductors from oxide-glass precursors

    DOE Patents [OSTI]

    Hinks, David G.; Capone, II, Donald W.

    1992-01-01

    A superconductor and precursor therefor from oxide mixtures of Ca, Sr, Bi and Cu. Glass precursors quenched to elevated temperatures result in glass free of crystalline precipitates having enhanced mechanical properties. Superconductors are formed from the glass precursors by heating in the presence of oxygen to a temperature below the melting point of the glass.

  5. Synthesis and Structure Determination of Ferromagnetic Semiconductors LaAMnSnO6 (A = Sr Ba)

    SciTech Connect (OSTI)

    T Yang; T Perkisas; J Hadermann; M Croft; A Ignatov; M Greenblatt

    2011-12-31

    LaAMnSnO{sub 6} (A = Sr, Ba) have been synthesized by high temperature solid-state reactions under dynamic 1% H{sub 2}/Ar flow. Rietveld refinements on room temperature powder X-ray diffraction data indicate that LaSrMnSnO{sub 6} crystallizes in the GdFeO{sub 3}-structure, with space group Pnma and, combined with transmission electron microscopy, LaBaMnSnO{sub 6} in Imma. Both space groups are common in disordered double-perovskites. The Mn{sup 3+} and Sn{sup 4+} ions whose valence states were confirmed by X-ray absorption spectroscopy, are completely disordered over the B-sites and the BO{sub 6} octahedra are slightly distorted. LaAMnSnO{sub 6} are ferromagnetic semiconductors with a T{sub C} = 83 K for the Sr- and 66 K for the Ba-compound. The title compounds, together with the previously reported LaCaMnSnO{sub 6} provide an interesting example of progression from Pnma to Imma as the tolerance factor increases. An analysis of the relationship between space group and tolerance factor for the series LaAMnMO{sub 6} (A = Ca, Sr, Ba; M = Sn, Ru) provides a better understanding of the symmetry determination for double perovskites.

  6. High antiferromagnetic transition temperature of a honeycomb compound SrRu2O6

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Tian, Wei; Svoboda, Chris; Ochi, M.; Matsuda, M.; Cao, Huibo; Cheng, J. -G.; Sales, B. C.; Mandrus, D.; Arita, R.; Trivedi, Nandini; et al

    2015-09-14

    We study the high-temperature magnetic order in a quasi-two-dimensional honeycomb compound SrRu2O6 by measuring magnetization and neutron powder diffraction with both polarized and unpolarized neutrons. SrRu2O6 crystallizes into the hexagonal lead antimonate (PbSb2O6, space group P31m) structure with layers of edge-sharing RuO6 octahedra separated by Sr2+ ions. SrRu2O6 is found to order at TN = 565 K with Ru moments coupled antiferromagnetically both in plane and out of plane. The magnetic moment is 1.30(2) μB/Ru at room temperature and is along the crystallographic c axis in the G-type magnetic structure. We perform density functional calculations with constrained random-phase approximation (RPA)more » to obtain the electronic structure and effective intra- and interorbital interaction parameters. The projected density of states shows strong hybridization between Ru 4d and O 2p. By downfolding to the target t2g bands we extract the effective magnetic Hamiltonian and perform Monte Carlo simulations to determine the transition temperature as a function of interand intraplane couplings. We find a weak interplane coupling, 3% of the strong intraplane coupling, permits three-dimensional magnetic order at the observed TN .« less

  7. Enhanced irreversibility by crystal defects in the Bi-Sr-Ca-Cu-O system

    SciTech Connect (OSTI)

    Salem-Sugui, S. Jr.; Shi, Donglu; McFarland, S.E.

    1991-04-01

    We measured magnetic irreversibility, H*(T), in liquid-quenched Bi-Sr-Ca-Cu-O samples with various microstructures at high applied field (up to 7 T). We found that H*(T) is considerably increased in the Bi{sub 2}Sr{sub 2}Ca{sub 3}Cu{sub 4}O{sub x} (2234) sample with a large amount of crystal defects, including severe lattice distortion and calcium and copper rich precipitates. We argue that the lattice distortion may affect the degree of anisotropy and the Josephson coupling between the Cu-O layers, which in turn enhance the irreversibility in the Bi-Sr-Ca-Cu-O system. A critical current density, J{sub c}, of 8 {times} 10{sup 4} A/cm{sup 2} at 8 kG and 40 K was obtained in the 2234 sample with many defects, while the J{sub c} dropped significantly at the same temperature and field in the near stoichiometry Bi{sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} (2223) sample with a uniform microstructure.

  8. Graphic presentation of quarterly /sup 90/Sr fallout data, 1954-1982

    SciTech Connect (OSTI)

    Larsen, R.J.

    1984-01-01

    This report graphically presents all of the precipitation and /sup 90/Sr deposition data for all stations operated as part of the Environmental Measurements Laboratory's (EML) global fallout program since the initiation of the program in 1954. 3 references, 179 figures.

  9. Jie Gao > Sr. Electrochemist - Spectrum Brands > Center Alumni > The Energy

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Materials Center at Cornell Jie Gao Sr. Electrochemist - Spectrum Brands jiegaocn@gmail.com Jie was a former member of the Abruña Group as a postdoc. In May 2015, he joined Spectrum Brands as an electrochemist

  10. Electronic structure of the ingredient planes of the cuprate superconductor Bi2Sr2CuO6+δ: A comparison study with Bi2Sr2CaCu2O8+δ

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Yan -Feng Lv; Gu, G. D.; Wang, Wen -Lin; Ding, Hao; Wang, Yang; Ding, Ying; Zhong, Ruidan; Schneeloch, John; Wang, Lili; He, Ke; et al

    2016-04-15

    By means of low-temperature scanning tunneling microscopy, we report on the electronic structures of the BiO and SrO planes of the Bi2Sr2CuO6+δ (Bi-2201) superconductor prepared by argon-ion bombardment and annealing. Depending on post annealing conditions, the BiO planes exhibit either a pseudogap (PG) with sharp coherence peaks and an anomalously large gap magnitude of 49 meV or van Hove singularity (vHS) near the Fermi level, while the SrO is always characteristic of a PG-like feature. This contrasts with the Bi2Sr2CaCu2O8+δ (Bi-2212) superconductor where vHS occurs solely on the SrO plane. We disclose the interstitial oxygen dopants (δ in the formulas)more » as a primary cause for the occurrence of vHS, which are located dominantly around the BiO and SrO planes, respectively, in Bi-2201 and Bi-2212. This is supported by the contrasting structural buckling amplitude of the BiO and SrO planes in the two superconductors. Furthermore, our findings provide solid evidence for the irrelevance of PG to the superconductivity in the two superconductors, as well as insights into why Bi-2212 can achieve a higher superconducting transition temperature than Bi-2201, and by implication, the mechanism of cuprate superconductivity.« less

  11. Electrostatic analysis of n-doped SrTiO{sub 3} metal-insulator-semiconductor systems

    SciTech Connect (OSTI)

    Kamerbeek, A. M. Banerjee, T.; Hueting, R. J. E.

    2015-12-14

    Electron doped SrTiO{sub 3}, a complex-oxide semiconductor, possesses novel electronic properties due to its strong temperature and electric-field dependent permittivity. Due to the high permittivity, metal/n-SrTiO{sub 3} systems show reasonably strong rectification even when SrTiO{sub 3} is degenerately doped. Our experiments show that the insertion of a sub nanometer layer of AlO{sub x} in between the metal and n-SrTiO{sub 3} interface leads to a dramatic reduction of the Schottky barrier height (from around 0.90 V to 0.25 V). This reduces the interface resistivity by 4 orders of magnitude. The derived electrostatic analysis of the metal-insulator-semiconductor (n-SrTiO{sub 3}) system is consistent with this trend. When compared with a Si based MIS system, the change is much larger and mainly governed by the high permittivity of SrTiO{sub 3}. The non-linear permittivity of n-SrTiO{sub 3} leads to unconventional properties such as a temperature dependent surface potential non-existent for semiconductors with linear permittivity such as Si. This allows tuning of the interfacial band alignment, and consequently the Schottky barrier height, in a much more drastic way than in conventional semiconductors.

  12. Development of high through-put Sr isotope analysis for monitoring reservoir integrity for CO{sub 2} storage.

    SciTech Connect (OSTI)

    Wall, Andy; Jain, Jinesh; Stewart, Brian; Capo, Rosemary; Hakala, Alexandra J.; Hammack, Richard; Guthrie, George

    2012-01-01

    Recent innovations in multi-collector ICP-mass spectrometry (MC-ICP-MS) have allowed for rapid and precise measurements of isotope ratios in geological samples. Naturally occurring Sr isotopes has the potential for use in Monitoring, Verification, and Accounting (MVA) associated with geologic CO2 storage. Sr isotopes can be useful for: Sensitive tracking of brine migration; Determining seal rock leakage; Studying fluid/rock reactions. We have optimized separation chemistry procedures that will allow operators to prepare samples for Sr isotope analysis off site using rapid, low cost methods.

  13. Crystallographic, electronic, thermal, and magnetic properties of single-crystal SrCo2As2

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Pandey, Abhishek; Quirinale, D. G.; Jayasekara, W.; Sapkota, A.; Kim, M. G.; Dhaka, R. S.; Lee, Y.; Heitmann, T. W.; Stephens, P. W.; Ogloblichev, V.; et al

    2013-07-01

    In tetragonal SrCo2As2 single crystals, inelastic neutron scattering measurements demonstrated that strong stripe-type antiferromagnetic (AFM) correlations occur at a temperature T = 5 K [W. Jayasekara et al., arXiv:1306.5174] that are the same as in the isostructural AFe2As2 (A = Ca, Sr, Ba) parent compounds of high-Tc superconductors. This surprising discovery suggests that SrCo2As2 may also be a good parent compound for high-Tc superconductivity. Here, structural and thermal expansion, electrical resistivity ρ, angle-resolved photoemission spectroscopy (ARPES), heat capacity Cp, magnetic susceptibility χ, 75As NMR and neutron diffraction measurements of SrCo2As2 crystals are reported together with LDA band structure calculations thatmore » shed further light on this fascinating material. The c-axis thermal expansion coefficient αc is negative from 7 to 300 K, whereas αa is positive over this T range. The ρ(T) shows metallic character. The ARPES measurements and band theory confirm the metallic character and in addition show the presence of a flat band near the Fermi energy EF. The band calculations exhibit an extremely sharp peak in the density of states D(EF) arising from a flat dx2-y2 band. A comparison of the Sommerfeld coefficient of the electronic specific heat with χ(T → 0) suggests the presence of strong ferromagnetic itinerant spin correlations which on the basis of the Stoner criterion predicts that SrCo2As2 should be an itinerant ferromagnet, in conflict with the magnetization data. The χ(T) does have a large magnitude, but also exhibits a broad maximum at 115 K suggestive of dynamic short-range AFM spin correlations, in agreement with the neutron scattering data. The measurements show no evidence for any type of phase transition between 1.3 and 300 K and we propose that metallic SrCo2As2 has a gapless quantum spin-liquid ground state.« less

  14. Processing & properties La{sub 1-x}A{sub x}Co{sub 1-y}Fe{sub y}O{sub 3}(A = Sr, Ca) perovskites

    SciTech Connect (OSTI)

    Stevenson, J.W.; Armstrong, T.R.; Pederson, L.R.

    1995-04-01

    Selected compositions within the system La{sub 1-x}A{sub x}Co{sub 1-y}Fe{sub y}O{sub 3-{delta}}(A = Sr, Ca) were prepared by combustion synthesis and characterized by XRD, TGA, electrical conductivity, and oxygen permeation measurements. Substantial weight loss (due to loss of lattice oxygen) was observed in some compositions at high temperatures. For Sr containing materials, this weight loss increased with increasing Sr content. A substantial decrease in electronic conductivity was observed at high temperatures in Sr doped materials; this decrease was related to the decreased oxygen stoichiometry at these temperatures. In Sr doped compositions, oxygen flux increased with increasing Sr content. Calculated values of ionic conductivity were greater than the conductivity of yttria stabilized zirconia. Substitution of Ca for Sr resulted in substantially lower fluxes.

  15. Application of {sup 87}Sr/{sup 86}Sr, {delta}{sup 18}O and {delta}{sup 13}C Isotopes to diagenesis, correlation and connectivity of a fractured chalk reservoir, the Sidi El Kilani Field Tunisia

    SciTech Connect (OSTI)

    Mearns, E.W.; Mcbride, J.J.; Bramwell, M.

    1995-08-01

    Strontium Stratigraphy Analysis of the primary matrix chalk of the Abiod Formation reservoir in the Sidi El Kilani Field indicate a Campanian to Maastrichtian age (Upper Cretaceous). A resolution of {+-}1Ma has been achieved and results suggest that there are no major stratigraphic breaks in the studied sequences. Sr-O-C isotope data from early fracture-filling calcite cements suggest they may have formed by the redistribution of CaCO{sub 3} from underlying carbonate sequences and may have precipitated at temperatures in the region of 35-55{degrees}C. The {sup 87}Sr/{sup 86}Sr isotope ratios of formation waters determined by residual salt analysis (SrRSA) suggest that the chemical evolution of waters during reservoir filling was controlled by the influx of basinal waters as opposed to in situ water-rock interaction. Late, fracture-filling dolomite and barite cements have Sr-O-C isotope characteristics consistent with precipitation from these migrating basinal fluids at temperatures similar to current reservoir conditions (70-75{degrees}C). Sr RSA results suggest that the reservoir section in two of the wells may have been in direct lateral communication at the time of oil emplacement. These wells however are separated by a strike-slip fault. The SrRSA results therefore suggest that the fault is a partial barrier which has restricted pressure equilibration in the relatively short timescale of oil production, but which may have allowed homogenization of Sr isotope ratios in formation water.

  16. Revealing the atomic and electronic structure of a SrTiO{sub 3}/LaNiO{sub 3}/SrTiO{sub 3} heterostructure interface

    SciTech Connect (OSTI)

    Zhang, Zaoli; Soltan, S.; Schmid, H.; Habermeier, H.-U.; Keimer, B.; Kaiser, U.

    2014-03-14

    The atomic structures of SrTiO{sub 3} (STO)/LaNiO{sub 3} (LNO)/STO heterostructure interfaces were investigated by spherical aberration-corrected (C{sub S}) (scanning) transmission electron microscopy. Atomic displacement and lattice distortion measurements and electron energy loss spectroscopy (EELS) were used to quantitatively analyze the distortion of the interfacial octahedra and the bond length at the interfaces. Combined with high-resolution transmission electron microscopy (HRTEM) and scanning transmission electron microscopy analyses, two distinct interfacial atomic terminating layers are unambiguously determined. Ensuing quantitative HRTEM measurements revealed that the Ni-O bond length in the interfacial octahedral is elongated at the bottom interface (NiO{sub 2}-SrO). Atomic displacement shows structural relaxation effects when crossing the interfaces and lattice distortions across the interface is more pronounced in LNO than in STO. The Ti/O atomic ratio, La and Ti relative atomic ratio as derived by EELS quantification indicate non-stoichiometric composition at the interfaces. Distinct fine structures of Ti-L{sub 2,3} edge and O-K edge at the bottom and top interfaces are observed. By comparison, we are able to estimate Ti valency at both interfaces. Combining the structural distortions and Ti valency, the polar discontinuity and charge transfer at the interfaces are discussed.

  17. Upper limit on spontaneous supercurrents in Sr2RuO4

    SciTech Connect (OSTI)

    Chung, Suk Bum

    2010-04-05

    It is widely believed that the perovskite Sr{sub 2}RuO{sub 4} is an unconventional superconductor with broken time reversal symmetry. It has been predicted that superconductors with broken time reversal symmetry should have spontaneously generated supercurrents at edges and domain walls. We have done careful imaging of the magnetic fields above Sr{sub 2}RuO{sub 4} single crystals using scanning Hall bar and SQUID microscopies, and see no evidence for such spontaneously generated supercurrents. We use the results from our magnetic imaging to place upper limits on the spontaneously generated supercurrents at edges and domain walls as a function of domain size. For a single domain, this upper limit is below the predicted signal by two orders of magnitude. We speculate on the causes and implications of the lack of large spontaneous supercurrents in this very interesting superconducting system.

  18. Thickness-dependent metal-insulator transition in epitaxial SrRuO3 ultrathin films

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Shen, Xuan; Qiu, Xiangbiao; Su, Dong; Zhou, Shengqiang; Li, Aidong; Wu, Di

    2015-01-06

    Transport characteristics of ultrathin SrRuO₃ films, deposited epitaxially on TiO₂-terminated SrTiO₃ (001) single-crystal substrates, were studied as a function of film thickness. Evolution from a metallic to an insulating behavior is observed as the film thickness decreases from 20 to 4 unit cells. In films thicker than 4 unit cells, the transport behavior obeys the Drude low temperature conductivity with quantum corrections, which can be attributed to weak localization. Fitting the data with 2-dimensional localization model indicates that electron-phonon collisions are the main inelastic relaxation mechanism. In the film of 4 unit cells in thickness, the transport behavior follows variablemore » range hopping model, indicating a strongly localized state. As a result, magnetoresistance measurements reveal a likely magnetic anisotropy with the magnetic easy axis along the out-of-plane direction.« less

  19. Structural and dielectric properties of CuO-doped SrTiO{sub 3} ceramics

    SciTech Connect (OSTI)

    Naidu, K. Chandra Babu Sarmash, T. Sofi; Maddaiah, M.; Reddy, V. Narasimha; Subbarao, T.

    2015-06-24

    Copper-doped SrTiO{sub 3} (ST) ceramic powders were processed by solid-state route diffusion (SRD) bulk preparation technique. We reported the effect of Cu{sup +2} ions on the dielectric response of ST and it established the substantial increase in dielectric constant (ε{sub r}) than undoped ST from 303K-673K and low loss (tanδ) for good dielectric applications. In respect of the electrical properties ac- activation energies were computed of range 0.089-0.319eV using lnσ Vs 1/T plots. The microstructure was examined with grain sizes 6-9µm of uniform distribution by field emission scanning electron microscope (FESEM). Some additional phases SrCu{sub 3}Ti{sub 4}O{sub 12} and TiO{sub 2} rutiles were detected by X-ray diffraction technique.

  20. Dielectric relaxation and conduction in SrTiO{sub 3} thin films under dc bias

    SciTech Connect (OSTI)

    Ang, Chen; Yu, Zhi; Cross, L. E.; Guo, Ruyan; Bhalla, A. S.

    2001-08-06

    The dielectric and conduction behavior of SrTiO{sub 3} thin films deposited on a SrTiO{sub 3} single-crystal substrate is studied. Without dc bias, an obvious dielectric 'defect mode' in the dielectric loss is observed in the temperature range of {approx}100--200 K; however, no noticeable corresponding dielectric constant peak is observed. By applying a high dc bias ({>=}40 kV/cm), a dielectric constant peak with frequency dispersion appears in the same temperature range, the dielectric loss is increased, and simultaneously high dc conduction is observed. The induced dielectric constant peak is related to dc conduction and attributed to the coupling effect of the mobile carriers with the dielectric defect mode. {copyright} 2001 American Institute of Physics.

  1. Thickness-dependent metal-insulator transition in epitaxial SrRuO? ultrathin films

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Shen, Xuan; Qiu, Xiangbiao; Su, Dong; Zhou, Shengqiang; Li., Aidong; Wu, Di

    2015-01-06

    Transport characteristics of ultrathin SrRuO? films, deposited epitaxially on TiO?-terminated SrTiO? (001) single-crystal substrates, were studied as a function of film thickness. Evolution from a metallic to an insulating behavior is observed as the film thickness decreases from 20 to 4 unit cells. In films thicker than 4 unit cells, the transport behavior obeys the Drude low temperature conductivity with quantum corrections, which can be attributed to weak localization. Fitting the data with 2-dimensional localization model indicates that electron-phonon collisions are the main inelastic relaxation mechanism. In the film of 4 unit cells in thickness, the transport behavior follows variablemorerange hopping model, indicating a strongly localized state. Magnetoresistance measurements reveal a likely magnetic anisotropy with the magnetic easy axis along the out-of-plane direction.less

  2. Effect of {alpha} variation on the vibrational spectrum of Sr{sub 2}

    SciTech Connect (OSTI)

    Beloy, K.; Hauser, A. W.; Borschevsky, A.; Schwerdtfeger, P.; Flambaum, V. V.

    2011-12-15

    We consider the effect of {alpha} variation on the vibrational spectrum of Sr{sub 2} in the context of a planned experiment to test the stability of {mu}{identical_to}m{sub e}/m{sub p} using optically trapped Sr{sub 2} molecules [Zelevinsky et al., Phys. Rev. Lett. 100, 043201 (2008); Kotochigova et al., Phys. Rev. A 79, 012504 (2009)]. We find the prospective experiment to be 3 to 4 times less sensitive to fractional variation in {alpha} as it is to fractional variation in {mu}. Depending on the precision ultimately achieved by the experiment, this result may give justification for the neglect of {alpha} variation or, alternatively, may call for its explicit consideration in the interpretation of experimental results.

  3. Oxygen vacancies at the surface of SrTiO{sub 3} thin films

    SciTech Connect (OSTI)

    Silva, Alexandre R.; Dalpian, Gustavo M.

    2014-01-21

    The two-dimensional electron gas (2DEG) observed at the surface of oxide thin films and at the interface between two oxides has been widely discussed, but the mechanism responsible for this behavior is still not well understood. In this work, we study the properties of the SrTiO{sub 3} (001) surface and show that defects are necessary in order to explain this 2DEG. We study the properties of oxygen vacancies at the TiO{sub 2} and SrO terminated surface, and conclude they can explain the metallic behavior experimentally observed. There is a strong tendency for these vacancies to be localized at the surface, where the formation energy is less than 2.92?eV.

  4. Defects and persistent conductivity in SrTiO{sub 3}

    SciTech Connect (OSTI)

    McCluskey, Matthew D.; Tarun, Marianne C.

    2014-02-21

    Strontium titanate (SrTiO{sub 3}) is often used as a substrate for oxide thin films such as high-temperature superconductors. It has the perovskite structure and an indirect band gap of 3.25 eV. Our prior work showed that hydrogen impurities form a defect complex that contains two hydrogen atoms. The complex was tentatively attributed to a passivated strontium vacancy. Alternatively, it could be a partially passivated titanium vacancy. In order to create titanium vacancies, we annealed samples in an evacuated ampoule with SrO powder. These samples show unexpected behavior. After illuminating with sub-gap light, the free-electron concentration increases significantly. After the light is turned off, the high conductivity persists at room temperature. We attribute persistent photoconductivity (PPC) to the excitation of an electron from a vacancy into the conduction band, with a low recapture rate.

  5. Effective activation energy in the Bi-Sr-Ca-Cu-O systems

    SciTech Connect (OSTI)

    Sengupta, S.; Shi, D.; Wang, Z.; Smith, M.; McGinn, P.J.

    1992-08-01

    Magnetic relaxation in the Bi-Sr-Ca-Cu-O systems has been investigated in a wide temperature regime. Previously reported studies of the effective activation energy, U, have been controversial in terms of temperature and field dependence of the critical current density, j{sub c}. We have considered the temperature dependence of j{sub c} and constructed the U-j (or M) curves for the Bi-Sr-Ca-Cu-O system. We found that at a constant driving force and temperature, U is considerably higher for 2245 samples than for 2223 samples. This enhancement can be attributed to the flux pinning from finely dispersed calcium- and copper- rich precipitates.

  6. Effective activation energy in the Bi-Sr-Ca-Cu-O systems

    SciTech Connect (OSTI)

    Sengupta, S.; Shi, D.; Wang, Z.; Smith, M. ); McGinn, P.J. . Dept. of Electrical Engineering)

    1992-08-01

    Magnetic relaxation in the Bi-Sr-Ca-Cu-O systems has been investigated in a wide temperature regime. Previously reported studies of the effective activation energy, U, have been controversial in terms of temperature and field dependence of the critical current density, j[sub c]. We have considered the temperature dependence of j[sub c] and constructed the U-j (or M) curves for the Bi-Sr-Ca-Cu-O system. We found that at a constant driving force and temperature, U is considerably higher for 2245 samples than for 2223 samples. This enhancement can be attributed to the flux pinning from finely dispersed calcium- and copper- rich precipitates.

  7. High-Accuracy Optical Clock via Three-Level Coherence in Neutral Bosonic {sup 88}Sr

    SciTech Connect (OSTI)

    Santra, Robin; Arimondo, Ennio; Ido, Tetsuya; Greene, Chris H.; Ye, Jun

    2005-05-06

    An optical atomic clock scheme is proposed that utilizes two lasers to establish coherent coupling between the 5s{sup 2} {sup 1}S{sub 0} ground state of {sup 88}Sr and the first excited state, 5s5p {sup 3}P{sub 0}. The coupling is mediated by the broad 5s5p {sup 1}P{sub 1} state, exploiting the phenomenon of electromagnetically induced transparency. The effective linewidth of the clock transition can be chosen at will by adjusting the laser intensity. By trapping the {sup 88}Sr atoms in an optical lattice, long interaction times with the two lasers are ensured; Doppler and recoil effects are eliminated. Based on a careful analysis of systematic errors, a clock accuracy of better than 2x10{sup -17} is expected.

  8. Electronic and magnetic properties of epitaxial perovskite SrCrO3(001)

    SciTech Connect (OSTI)

    Zhang, Hongliang; Du, Yingge; Sushko, Petr; Bowden, Mark E.; Shutthanandan, V.; Qiao, Liang; Cao, Guixin; Gai, Zheng; Sallis, Shawn; Piper, L.F.J.; Chambers, Scott A.

    2015-06-24

    We have investigated the intrinsic properties of SrCrO3 epitaxial thin films synthesized by molecular beam epitaxy. We find compelling evidence that SrCrO3 is a correlated metal. X-ray photoemission valence band and O K-edge x-ray absorption spectra indicate a strongly hybridized Cr3d-O2p state crossing the Fermi level, leading to metallic behavior. Comparison between valence band spectra near the Fermi level and the densities of states calculated using density functional theory (DFT) also suggests the presence of coherent and incoherent states and points to a strong electron-electron correlation effects. The magnetic susceptibility can be described by Pauli paramagnetism at temperatures above 100 K, but reveals antiferromagnetic behavior at lower temperatures resulting from orbital ordering as suggested by Ortega-San-Martin et al. [Phys. Rev. Lett. 99, 255701 (2007)].

  9. Structural and magnetic properties of the 5d2 double perovskites Sr2BReO6 (B = Y, In)

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Aczel, A. A.; Zhao, Z.; Calder, S.; Adroja, D. T.; Baker, P. J.; Yan, J. -Q.

    2016-06-01

    With this study, we have performed magnetic susceptibility, heat capacity, neutron powder diffraction, and muon spin relaxation experiments to investigate the magnetic ground states of the 5$d^2$ double perovskites Sr$_2$YReO$_6$ and Sr$_2$InReO$_6$. We find that Sr$_2$YReO$_6$ is a spin glass, while Sr$_2$InReO$_6$ hosts a non-magnetic singlet state. By making detailed comparisons with other 5$d^2$ double perovskites, we argue that a delicate interplay between spin-orbit coupling, non-cubic crystal fields, and exchange interactions plays a key role in the great variation of magnetic ground states observed for this family of materials.

  10. Electronic phase diagram of epitaxial La{sub 1?x}Sr{sub x}FeO{sub 3} films

    SciTech Connect (OSTI)

    Xie, Y. J.; Scafetta, M. D.; Moon, E. J.; Krick, A. L.; Sichel-Tissot, R. J.; May, S. J.

    2014-08-11

    The electronic phase diagram of epitaxial La{sub 1?x}Sr{sub x}FeO{sub 3} films is presented. The films were grown on SrTiO{sub 3} using molecular beam epitaxy with post-growth annealing to minimize oxygen vacancies. Insulating behavior is observed from x?=?00.9, with metallic conduction only present for x?=?1.0. While the La-rich compounds exhibit polaron conduction over all temperatures measured, the Sr-rich films exhibit an electronic phase transition within the compositional window of x?=?0.490.9 as revealed by temperature-dependent resistivity measurements. The transition temperatures are found to decrease with increasing Sr content. The constructed phase diagram is discussed in the context of other 3d e{sub g} perovskite systems including manganites and cobaltites.

  11. Electronic structure of a superconducting topological insulator Sr-doped Bi{sub 2}Se{sub 3}

    SciTech Connect (OSTI)

    Han, C. Q.; Chen, W. J.; Zhu, Fengfeng; Yao, Meng-Yu; Li, H.; Li, Z. J.; Wang, M.; Gao, Bo F.; Guan, D. D.; Liu, Canhua; Qian, Dong Jia, Jin-Feng; Gao, C. L.

    2015-10-26

    Using high-resolution angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy, the atomic and low energy electronic structure of the Sr-doped superconducting topological insulators (Sr{sub x}Bi{sub 2}Se{sub 3}) was studied. Scanning tunneling microscopy shows that most of the Sr atoms are not in the van der Waals gap. After Sr doping, the Fermi level was found to move further upwards when compared with the parent compound Bi{sub 2}Se{sub 3}, which is consistent with the low carrier density in this system. The topological surface state was clearly observed, and the position of the Dirac point was determined in all doped samples. The surface state is well separated from the bulk conduction bands in the momentum space. The persistence of separated topological surface state combined with small Fermi energy makes this superconducting material a very promising candidate for the time reversal invariant topological superconductor.

  12. Spin-dependent transport across Co/LaAlO{sub 3}/SrTiO{sub 3} heterojunctions

    SciTech Connect (OSTI)

    Swartz, Adrian G.; Harashima, Satoshi; Xie, Yanwu; Kim, Bongju; Hwang, Harold Y.; Lu, Di; Bell, Christopher; Hikita, Yasuyuki

    2014-07-21

    The conducting interface formed between LaAlO{sub 3} and SrTiO{sub 3} exhibits high electron mobility, tunable carrier densities, and is theoretically predicted to have long spin lifetimes. Thus, the LaAlO{sub 3}/SrTiO{sub 3} heterostructure is a promising system for the transportation of spin information. We have investigated spin-dependent transport across Co/LaAlO{sub 3}/SrTiO{sub 3} heterostructures using an all electrical three terminal geometry and observed Lorentzian magnetoresistance typically associated with Hanle spin dephasing. However, such a picture fails to explain all the experimentally observed behavior. Further, experiments with spin-unpolarized Au/LaAlO{sub 3}/SrTiO{sub 3} heterojunctions support an alternative scenario involving current modulation by spin-dependent transport through defect states in the LaAlO{sub 3} barrier.

  13. Photoconductivity and Non-Exponential Relaxation at Insulating LaAlO3/SrTiO3 Interfaces

    SciTech Connect (OSTI)

    Kim, Minu; Bell, C.; Hikita, Y.; Kozuka, Y.; Kim, B.G.; Hwang, H.Y.

    2012-08-17

    LaAlO{sub 3} is grown on SrO terminated (100) SrTiO{sub 3}, and (110) SrTiO{sub 3}, producing insulating heterointerfaces without light. Photocurrent spectroscopy at low temperatures reveals a broad distribution of interface states between 2 eV and 2.7 eV at both interfaces, with a higher density in the (110) case concomitant with relatively shallow traps. The photocurrent relaxation can be well fitted by a stretched exponential form, confirming energetically distributed electron traps. Photo-carrier lifetimes are larger than a few hundred seconds for optical excitation approaching the SrTiO{sub 3} band-gap energy, providing the opportunity to study transient light-induced properties at low temperatures.

  14. Carbon dioxide, hydrographic, and chemical data obtained during the R/Vs Roger Revelle and Thomas Thompson repeat hydrography cruises in the Pacific Ocean: CLIVAR CO2 sections P16S-2005 (9 January - 19 February, 2005) and P16N-2006 (13 February - 30 March, 2006)

    SciTech Connect (OSTI)

    Kozyr, Alex; Feely, R. A.; Sabine, C. L.; Millero, F. J.; Langdon, C.; Dickson, A. G.; Fine, R. A.; Bullister, J. L.; Hansell, D. A.; Carlson, C. A.; Sloyan, B. M.; McNichol, A. P.; Key, R. M.; Byrne, R. H.; Wanninkhof, R.

    2009-05-01

    This report presents methods, and analytical and quality control procedures for salinity, oxygen, nutrients, total carbon dioxide (TCO2), total alkalinity (TALK), pH, discrete CO2 partial pressure (pCO2), dissolved organic carbon (DOC), chlorofluorocarbons (CFCs), radiocarbon, δ13C, and underway carbon measurements performed during the P16S-2005 (9 January - 19 February 2005) and P16N-2006 (13 February - 30 March, 2006) cruises in the Pacific Ocean. The research vessel (R/V) Roger Revelle departed Papeete, Tahiti, on January 9, 2005 for the Repeat Section P16S, nominally along 150°W, ending in Wellington, New Zealand, on February 19. During this cruise, samples were taken from 36 depths at 111 CTD stations between 16°S and 71°S. The Repeat Section P16N, nominally along 152°W, consisted of two legs. Leg 1 started on February 13, 2006 in Papeete, Tahiti, and finished on March 3, in Honolulu, Hawaii. The R/V Thomas G. Thompson departed Honolulu for Leg 2 on March 10, 2006 and arrived in Kodiak, Alaska, on March 30. During the P16N cruises, samples were taken from 34 or 36 depths at 84 stations between 17°S and 56.28°N. The research conducted on these cruises was part of a series of repeat hydrography sections jointly funded by the National Oceanic and Atmospheric Administration (NOAA) and the National Science Foundation (NSF) as part of the Climate Variability Program (CLIVAR)/CO2 Repeat Hydrography Program. The P16S and P16N data sets are available free of charge as a numeric data package (NDP) from the Carbon Dioxide Information Analysis Center (CDIAC). The NDP consists of the oceanographic data files and this printed documentation, which describes the procedures and methods used to obtain the data.

  15. The comparative kinetics of Ca, Sr, And Ra in a freshwater turtle, Trachemys scripta

    SciTech Connect (OSTI)

    Hinton, T.G.

    1989-01-01

    The accumulation of {sup 45}Ca, {sup 47}Ca, {sup 88}Sr, and {sup 226}Ra was studied in the yellow-bellied slider, a common freshwater turtle of the Southeastern US. The author was particularly interested in testing the hypothesis of competitive inhibition, a concept whereby decreasing the intake of a stable dietary element increases the absorption and retention of chemically similar radionuclides. He established four specific hypotheses and examined the processes of absorption and elimination as a function of stable dietary calcium (2 and 20 mg g{sup {minus}1}), season (summer, fall, winter and spring), and age and sex of the animals (hatchlings, juveniles, adult males, adult females, and gravid females). Turtles were gavaged with radionuclides and the gamma-emitting isotopes were detected during serial whole-body counts performed on the live animals for up to 480 d. The analysis of the beta-emitting {sup 45}Ca was accomplished by chemical separation procedures. Data were fit to a two-component exponential retention model by nonlinear regression. The 10-fold reduction in dietary Ca did not affect the elimination rate constants, and increased the assimilation of Sr and Ra only within juveniles. For all animals the absorption of Ca was significantly greater than Sr, and likewise, Sr was greater than Ra. Mean absorptions were generally higher than values reported for other organisms. Unlike many other organisms, absorption rates did not decline at maturity. He suspects that high Ca demands in constructing and maintaining the massive shell, necessitated by the turtle's survival strategy, may contribute to the high absorption, as well as the lack of a decline at maturity. Elimination rate constants were greatest in the summer and declined to levels that were generally not distinguishable from zero in the spring, winter, and fall seasons.

  16. Precise Measurement of Strontium-82 Radioactivity in the Sr-Rb PET

    Office of Science (SC) Website

    Generator | U.S. DOE Office of Science (SC) Precise Measurement of Strontium-82 Radioactivity in the Sr-Rb PET Generator Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Applications of Nuclear Science Applications of Nuclear Science Archives Small Business Innovation Research / Small Business Technology Transfer Funding Opportunities Nuclear Science Advisory Committee (NSAC) Community Resources Contact Information Nuclear Physics U.S. Department of

  17. Chemical isolation of .sup.82 Sr from proton-irradiated Mo targets

    DOE Patents [OSTI]

    Grant, Patrick M.; Kahn, Milton; O'Brien, Jr., Harold A.

    1976-01-01

    Spallation reactions are induced in Mo targets with 200-800 MeV protons to produce microcurie to millicurie amounts of a variety of radionuclides. A six-step radiochemical procedure, incorporating precipitation, solvent extractions, and ion exchange techniques, has been developed for the separation and purification of Sr radioactivities from other spallation products and the bulk target material. Radiostrontium can be quantitatively recovered in a sufficiently decontaminated state for use in biomedical generator development.

  18. Thermodynamic Instability at the Stoichiometric LaAlO3/SrTiO3(001) Interface

    SciTech Connect (OSTI)

    Qiao, Liang; Droubay, Timothy C.; Shutthanandan, V.; Zhu, Zihua; Sushko, P. V.; Chambers, Scott A.

    2010-08-11

    Fully stoichiometric epitaxial LaAlO3 grown on the TiO2-terminated SrTiO3(001) by off-axis pulsed laser deposition is shown to exhibit strong La-Sr cation intermixing. This result is predicted by classical and quantum mechanical calculations of the relative stabilities of abrupt and intermixed states. The extensive cation intermixing has a marked impact on the electronic properties of the interface.

  19. On the photo and thermally stimulated luminescence properties of U doped SrBPO{sub 5}

    SciTech Connect (OSTI)

    Kumar, Mithlesh Mohapatra, M.; Natarajan, V.

    2014-12-15

    Highlights: • Synthesis of SrBPO{sub 5}:U phosphor by solid state route. • Confirmed the stabilization of uranium as UO{sub 2}{sup 2+}. • Evaluation of order of kinetics and trap parameters of the system. • ESR-TSL correlation of the observed glow peak. • Probable mechanism proposed for the TSL glow peak. - Abstract: Un-doped and uranium doped SrBPO{sub 5} samples were synthesized using solid-state reaction route and investigated for their photo and luminescence properties. Photoluminescence (PL) spectrum of uranium doped sample showed five peaks at 502, 524, 547, 569 and 597 nm. The average frequency of symmetric stretching of O=U=O in the ground electronic state was found to be about 757 cm{sup −1}. PL decay time measurements on the system confirmed the stabilization of uranium as UO{sub 2}{sup 2+} in the matrix. Thermally stimulated luminescence (TSL) measurements carried out on gamma irradiated SrBPO{sub 5}:U sample showed a glow peak at 390 °K, whose spectral characteristics was found to be typical of UO{sub 2}{sup 2+}. The trap parameters were evaluated using different heating rate method. Room temperature EPR data suggested the formation of borate and oxygen based radical centers in the gamma-irradiated sample. Detailed EPR-TSL correlation studies confirmed the destruction of the oxygen radical to be responsible for the observed glow peak.

  20. 110K Bi-Sr-Ca-Cu-O superconductor oxide and method for making same

    DOE Patents [OSTI]

    Veal, Boyd W.; Downey, John W.; Lam, Daniel J.; Paulikas, Arvydas P.

    1992-01-01

    A superconductor consisting of a sufficiently pure phase of the oxides of Bi, Sr, Ca, and Cu to exhibit a resistive zero near 110K resulting from the process of forming a mixture of Bi.sub.2 O.sub.3, SrCO.sub.3, CaCO.sub.3 and CuO into aparticulate compact wherein the atom ratios are Bi.sub.2, Sr.sub.1.2-2.2, Ca.sub.1.8-2.4, Cu.sub.3. Thereafter, heating the particulate compact rapidly in the presence of oxygen to an elevated temperature near the melting point of the oxides to form a sintered compact, and then maintaining the sintered compact at the elevated temperature for a prolonged period of time. The sintered compact is cooled and reground. Thereafter, the reground particulate material is compacted and heated in the presence of oxygen to an elevated temperature near the melting point of the oxide and maintained at the elevated temperature for a time sufficient to provide a sufficiently pure phase to exhibit a resistive zero near 110K.

  1. 110K Bi-Sr-Ca-Cu-O superconductor oxide and method for making same

    DOE Patents [OSTI]

    Veal, B.W.; Downey, J.W.; Lam, D.J.; Paulikas, A.P.

    1992-12-22

    A superconductor is disclosed consisting of a sufficiently pure phase of the oxides of Bi, Sr, Ca, and Cu to exhibit a resistive zero near 110K resulting from the process of forming a mixture of Bi[sub 2]O[sub 3], SrCO[sub 3], CaCO[sub 3] and CuO into a particulate compact wherein the atom ratios are Bi[sub 2], Sr[sub 1.2-2.2], Ca[sub 1.8-2.4], Cu[sub 3]. Thereafter, heating the particulate compact rapidly in the presence of oxygen to an elevated temperature near the melting point of the oxides to form a sintered compact, and then maintaining the sintered compact at the elevated temperature for a prolonged period of time. The sintered compact is cooled and reground. Thereafter, the reground particulate material is compacted and heated in the presence of oxygen to an elevated temperature near the melting point of the oxide and maintained at the elevated temperature for a time sufficient to provide a sufficiently pure phase to exhibit a resistive zero near 110K. 7 figs.

  2. Characteristics of conductive SrRuO{sub 3} thin films with different microstructures

    SciTech Connect (OSTI)

    Jia, Q.X.; Chu, F.; Adams, C.D.; Wu, X.D.; Hawley, M.; Cho, J.H.; Findikoglu, A.T.; Foltyn, S.R.; Smith, J.L.; Mitchell, T.E.

    1996-09-01

    Conductive SrRuO{sub 3} thin films were epitaxially grown on (100) LaAlO{sub 3} substrates by pulsed laser deposition over a temperature range from 650{degree}C to 825{degree}C. Well-textured films exhibiting a strong orientation relationship to the underlying substrate could be obtained at a deposition temperature as low as 450{degree}C. The degree of crystallinity of the films improved with increasing deposition temperature as confirmed by x-ray diffraction, transmission electron microscopy, and scanning tunneling microscopy. Scanning electron microscopy revealed no particulates on the film surface. The resistivity of the SrRuO{sub 3} thin films was found to be a strong function of the crystallinity of the film and hence the substrate temperature during film deposition. A residual resistivity ratio (RRR={rho}{sub 300K}/{rho}{sub 4.2K}) of more than 8 was obtained for the SrRuO{sub 3} thin films deposited under optimized processing conditions. {copyright} {ital 1996 Materials Research Society.}

  3. Superconducting and magnetic properties of Sr3Ir4Sn13

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Biswas, P. K.; Amato, A.; Khasanov, R.; Luetkens, H.; Wang, Kefeng; Petrovic, C.; Cook, R. M.; Lees, M. R.; Morenzoni, E.

    2014-10-10

    In this research, magnetization and muon spin relaxation or rotation (µSR) measurements have been performed to study the superconducting and magnetic properties of Sr₃Ir₄Sn₁₃. From magnetization measurements the lower and upper critical fields of Sr₃Ir₄Sn₁₃ are found to be 81(1) Oe and 14.4(2) kOe, respectively. Zero-field µSR data show no sign of any magnetic ordering or weak magnetism in Sr₃Ir₄Sn₁₃. Transverse-field µSR measurements in the vortex state provided the temperature dependence of the magnetic penetration depth λ. The dependence of λ⁻² with temperature is consistent with the existence of single s-wave energy gap in the superconducting state of Sr₃Ir₄Sn₁₃ withmore » a gap value of 0.82(2) meV at absolute zero temperature. The magnetic penetration depth at zero temperature λ(0) is 291(3) nm. The ratio Δ(0)/kBTc = 2.1(1) indicates that Sr₃Ir₄Sn₁₃ should be considered as a strong-coupling superconductor.« less

  4. Structural evolution of epitaxial SrCoOx films near topotactic phase transition

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Jeen, Hyoung Jeen; Lee, Ho Nyung

    2015-12-18

    Control of oxygen stoichiometry in complex oxides via topotactic phase transition is an interesting avenue to not only modifying the physical properties, but utilizing in many energy technologies, such as energy storage and catalysts. However, detailed structural evolution in the close proximity of the topotactic phase transition in multivalent oxides has not been much studied. In this work, we used strontium cobaltites (SrCoOx) epitaxially grown by pulsed laser epitaxy (PLE) as a model system to study the oxidation-driven evolution of the structure, electronic, and magnetic properties. We grew coherently strained SrCoO2.5thin films and performed post-annealing at various temperatures for topotacticmore » conversion into the perovskite phase (SrCoO3-δ). We clearly observed significant changes in electronic transport, magnetism, and microstructure near the critical temperature for the topotactic transformation from the brownmillerite to the perovskite phase. Furthermore, the overall crystallinity was well maintained without much structural degradation, indicating that topotactic phase control can be a useful tool to control the physical properties repeatedly via redox reactions.« less

  5. Temperature dependence of anisotropic magnetoresistance in antiferromagnetic Sr{sub 2}IrO{sub 4}

    SciTech Connect (OSTI)

    Wang, C.; Seinige, H.; Tsoi, M.; Cao, G.; Zhou, J.-S.; Goodenough, J. B.

    2015-05-07

    Temperature-dependent magnetotransport properties of the antiferromagnetic semiconductor Sr{sub 2}IrO{sub 4} are investigated with point-contact devices. The point-contact technique allows to probe very small volumes and, therefore, to look for electronic transport on a microscopic scale. Point-contact measurements with single crystals of Sr{sub 2}IrO{sub 4} were intended to see whether the additional local resistance associated with a small contact area between a sharpened Cu tip and the antiferromagnet shows magnetoresistance (MR) such as that seen in bulk crystals. Point-contact measurements at liquid nitrogen temperature revealed large MRs (up to 28%) for modest magnetic fields (250 mT) applied within an IrO{sub 2} (ab) plane with angular dependence showing a crossover from four-fold to two-fold symmetry with an increasing magnetic field. Point contact measurement exhibits distinctive anisotropic magnetoresistance (AMR) in comparison to a bulk experiment, imposing intriguing questions about the mechanism of AMR in this material. Temperature-dependent MR measurements show that the MR falls to zero at the Neel temperature, but the temperature dependence of the MR ratio differs qualitatively from that of the resistivity. This AMR study helps to unveil the entanglement between electronic transport and magnetism in Sr{sub 2}IrO{sub 4} while the observed magnetoresistive phenomena can be potentially used to sense the antiferromagnetic order parameter in spintronic applications.

  6. Super-Stable, Highly Monodisperse Plasmonic Nanocrystals with 500 Gold Atoms: Au~500(SR)~120

    SciTech Connect (OSTI)

    Kumara, Chanaka; Zuo, Xiaobing; Ilavsky, Dr. Jan; Chapman, Karena; Cullen, David A; Dass, Amala

    2014-01-01

    Determining the composition of plasmonic nanoparticles is challenging due to a deficiency in tools capable of accurately evaluating the number of atoms. Mass spectrometry plays a significant role in determining nanoparticle composition at the atomic level. Significant progress has been made in understanding ultra-small gold nanoparticles, like Au25(SR)18 and Au38(SR)24, with a Au core diameter of 0.97 and 1.3 nm, respectively. However, progress in small plasmonic nanoparticles (2 - 5 nm) is currently challenging, due in part to limitations in synthesizing monodisperse nanoparticles. Here, we report a plasmonic nanocrystal that is highly monodisperse, with an unprecedented variation of less than 20 gold atoms. The composition of the super-stable plasmonic nanocrystals at 115 kDa was determined to contain Au500 10SR120 3. The Au~500 system, named Faraduarate-500, is the largest size to be characterized using high resolution ESI mass spectrometry. Atomic pair distribution function (PDF) data shows that the local atomic structure is consistent with a face-centered cubic (fcc) or Marks decahedral arrangement. High resolution scanning transmission electron microscopy images show that the diameter is 2.4 0.1 nm. The radius of gyration measured by small angle X-ray scattering (SAXS), is 1.05 0.05 nm, and the size and the shape of SAXS molecular envelope are in agreement with TEM and PDF measurements.

  7. New insulating antiferromagnetic quaternary iridates MLa10Ir4O24 (M=Sr, Ba)

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Zhao, Qingbiao; Han, Fei; Stoumpos, Constantinos C.; Han, Tian -Heng; Li, Hao; Mitchell, J. F.

    2015-07-01

    Recently, oxides of Ir4+ have received renewed attention in the condensed matter physics community, as it has been reported that certain iridates have a strongly spin-orbital coupled (SOC) electronic state, Jeff = ½, that defines the electronic and magnetic properties. The canonical example is the Ruddlesden-Popper compound Sr2IrO4, which has been suggested as a potential route to a new class of high temperature superconductor due to the formal analogy between Jeff = ½ and the S = ½ state of the cuprate superconductors. The quest for other iridium oxides that present tests of the underlying SOC physics is underway. Inmore » this spirit, here we report the synthesis and physical properties of two new quaternary tetravalent iridates, MLa10Ir4O24 (M = Sr, Ba). The crystal structure of both compounds features isolated IrO6 octahedra in which the electronic configuration of Ir is d5. As a result, both compounds order antiferromagnetically despite the lack of obvious superexchange pathways, and resistivity measurement shows that SrLa10Ir4O24 is an insulator.« less

  8. Optically pumped cerium-doped LiSrAlF.sub.6 and LiCaAlF.sub.6

    DOE Patents [OSTI]

    Marshall, Christopher D.; Payne, Stephen A.; Krupke, William F.

    1996-01-01

    Ce.sup.3+ -doped LiSrAlF.sub.6 crystals are pumped by ultraviolet light which is polarized along the c axis of the crystals to effectively energize the laser system. In one embodiment, the polarized fourth harmonic light output from a conventional Nd:YAG laser operating at 266 nm is arranged to pump Ce:LiSrAlF.sub.6 with the pump light polarized along the c axis of the crystal. The Ce:LiSrAlF.sub.6 crystal may be placed in a laser cavity for generating tunable coherent ultraviolet radiation in the range of 280-320 nm. Additionally, Ce-doped crystals possessing the LiSrAlF.sub.6 type of chemical formula, e.g. Ce-doped LiCaAlF.sub.6 and LiSrGaF.sub.6, can be used. Alternative pump sources include an ultraviolet-capable krypton or argon laser, or ultraviolet emitting flashlamps. The polarization of the pump light will impact operation. The laser system will operate efficiently when light in the 280-320 nm gain region is injected or recirculated in the system such that the beam is also polarized along the c axis of the crystal. The Ce:LiSrAlF.sub.6 laser system can be configured to generate ultrashort pulses, and it may be used to pump other devices, such as an optical parametric oscillator.

  9. Optically pumped cerium-doped LiSrAlF{sub 6} and LiCaAlF{sub 6}

    DOE Patents [OSTI]

    Marshall, C.D.; Payne, S.A.; Krupke, W.F.

    1996-05-14

    Ce{sup 3+}-doped LiSrAlF{sub 6} crystals are pumped by ultraviolet light which is polarized along the c axis of the crystals to effectively energize the laser system. In one embodiment, the polarized fourth harmonic light output from a conventional Nd:YAG laser operating at 266 nm is arranged to pump Ce:LiSrAlF{sub 6} with the pump light polarized along the c axis of the crystal. The Ce:LiSrAlF{sub 6} crystal may be placed in a laser cavity for generating tunable coherent ultraviolet radiation in the range of 280-320 nm. Additionally, Ce-doped crystals possessing the LiSrAlF{sub 6} type of chemical formula, e.g. Ce-doped LiCaAlF{sub 6} and LiSrGaF{sub 6}, can be used. Alternative pump sources include an ultraviolet-capable krypton or argon laser, or ultraviolet emitting flashlamps. The polarization of the pump light will impact operation. The laser system will operate efficiently when light in the 280-320 nm gain region is injected or recirculated in the system such that the beam is also polarized along the c axis of the crystal. The Ce:LiSrAlF{sub 6} laser system can be configured to generate ultrashort pulses, and it may be used to pump other devices, such as an optical parametric oscillator. 10 figs.

  10. High temperature crystal structures and superionic properties of SrCl{sub 2}, SrBr{sub 2}, BaCl{sub 2} and BaBr{sub 2}

    SciTech Connect (OSTI)

    Hull, Stephen; Norberg, Stefan T.; Ahmed, Istaq; Eriksson, Sten G.; Mohn, Chris E.

    2011-11-15

    The structural properties of the binary alkaline-earth halides SrCl{sub 2}, SrBr{sub 2}, BaCl{sub 2} and BaBr{sub 2} have been investigated from ambient temperature up to close to their melting points, using the neutron powder diffraction technique. Fluorite-structured SrCl{sub 2} undergoes a gradual transition to a superionic phase at 900-1100 K, characterised by an increasing concentration of anion Frenkel defects. At a temperature of 920(3) K, the tetragonal phase of SrBr{sub 2} undergoes a first-order transition to a cubic fluorite phase. This high temperature phase shows the presence of extensive disorder within the anion sublattice, which differs from that found in superionic SrCl{sub 2}. BaCl{sub 2} and BaBr{sub 2} both adopt the cotunnite crystal structure under ambient conditions. BaCl{sub 2} undergoes a first-order structural transition at 917(5) K to a disordered fluorite-structured phase. The relationship between the (disordered) crystal structures and the ionic conductivity behaviour is discussed and the influence of the size of the mobile anion on the superionic behaviour is explored. - Graphical abstract: Anomalous behaviour of the lattice expansion of SrCl{sub 2} at temperatures of {approx}1000 K is associated with the gradual transition to a superionic phase, whilst SrBr{sub 2} undergoes a first-order structural transition ({beta}{yields}{alpha}) to a fluorite-structured superionic phase at 920(3) K. Highlights: > Anomalous behaviour of the lattice expansion of SrCl{sub 2} occurs at temperatures {approx}1000 K. > Crystal structure of {beta}-SrBr{sub 2} is described in detail. > On heating, SrBr{sub 2} and BaCl{sub 2} transform to a fluorite-structured superionic phase. > Temperature dependence of the BaCl{sub 2} and BaBr{sub 2} structures is presented. > Nature of the superionic phases within the alkaline-earth halides is discussed.

  11. ABUNDANCES OF C, N, Sr, AND Ba ON THE RED GIANT BRANCH OF {omega} CENTAURI

    SciTech Connect (OSTI)

    Stanford, Laura M.; Da Costa, G. S.; Norris, John E. E-mail: gdc@mso.anu.edu.a

    2010-05-10

    Abundances relative to iron for carbon, nitrogen, strontium, and barium are presented for 33 stars on the red giant branch (RGB) of the globular cluster {omega} Centauri. They are based on intermediate-resolution spectroscopic data covering the blue spectral region analyzed using spectrum synthesis techniques. The data reveal the existence of a broad range in the abundances of these elements, and a comparison with similar data for main-sequence stars enables insight into the evolutionary history of the cluster. The majority of the RGB stars were found to be depleted in carbon, i.e., [C/Fe] < 0, while [N/Fe] for the same stars shows a range of {approx}1 dex, from [N/Fe] {approx} 0.7 to 1.7 dex. The strontium-to-iron abundance ratios varied from solar to mildly enhanced (0.0 {<=} [Sr/Fe] {<=} 0.8), with [Ba/Fe] generally equal to or greater than [Sr/Fe]. The carbon and nitrogen abundance ratios for the one known CH star in the sample, ROA 279, are [C/Fe] = 0.6 and [N/Fe] = 0.5 dex. Evidence for evolutionary mixing on the RGB is found from the fact that the relative carbon abundances on the main sequence are generally higher than those on the RGB. However, comparison of the RGB and main-sequence samples shows that the upper level of nitrogen enhancement is similar in both sets at [N/Fe] {approx} 2.0 dex. This is most likely the result of primordial rather than evolutionary mixing processes. One RGB star, ROA 276, was found to have Sr and Ba abundance ratios similar to the anomalous Sr-rich main-sequence star S2015448. High-resolution spectra of ROA 276 were obtained with the Magellan Telescope/MIKE spectrograph combination to confirm this result, revealing that ROA 276 is indeed an unusual star. For this star, calculations of the depletion effect, the potential change in surface abundance that results from the increased depth of the convective envelope as a star moves from the main sequence to the RGB, strongly suggest that the observed Sr enhancement in ROA 276 is of

  12. Sandia National Laboratories and Internships

    Broader source: Energy.gov (indexed) [DOE]

    Sandra Begay-Campbell SNL Roger Taylor NREL Lizana Pierce DOE, Project Manager Victoria DeHerrera Navarro, Sr. Project Analyst Scott Haase NREL Sandra Begay-Campbell *Navajo ...

  13. Single-crystal epitaxial thin films of SrFeO{sub 2} with FeO{sub 2} 'infinite layers'

    SciTech Connect (OSTI)

    Inoue, Satoru; Kawai, Masanori; Shimakawa, Yuichi [Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan); Mizumaki, Masaichiro; Kawamura, Naomi [Japan Synchrotron Radiation Research Institute/SPring-8, Sayo, Hyogo 679-5198 (Japan); Watanabe, Takashi; Tsujimoto, Yoshihiro; Kageyama, Hiroshi; Yoshimura, Kazuyoshi [Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502 (Japan)

    2008-04-21

    Single-crystal thin films of SrFeO{sub 2}, which is an oxygen-deficient perovskite with ''infinite layers'' of Fe{sup 2+}O{sub 2}, were prepared by using CaH{sub 2} for low-temperature reduction of epitaxial SrFeO{sub 2.5} single-crystal films deposited on KTaO{sub 3} substrates. This reduction process, removing oxygen ions from the perovskite structure framework and causing rearrangements of oxygen ions, topotactically transforms the brownmillerite SrFeO{sub 2.5} to the c-axis oriented SrFeO{sub 2}.

  14. Pressure-induced collapsed-tetragonal phase in SrCo2As2

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Jayasekara, W. T.; Kaluarachchi, U. S.; Ueland, B. G.; Pandey, Abhishek; Lee, Y. B.; Taufour, V.; Sapkota, A.; Kothapalli, K.; Sangeetha, N. S.; Fabbris, G.; et al

    2015-12-08

    We present high-energy x-ray diffraction data under applied pressures up to p = 29GPa, neutron diffraction measurements up to p = 1.1GPa, and electrical resistance measurements up to p = 5.9GPa, on SrCo2As2. Our x-ray diffraction data demonstrate that there is a first-order transition between the tetragonal (T) and collapsed-tetragonal (cT) phases, with an onset above approximately 6 GPa at T = 7K. The pressure for the onset of the cT phase and the range of coexistence between the T and cT phases appears to be nearly temperature independent. The compressibility along the a axis is the same for themore » T and cT phases, whereas, along the c axis, the cT phase is significantly stiffer, which may be due to the formation of an As-As bond in the cT phase. Our resistivity measurements found no evidence of superconductivity in SrCo2As2 for p ≤ 5.9 GPa and T ≥ 1.8 K. The resistivity data also show signatures consistent with a pressure-induced phase transition for p ≳ 5.5 GPa. Single-crystal neutron diffraction measurements performed up to 1.1 GPa in the T phase found no evidence of stripe-type or A-type antiferromagnetic ordering down to 10 K. Spin-polarized total-energy calculations demonstrate that the cT phase is the stable phase at high pressure with a ca ratio of 2.54. As a result, these calculations indicate that the cT phase of SrCo2As2 should manifest either A-type antiferromagnetic or ferromagnetic order.« less

  15. Defect Engineering in SrI2:Eu2+ Single Crystal Scintillators

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Wu, Yuntao; Boatner, Lynn A.; Lindsey, Adam C.; Zhuravleva, Mariya; Jones, Steven; Auxier, John D.; Hall, Howard L.; Melcher, Charles L.

    2015-06-23

    Eu2+-activated strontium iodide is an excellent single crystal scintillator used for gamma-ray detection and significant effort is currently focused on the development of large-scale crystal growth techniques. A new approach of molten-salt pumping or so-called melt aging was recently applied to optimize the crystal quality and scintillation performance. Nevertheless, a detailed understanding of the underlying mechanism of this technique is still lacking. The main purpose of this paper is to conduct an in-depth study of the interplay between microstructure, trap centers and scintillation efficiency after melt aging treatment. Three SrI2:2 mol% Eu2+ single crystals with 16 mm diameter were grownmore » using the Bridgman method under identical growth conditions with the exception of the melt aging time (e.g. 0, 24 and 72 hours). Using energy-dispersive X-ray spectroscopy, it is found that the matrix composition of the finished crystal after melt aging treatment approaches the stoichiometric composition. The mechanism responsible for the formation of secondary phase inclusions in melt-aged SrI2:Eu2+ is discussed. Simultaneous improvement in light yield, energy resolution, scintillation decay-time and afterglow is achieved in melt-aged SrI2:Eu2+. The correlation between performance improvement and defect structure is addressed. The results of this paper lead to a better understanding of the effects of defect engineering in control and optimization of metal halide scintillators using the melt aging technique.« less

  16. Interaction of Sr-90 with site candidate soil for demonstration disposal facility at Serpong

    SciTech Connect (OSTI)

    Setiawan, Budi; Mila, Oktri; Safni

    2014-03-24

    Interaction of radiostrontium (Sr-90) with site candidate soil for demonstration disposal facility to be constructed in the near future at Serpong has been done. This activity is to anticipate the interim storage facility at Serpong nuclear area becomes full off condition, and show to the public how radioactive waste can be well managed with the existing technology. To ensure that the location is save, a reliability study of site candidate soil becomes very importance to be conducted through some experiments consisted some affected parameters such as contact time, effect of ionic strength, and effect of Sr{sup +} ion in solution. Radiostrontium was used as a tracer on the experiments and has role as radionuclide reference in low-level radioactive waste due to its long half-live and it's easy to associate with organism in nature. So, interaction of radiostrontium and soil samples from site becomes important to be studied. Experiment was performed in batch method, and soil sample-solution containing radionuclide was mixed in a 20 ml of PE vial. Ratio of solid: liquid was 10{sup −2} g/ml. Objective of the experiment is to collect the specific characteristics data of radionuclide sorption onto soil from site candidate. Distribution coefficient value was used as indicator where the amount of initial and final activities of radiostrontium in solution was compared. Result showed that equilibrium condition was reached after contact time 10 days with Kd values ranged from 1600-2350 ml/g. Increased in ionic strength in solution made decreased of Kd value into soil sample due to competition of background salt and radiostrontium into soil samples, and increased in Sr ion in solution caused decreased of Kd value in soil sample due to limitation of sorption capacity in soil samples. Fast condition in saturated of metal ion into soil samples was reached due to a simple reaction was occurred.

  17. Flux pinning by precipitates in the Bi-Sr-Ca-Cu-O system

    DOE Patents [OSTI]

    Shi, Donglu

    1992-01-01

    A fundamental pinning mechanism has been identified in the Bi-Sr-Ca-Cu-O system. The pinning strength has been greatly increased by the introduction of calcium- and copper-rich precipitates into the sample matrix. The calcium and copper are supersaturated in the system by complete melting, and the fine calcium and copper particles precipitated during subsequent crystallization anneal to obtain the superconducting phases. The intragrain critical current density has been increased from the order of 10.sup.5 A/cm.sup.2 to 10.sup.7 A/cm.sup.2 at 5 T.

  18. Special Report: OAS-SR-10-03 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    3 Special Report: OAS-SR-10-03 September 14, 2010 Department's Freedom of Information Act Request Process The Freedom of Information Act (FOIA or the Act) (5 U.S.C. 552) specifies the information that all Federal Agencies are required to make available to the public. The Act, as it is applicable to the Department of Energy (Department), is presented in 10 CFR 1004. According to the Department's most recent Annual FOIA Report, in Fiscal Year (FY) 2009, 1,809 FOIA requests were received. Of these,

  19. Projected shell model study of neutron-rich deformed isotopes of Sr and Zr

    SciTech Connect (OSTI)

    Verma, Sonia; Dar, Parvaiz Ahmad; Devi, Rani [Department of Physics and Electronics, University of Jammu, Jammu-180006 (India)

    2008-02-15

    The projected shell model (PSM) study of {sup 98-102}Sr and {sup 100-104}Zr nuclei is carried out. The reliability of the ground-state wave function is checked by reproducing yrast spectra and electromagnetic properties. The mechanism for the onset of sudden and large deformation at N=60 is worked out. The present piece of research work has unified the two different, or conflicting, early explanations for the onset of deformation at N=60 by the spherical shell model and mean-field theory.

  20. Pulse shaping using nonlinear dielectric SrTiO{sub 3}

    SciTech Connect (OSTI)

    Findikoglu, A.T.; Reagor, D.W.; Rasmussen, K.O.; Bishop, A.R.; Gronbech-Jensen, N.; Jia, Q.X.; Fan, Y.; Kwon, C.

    1999-03-01

    We have studied electromagnetic pulse shaping in coplanar waveguide delay lines made from superconducting YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} electrodes on nonlinear dielectric SrTiO{sub 3} single-crystal substrates. The delay lines exhibited bias- and temperature-dependent nonlinearity and dispersion, with associated pulse-shaping effects. At low temperatures and under certain bias conditions, the interplay of dispersion and nonlinearity has led to stable and compact wave forms, reminiscent of microwave solitons. {copyright} {ital 1999 American Institute of Physics.}

  1. Catalytic Partial oxidation of n-Tetradecane Using Pyrochlores: Effect of Rh and Sr Substitution

    SciTech Connect (OSTI)

    Haynes, D.J.; Berry, D.A.; Shekhawat, Dushyant; Spivey, J.J.

    2008-07-31

    The catalytic partial oxidation (CPOX) of transportation fuels into synthesis gas (H2 + CO) for fuel cells is complicated by the large quantities of aromatics and sulfur-containing compounds commonly found in these fuels. Traditional supported metal catalysts are easily poisoned by these species which adsorb strongly onto the electron-rich metal clusters. The use of noble metal and/or oxide based catalyst systems may offer higher activity and stability, but only if the metal can be bound into a thermally stable structure. To that end, Rh metal was substituted into the structure of a lanthanum zirconate (LZ) pyrochlore to give La2RhyZr(2 y)O(7-j,) (LRZ) to produce a strongly bound, well-dispersed metal which is active for CPOX. A second catalyst was prepared in which Sr was substituted for a portion of La in the LRZ structure, producing La(2 x)SrxRhyZr(2 y)O(7-j) (LSRZ). Each of these pyrochlore catalysts, including the unsubstituted LZ, were characterized and screened for activity in the CPOX of ntetradecane (TD), which is a surrogate for linear paraffins typical of diesel fuel. Results were compared to a commercial Rh/g-Al2O3 catalyst. X-ray diffraction patterns of both the LZ and LRZ showed that each had the cubic unit-cell pyrochlore structure. However, substitution of Sr resulted in a binary perovskite-pyrochlore phase with a defect SrZrO3 phase. Hydrogen pulse chemisorption and temperature programmed reduction studies confirmed that Rh metal was substituted into the structure of the LRZ and LSRZ, and was reducible. Activity screening with the CPOX of TD showed that the Rh substituted in both LRZ and LSRZ is able to retain activity-producing essentially equilibrium synthesis gas yields, as was the Rh/g-Al2O3. Temperature programmed oxidation experiments performed after the CPOX of TD demonstrated that the amount of carbon was quantitatively similar for each catalyst (roughly 0.3 gcarbon/gcatalyst after each run), with the exception of LSRZ, which had

  2. Rapid method to determine actinides and 89/90Sr in limestone and marble samples

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Maxwell, Sherrod L.; Culligan, Brian; Hutchison, Jay B.; Utsey, Robin C.; Sudowe, Ralf; McAlister, Daniel R.

    2016-04-12

    A new method for the determination of actinides and radiostrontium in limestone and marble samples has been developed that utilizes a rapid sodium hydroxide fusion to digest the sample. Following rapid pre-concentration steps to remove sample matrix interferences, the actinides and 89/90Sr are separated using extraction chromatographic resins and measured radiometrically. The advantages of sodium hydroxide fusion versus other fusion techniques will be discussed. Lastly, this approach has a sample preparation time for limestone and marble samples of <4 hours.

  3. Target and orbit feedback simulations of a muSR beamline at BNL

    SciTech Connect (OSTI)

    MacKay, W. W.; Fischer, W.; Blaskiewicz, M.; Pile, P.

    2015-05-03

    Well-polarized positive surface muons are a tool to measure the magnetic properties of materials since the precession rate of the spin can be determined from the observation of the positron directions when the muons decay. The use of the AGS complex at BNL has been explored for a muSR facility previously. Here we report simulations of a beamline with a target inside a solenoidal field, and of an orbit feed-back system with single muon beam positioning monitors based on technology available today

  4. La??xSrxCuO? superconductor nanowire devices

    SciTech Connect (OSTI)

    Litombe, N. E.; Bollinger, A. T.; Hoffman, J. E.; Bozovic, I.

    2014-07-02

    La??xSrxCuO? nanowire devices have been fabricated and characterized using electrical transport measurements. Nanowires with widths down to 80 nm are patterned using high-resolution electron beam lithography. However, the narrowest nanowires show incomplete superconducting transitions with some residual resistance at T = 4 K. Here, we report on refinement of the fabrication process to achieve narrower nanowire devices with complete superconducting transitions, opening the path to the study of novel physics arising from dimension-limited superconductivity on the nanoscale.

  5. Systematic Study of the {sup 87}Sr Clock Transition in an Optical Lattice

    SciTech Connect (OSTI)

    Ludlow, Andrew D.; Boyd, Martin M.; Zelevinsky, Tanya; Foreman, Seth M.; Blatt, Sebastian; Notcutt, Mark; Ido, Tetsuya; Ye Jun

    2006-01-27

    With ultracold {sup 87}Sr confined in a magic wavelength optical lattice, we present the most precise study (2.8 Hz statistical uncertainty) to date of the {sup 1}S{sub 0}-{sup 3}P{sub 0} optical clock transition with a detailed analysis of systematic shifts (19 Hz uncertainty) in the absolute frequency measurement of 429 228 004 229 869 Hz. The high resolution permits an investigation of the optical lattice motional sideband structure. The local oscillator for this optical atomic clock is a stable diode laser with its hertz-level linewidth characterized by an octave-spanning femtosecond frequency comb.

  6. Bi-Sr-Ca-Cu-O surface studied by means of scanning tunnelling microscope

    SciTech Connect (OSTI)

    Witek, A.; Dabkowski, A.; Rauluszkiewicz, J.

    1989-03-10

    Surface topography of the high-T/sub c/ superconductor BiSrCaCu/sub 2/O/sub x/ has been investigated by means of scanning tunnelling microscope. The measurements were performed on the natural surface of ceramics material in air at room temperature. It can be deduced from the surface images, that bulk orthorhombic crystal structure extends to the surface. The surface seems to be uniform metallic in character and not drastically contaminated. Regular steps observed on the surface correspond to the dimension of the unit cell in z direction or its multiples.

  7. Special Report: OAS-SR-10-01 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    10-01 Special Report: OAS-SR-10-01 July 21, 2010 Need for Enhanced Surveillance During the Yucca Mountain Project Shut Down The Nuclear Waste Policy Act Amendments of 1987 (Act) designated Yucca Mountain in Southwestern Nevada as the site for a national geologic repository for high-level nuclear waste, primarily the waste generated by U.S. commercial nuclear plants. The Department of Energy (Department) assigned management of the program to the Office of Civilian Nuclear Waste Management (OCRWM)

  8. Action spectroscopy of SrCl{sup +} using an integrated ion trap time-of-flight mass spectrometer

    SciTech Connect (OSTI)

    Puri, Prateek Schowalter, Steven J.; Hudson, Eric R.; Kotochigova, Svetlana; Petrov, Alexander

    2014-07-07

    The photodissociation cross-section of SrCl{sup +} is measured in the spectral range of 36 000–46 000 cm{sup −1} using a modular time-of-flight mass spectrometer (TOF-MS). By irradiating a sample of trapped SrCl{sup +} molecular ions with a pulsed dye laser, X{sup 1}Σ{sup +} state molecular ions are electronically excited to the repulsive wall of the A{sup 1}Π state, resulting in dissociation. Using the TOF-MS, the product fragments are detected and the photodissociation cross-section is determined for a broad range of photon energies. Detailed ab initio calculations of the SrCl{sup +} molecular potentials and spectroscopic constants are also performed and are found to be in good agreement with experiment. The spectroscopic constants for SrCl{sup +} are also compared to those of another alkaline earth halogen, BaCl{sup +}, in order to highlight structural differences between the two molecular ions. This work represents the first spectroscopy and ab initio calculations of SrCl{sup +}.

  9. Enhanced inverse spin Hall contribution at high microwave power levels in La{sub 0.67}Sr{sub 0.33}MnO{sub 3}/SrRuO{sub 3} epitaxial bilayers

    SciTech Connect (OSTI)

    Haidar, S. M. Lustikova, J.; Shiomi, Y.; Saitoh, E.

    2015-10-12

    We have investigated microwave power dependence of dc voltage generated upon ferromagnetic resonance in a La{sub 0.67}Sr{sub 0.33}MnO{sub 3}/SrRuO{sub 3} epitaxial bilayer film at room temperature. With increasing microwave power above ∼75 mW, the magnitude of the voltage signal decreases as the sample temperature approaches the Curie temperature of La{sub 0.67}Sr{sub 0.33}MnO{sub 3} due to heating effects. By analyzing the dependence of the voltage signal on the direction of the magnetic field, we show that with increasing microwave power the contribution from the inverse spin Hall effect becomes more dominant than that from the anisotropic magnetoresistance effect.

  10. SR0001

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    For Immediate Release January 12, 2000 Media Contact: Bill Taylor (803) 725-2889 Nuclear Security Oversight Panel Visits SRS As Part Of NSSA Tour Flag Ribbon Art Representatives from the Special Oversight Panel on Department of Energy Reorganization will be visiting the Savannah River Site (SRS) on Thursday, January 13, 2000. The Panel is touring Department of Energy facilities that will become part of the National Nuclear Security Administration (NNSA). Members of the Panel will provide

  11. SR0002

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    , 2000 Media Contact: Bill Taylor (803) 725-2889 General Eugene Habiger, DOE Security Czar To Visit SRS Flag Ribbon Art General Eugene Habiger (USAF Retired), the Department of Energy's Security Czar and Director of Security and Emergency Response, will visit the Savannah River Site (SRS) on Wednesday, February 2, 2000. Following his visit to SRS facilities and a first-hand look at security functions, Gen. Habiger will meet with media representatives. General Habiger will be available for

  12. SR0003

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    4, 2000 Media Contact: Bill Taylor (803) 725-2889 DOE To Present Savannah River Site's Upcoming Fiscal Year 2001 Budget Flag Ribbon Art Aiken, SC -- The public is invited to view the Department of Energy's (DOE) Fiscal Year 2001 budget presentation that will be provided via satellite downlink starting at 1:30 p.m., Monday, February 7, 2000, at Aiken Technical College's Learning Resource Center amphitheater. The annual DOE budget roll out will feature an introduction by Secretary of Energy Bill

  13. SR0005

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    April 7, 2000 Media Contact: Rick Ford (803) 725-2889 Invitation To Cover Environmental Management Science Program National Workshop April 24-27 Flag Ribbon Art NOTE TO EDITORS AND NEWS DIRECTORS The latest advances in environmental cleanup science and technology will be on display at the Department of Energy Environmental Management Science Program (EMSP) National Workshop in Atlanta, GA on April 24-27 at the Westin Peachtree Plaza. Hosted by DOE's Office of Environmental Management, Office of

  14. SR0006

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    April 25, 2000 Media Contact: Rick Ford (803) 725-2889 DOE Cleanup Science On Display In Atlanta National Workshop Shares Research Progress Flag Ribbon Art The latest advances in environmental cleanup science and technology are on display at the Department of Energy Environmental Management Science Program (EMSP) National Workshop in Atlanta, GA on April 25-27 at the Westin Peachtree Plaza. Hosted by DOE's Office of Environmental Management and Office of Science, Idaho Operations Office, and

  15. SR0007

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Environmental Cleanup Technology Conference To Be Held Flag Ribbon Art The Savannah River Operations Office of the Department of Energy is hosting the Environmental Restoration Technology End User Conference on June 6-8 at the Sheraton Augusta Hotel, in Augusta, Georgia. The principal purposes of the conference are to share cleanup successes and innovations from the two co-sponsoring federal agencies-the Department of Defense and the Environmental Protection Agency-and DOE sites; promote the

  16. SR0010

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    1, 2000 Media Contact: Jim Giusti (803) 725-2889 DOE Hosts Radioactive Materials Transportation Workshop Flag Ribbon Art Note To Editors And News Directors: Aiken, SC - The Department of Energy will host an informational transportation workshop tomorrow and Friday (June 22-23) in Augusta, GA. The workshop is part of an ongoing series to involve state and local officials, and is designed to help share information about DOE transportation of radioactive materials. The theme of this particular

  17. SR0011

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    26, 2000 Media Contact: Rick Ford (803) 725-2889 Energy Secretary Bill Richardson to Visit Savannah River Site Groundbreaking for Tritium Facility, 50th Anniversary on Agenda Flag Ribbon Art Media Advisory Secretary of Energy Bill Richardson will be at the Savannah River Site and Fort Discovery on Thursday, July 27, to break ground for the new $400 million Tritium Extraction Facility and celebrate the 50th Anniversary of the Savannah River Site. Secretary Richardson will be joined by Gen. John

  18. SR0012

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    July 31, 2000 Media Contact: Rick Ford (803) 725-2889 "Melt And Dilute" Selected To Treat DOE's Spent Nuclear Fuel At Savannah River Flag Ribbon Art Technology Supports Administration's Non-Proliferation Commitments The Department of Energy has selected a new technology to manage the majority of spent fuel being received at the Department of Energy's (DOE) Savannah River Site (SRS), near Aiken, S.C. "I've given the green light to the SRS workforce to put the melt and dilute

  19. SR0016

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    5, 2000 Media Contact: Bill Taylor (803) 725-2889 DOE Meeting To Focus On New Compensation Program For Work-Related Illness Effecting SRS Employees Flag Ribbon Graphic Aiken, SC - The Department of Energy's (DOE) Assistant Secretary for Environment, Safety and Health, Dr. David Michaels, will hold a public meeting to discuss the new Federal compensation program for DOE contract employees such as Savannah River Site workers who have work related illnesses. The meeting will be held Thursday,

  20. SR0017

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Bill Taylor (803) 725-2889 Media Availability For Dr. David Michaels, Assistant Secretary for Environment, Safety and Health Flag Ribbon Graphic Note to Editors and News Directors MEDIA AVAILABILITY 6:15 p.m. Thursday, December 7 Aiken Technical College's Continuing Education Confernce Center, Room 733 PRIOR TO: DOE Meeting to Focus on New Compensation Program for Work-Related Illness Effecting SRS Employees The Department of Energy's (DOE) Assistant Secretary for Environment, Safety and Health,

  1. SR0101

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    8, 2001 Media Contact: Bill Taylor (803) 725-2889 Savannah River Site's Martin Luther King, Jr., Day Observance Flag Ribbon Art Media organizations are invited to attend and cover the Savannah River Site's observation of Martin Luther King Jr. Day on Wednesday, January 10, 2001. The observance will be held in the Main Administration Area's cafeteria, starting at 2 p.m. The site-wide observance will feature Mr. Marshall Smith of Orangeburg, S.C., noted for his renditions of Dr. King's speeches.

  2. SR0103

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    7, 2001 Media Contact: James Giusti (803) 725-2889 Note to Editors and News Directors Flag Ribbon Art On May 8, media representatives are invited to observe the first shipment of transuranic, or TRU, waste leave the Savannah Rive Site (SRS) for the Waste Isolation Plant (WIPP), located in Carlsbad, NM. A truck, loaded with the TRUPACT-II shipping containers, will pass through the Site’s Jackson Barricade (Barricade #1) en route to I-20 at about 12:15 p.m. Media representatives planning to view

  3. SR0104

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    8, 2001 Media Contact: James Giusti (803) 725-2889 Savannah River Site Sends First Shipment of Transuranic Waste to WIPP Flag Ribbon Art AIKEN, S.C., May 8 – The first shipment of transuranic, or TRU, waste from the Savannah River Site (SRS) to the Waste Isolation Pilot Plant (WIPP), located in Carlsbad, New Mexico, left the Site shortly after noon today. This shipment, which consists of 42 drums of transuranic waste, is the first of at least four SRS shipments to WIPP planned for fiscal year

  4. SR0107

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    4, 2001 Media Contact: Bill Taylor (803) 725-2889 DOE & DOL Hold Public Meetings For Energy Employees Occupational Illness Compensation Program At Flag Ribbon Art Aiken SC (June 14, 2001) - The U.S. Departments of Labor and Energy will hold two public meetings at 1 p.m. and 7 p.m., Tuesday, June 19 at the North Augusta Community Center, North Augusta, SC, for employees and families who may be eligible for compensation under the Energy Employees Occupational Illness Compensation Program Act.

  5. SR0108

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    8, 2001 Media Contact: Jim Giusti (803) 725-2889 DOE Announces Plans For Offsite Treatment & Disposal of SRS Waste Flag Ribbon Art Aiken, SC -- The Department of Energy (DOE) has published an Amended Record of Decision (ROD) to the Savannah River Site (SRS) Waste Management Environmental Impact Statement (DOE/EIS-0217). This ROD modifies earlier decisions concerning the treatment and disposal of low-level radioactive waste (LLW) and mixed hazardous and low-level radioactive waste (MLLW) at

  6. SR0110

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    4, 2001 Media Contact: Bill Taylor (803) 725-2889 Energy Employees Compensation Center To Open In North Augusta, SC Flag Ribbon Art Aiken SC (July 24) -- A resource center where nuclear weapons workers can go for help to file claims for compensation under the Energy Employees Occupational Illness Compensation Program Act will begin operations with an opening ceremony at 11 a.m., Friday, July 27. The Energy Employees Compensation Center at 1708 Bunting Drive, North Augusta, SC, is sponsored

  7. SR0111

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    4, 2001 Media Contact: Martha Merriweather (803) 725-2889 Dept. Of Energy Kicks Off Its 2001 Combined Federal Campaign Flag Ribbon Art AIKEN, SC - DOE employees at SRS begin their 2001 CFC with an Opening Program celebration on October 9. The Campaign runs through October 18, concluding with a Closing Ceremony on October 25. This year's campaign theme is "Caring for Community." The CFC is the government's way for federal employees to contribute to community agencies as well as agencies

  8. SR0112

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    News Release Logo For Immediate Release October 18, 2001 Media Contact: Julie Petersen (803) 725-2889 DOE ANNOUNCES RECORD OF DECISION ON SRS SALT WASTE PROCESSING ALTERNATIVES Flag Ribbon Art AIKEN, SC -- The U.S. Department of Energy (DOE) announced that it has selected Caustic Side Solvent Extraction as the Savannah River Site (SRS) Salt Processing preferred alternative for treating salt-bearing high-level radioactive waste. The Department's decision is outlined in a Record of Decision (ROD)

  9. SR0113?

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    December 5, 2001 Media Contact: Bill Taylor (803) 725-2889 DOE Announces Availability Of Final RFP For SRS Salt Processing Facility Flag Ribbon Art Aiken, SC -- Today the Department of Energy (DOE) made available the Final Request for Proposals (RFP) for the acquisition of services to design, construct, and commission a facility to process the salt portion of high-level radioactive waste currently stored in underground tanks at the Savannah River Site (SRS). The Salt Waste Processing Facility

  10. SR0201

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    February 5, 2001 Media Contact: Bill Taylor (803) 725-2889 SRS Environmental Management FY2003 Budget and Top-To-Bottom Review Presented At Friday Meeting Flag Ribbon Art The public is invited to a presentation and discussion of the Department of Energy's recent Top-To-Bottom Review of the Environmental Management (EM) program and the Savannah River Site Fiscal Year (FY) 2003 EM budget request. WHO: Senior Savannah River Site Officials WHEN: Friday, February 8, 2002 2 - 3 p.m. WHERE: Aiken

  11. SR0203

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    31, 2002 Media Contact: Julie Petersen (803) 725-2889 DOE Announces Availability Of Final EIS On SRS High-Level Waste Tank Closures Flag Ribbon Art AIKEN, SC; May 31 - The Department of Energy (DOE) Savannah River Site (SRS) announced today the availability of the Final Environmental Impact Statement (EIS) on the proposed closing of additional high-level waste (HLW) tanks at SRS. The EIS evaluated three alternatives regarding closure of the HLW tanks: (1) Stabilize Tanks; (2) Clean and Remove

  12. SR0205

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    19, 2002 Media Contact: Julie Petersen (803) 725-2889 DOE Announces Record Of Decision On SRS High-Level Waste Tank Closure Flag Ribbon Art AIKEN, SC -- The U.S. Department of Energy (DOE) announced that it has selected the Stabilize Tanks and Fill with Grout preferred alternative for additional closures of high-level waste tanks at the Savannah River Site (SRS). The Department's decision is outlined in a Record of Decision (ROD) published in today's Federal Register. An Environmental Impact

  13. SR0206

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    17, 2002 Media Contact: Julie Petersen (803) 725-2889 DOE Announces Conceptual Design Contracts For SRS Salt Waste Processing Facility Flag Ribbon Art Aiken, SC - Today the Department of Energy (DOE) took the first step in commissioning a Salt Waste Processing Facility (SWPF) at the Savannah River Site (SRS) by awarding two contracts for the facility's conceptual design. The SWPF is intended to process the high-level radioactive waste salt solutions currently stored in underground tanks at SRS.

  14. SR0209

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    4, 2002 Media Contact: Bill Taylor (803) 725-2889 DOE/NNSA to Host Modern Pit Facility Media Availability Flag Ribbon Art U. S. Department of Energy National Nuclear Security Administration (NNSA) representatives will host a media availability at 4 p.m. on Monday, October 28, 2002, to discuss the upcoming public scoping meeting for the development of a Modern Pit Facility. The media availability session will be held at 4 p.m. in the North Augusta Community Center, 101 Brookside Drive, North

  15. SR0301

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    January 31, 2003 Media Contact: Bill Taylor (803) 725-2889 Helicopters to Conduct Equipment Tests Over Savannah River Site During February Flag Ribbon Art U.S. Government helicopters will be visible over the Savannah River Site February 3 - 14. The helicopters, UH-60 "Blackhawks," will be testing radiological monitoring equipment for use by various federal agencies. The tests will be conducted by placing radiological source materials in selected area throughout the Department of

  16. SR0303

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    2, 2003 Media Contact: Julie Petersen (803) 725-2889 Environmental Conference To Showcase Cleanup Technologies Flag Ribbon Art AIKEN, S.C., June 2 -- Approximately 200 professionals from across the United States and Canada will meet in Columbia, South Carolina, June 3-5 to share information on innovative and cost-effective environmental cleanup techniques. The conference-the Environmental Restoration Technology End Users Conference will be at the Sheraton Columbia Convention Center. It is

  17. SR0304

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    12, 2003 Media Contact: Jim Giusti (803) 725-2889 NNSA Official Recognize Rapid Completion Of Key Tritium Processing Components Flag Ribbon Art AIKEN, S.C. (June 12)- Dr. Everet Beckner, Deputy Administrator for Defense Programs, of the National Nuclear Security Administration congratulated more than 200 craftsmen and other personnel who fabricated and installed the internals of the first two "gloveboxes" of the Site's new Tritium Extraction Facility, or TEF. This important work was

  18. SR0501

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    14, 2005 Media Contact: James Giusti (803) 952-7697 End State Vision at Savannah River Site Made Public Flag Ribbon Art Aiken, S.C. - The Department of Energy's Savannah River Operations Office issued the draft Savannah River Site (SRS) End State Vision Document for review and comment on Wednesday (March 9, 2005). The SRS End State Vision Document is a concise guide to current conditions at SRS and the conditions the Department plans to achieve through the Site's Environmental Management (EM)

  19. SR0503

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    14, 2005 Media Contact: James Giusti (803) 952-7697 NNSA Breaks Ground On MOX Facility Site Preparation Begins at Savannah River Site Flag Ribbon Art Aiken, S.C. - The National Nuclear Security Administration's (NNSA) plutonium disposition program today moved another step forward with the start of site preparation for its Mixed Oxide (MOX) Fuel Fabrication Facility at the Savannah River Site. NNSA Administrator Linton F. Brooks and U.S. Senator Lindsey Graham led a group of U.S. and Russian

  20. SR0505

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    1, 2005 Media Contact: James Giusti (803) 952-7697 Subcontract Awarded for MOX Facility Site Preparation Work Flag Ribbon Art Aiken, S.C. - The National Nuclear Security Administration's (NNSA) plutonium disposition program has moved another step forward with the start of site preparation for its Mixed Oxide (MOX) Fuel Fabrication Facility at the Savannah River Site. NNSA announced today that the first subcontract for this work has been awarded to MDM Services Corporation, a small business

  1. SR0601

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    May 4, 2006 Media Contact: James Giusti (803) 952-7697 SRS Makes 200th Shipment of Low Enriched Uranium AIKEN, S.C. -- A joint National Nuclear Security Administration and Office of Environmental Management nonproliferation program at the Savannah River Site (SRS) completed its 200th shipment of low enriched uranium (LEU) to Erwin, TN, earlier today. This is the final step at SRS in the process of turning weapons-grade uranium into electricity. Under SRS' Highly Enriched Uranium (HEU) Blend Down

  2. SR0603

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    July 10, 2006 Media Contact: Julie Petersen (803) 952-7697 Startup of Second Nuclear Waste Storage Facility at the Savannah River Site DOE Managed Small Business Contract Safely Completed Ahead of Schedule and Under Budget Aiken , S.C. – The U.S. Department of Energy (DOE) today started radioactive operations of its Glass Waste Storage Building #2 (GWSB#2) at the Savannah River Site (SRS). This facility will safely store waste once processed into a glassified form in the Defense Waste

  3. SR0604

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    DOE Safely Reaches DNFSB Stabilization Milestone AIKEN, S.C., (October 5, 2006) – The Department of Energy announced today that it reached a major safety milestone in nuclear materials stabilization recently when the Savannah River Site stabilized the last of the materials identified under Defense Nuclear Facilities Safety Board (DNFSB) recommendations. “This accomplishment fulfills DNFSB’s 94-1 and 2000-1 recommendations and is indicative of the Department's commitment to safe facility

  4. SR0605

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    DOE’s SRS Disposes of its 20,000th Drum of TRU Waste AIKEN, S.C., (October 5, 2006) – The Department of Energy (DOE) announced today the safe disposal of 20,000 drums of transuranic waste previously stored at its Savannah River Site (SRS) with a recent shipment to the Waste Isolation Pilot Plant (WIPP), in New Mexico. Until recently, these drums were covered with mounds of earth at SRS’s central waste management facility. The drums were generated during decades of nuclear operations at SRS.

  5. SR0606

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    31, 2006 Media Contact: James Giusti (803) 952-7697 DOE Issues Draft Request for Proposals for Savannah River Site Contractor WASHINGTON , DC -- The Department of Energy (DOE) today announced solicitation of comments on a draft Request for Proposals (RFP) for the competitive selection of a management and operating (M&O) contractor for the Savannah River Site (SRS). DOE is issuing the draft RFP in order to facilitate competition by providing potential offerors with the maximum opportunity to

  6. SR0608

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    30, 2006 Media Contact: James Giusti (803) 952-7697 Assistant Secretary for Environmental Management Marks SRS Achieving First Area Closure AIKEN, S.C., – With the completion of remediation work at the U.S. Department of Energy (DOE) Savannah River Site’s (SRS) T Area, SRS has achieved its first area closure, transforming a former industrial area into a grassy hill. T Area is the first area at SRS closed under an “area closure” concept endorsed by the U.S. Environmental Protection Agency and

  7. SR0701?

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    8, 2007 Media Contact: James Giusti (803) 952-7697 james-r.giusti@srs.gov DOE Issues Draft Request for Proposals for SRS Liquid Waste Contract WASHINGTON , DC -- The U.S. Department of Energy (DOE) today announced the release of a draft Request for Proposals (RFP) for the competitive selection of a Liquid Waste (LW) contractor for the Savannah River Site (SRS). The primary facilities related to this procurement include liquid radioactive waste tank farms, the Defense Waste Processing Facility,

  8. SR0703

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    March 23, 2007 Media Contact: James Giusti (803) 952-7697 james-r.giusti@srs.gov DOE Requests Proposals for Management and Operating Contractor at Savannah River Site WASHINGTON , DC -- The U.S. Department of Energy (DOE) today issued its Request for Proposals (RFP) for the competitive selection of a management and operating (M&O) contractor for the Savannah River Site (SRS). The total value of the five-year contract is $4 billion. All proposals are due to the Department no later than May

  9. SR0704

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    3, 2004 Media Contact: Julie Petersen (803) 952-7697 Media Advisory: Media Day On SRS Accelerated Cleanup Flag Ribbon Art NOTE TO EDITORS AND NEWS DIRECTORS: AIKEN, S.C. (July 13, 2004)-Congressman J. Gresham Barrett will join senior officials of the U.S. Department of Energy-Headquarters (DOE-HQ) at the Savannah River Site (SRS) on Monday, July 19, 2004, to discuss the Site's accelerated cleanup activities. DOE-HQ officials include: Lee Otis, DOE General Counsel; Jill Sigal, DOE Principal

  10. SR0704

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    April 13, 2007 Media Contact: Julie Petersen (803) 952-7697 julie.petersen@srs.gov Savannah River Site Employees Honored with President’s Volunteer Service Award AIKEN, S.C., – The U.S. Department of Energy (DOE) has honored several Savannah River Site (SRS) employees with the President’s Volunteer Service Award (PVSA) for their notable volunteerism and civic participation. “It is an honor to be part of a work family whose members give so selflessly to help make a positive difference in