High-pressure high-temperature phase diagram of gadolinium studied using a boron-doped heater anvil
Abstract
A boron-doped designer heater anvil is used in conjunction with powder x-ray diffraction to collect structural information on a sample of quasi-hydrostatically loaded gadolinium metal up to pressures above 8 GPa and 600 K. The heater anvil consists of a natural diamond anvil that has been surface modified with a homoepitaxially-grown chemical-vapor-deposited layer of conducting boron-doped diamond, and is used as a DC heating element. Internally insulating both diamond anvils with sapphire support seats allows for heating and cooling of the high pressure area on the order of a few tens of seconds. This device is then used to scan the phase diagram of the sample by oscillating the temperature while continuously increasing the externally applied pressure and collecting in situ time-resolved powder diffraction images. In the pressure-temperature range covered in the experiment the gadolinium sample is observed in its hcp, αSm, and dhcp phases. Under this temperature cycling, the hcp→αSm transition proceeds in discontinuous steps at points along the expected phase boundary. Additionally, the unit cell volumes of each phase deviate from the expected thermal expansion behavior just before each transition is observed from the diffraction data. From these measurements (representing only one hour of synchrotron x-ray collection time),more »
- Authors:
-
- Univ. of Alabama at Birmingham, Birmingham, AL (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Univ. of Alabama, Birmingham, AL (United States); Carnegie Institution of Washington, Washington, D.C. (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1364614
- Alternate Identifier(s):
- OSTI ID: 1246186
- Grant/Contract Number:
- NA0002014; NA0002006
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 119; Journal Issue: 13; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 42 ENGINEERING
Citation Formats
Montgomery, J. M., Samudrala, G. K., Velisavljevic, N., and Vohra, Y. K. High-pressure high-temperature phase diagram of gadolinium studied using a boron-doped heater anvil. United States: N. p., 2016.
Web. doi:10.1063/1.4945704.
Montgomery, J. M., Samudrala, G. K., Velisavljevic, N., & Vohra, Y. K. High-pressure high-temperature phase diagram of gadolinium studied using a boron-doped heater anvil. United States. https://doi.org/10.1063/1.4945704
Montgomery, J. M., Samudrala, G. K., Velisavljevic, N., and Vohra, Y. K. 2016.
"High-pressure high-temperature phase diagram of gadolinium studied using a boron-doped heater anvil". United States. https://doi.org/10.1063/1.4945704. https://www.osti.gov/servlets/purl/1364614.
@article{osti_1364614,
title = {High-pressure high-temperature phase diagram of gadolinium studied using a boron-doped heater anvil},
author = {Montgomery, J. M. and Samudrala, G. K. and Velisavljevic, N. and Vohra, Y. K.},
abstractNote = {A boron-doped designer heater anvil is used in conjunction with powder x-ray diffraction to collect structural information on a sample of quasi-hydrostatically loaded gadolinium metal up to pressures above 8 GPa and 600 K. The heater anvil consists of a natural diamond anvil that has been surface modified with a homoepitaxially-grown chemical-vapor-deposited layer of conducting boron-doped diamond, and is used as a DC heating element. Internally insulating both diamond anvils with sapphire support seats allows for heating and cooling of the high pressure area on the order of a few tens of seconds. This device is then used to scan the phase diagram of the sample by oscillating the temperature while continuously increasing the externally applied pressure and collecting in situ time-resolved powder diffraction images. In the pressure-temperature range covered in the experiment the gadolinium sample is observed in its hcp, αSm, and dhcp phases. Under this temperature cycling, the hcp→αSm transition proceeds in discontinuous steps at points along the expected phase boundary. Additionally, the unit cell volumes of each phase deviate from the expected thermal expansion behavior just before each transition is observed from the diffraction data. From these measurements (representing only one hour of synchrotron x-ray collection time), a single-experiment equation of state and phase diagram of each phase of gadolinium is presented for the range of 0 - 10 GPa and 300 - 650 K.},
doi = {10.1063/1.4945704},
url = {https://www.osti.gov/biblio/1364614},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 13,
volume = 119,
place = {United States},
year = {Thu Apr 07 00:00:00 EDT 2016},
month = {Thu Apr 07 00:00:00 EDT 2016}
}
Web of Science
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