Thermionic emission microscopy of scandium thin film dewetting on W(100)

Mroz, Michael; Tenney, Samuel; Savina, Tatiana; Kordesch, Martin E.

doi:10.1063/1.5039612

Title: Thermionic emission microscopy of scandium thin film dewetting on W(100)

Abstract

Scandium thin films of 5-30 nm thickness deposited on clean W(100) surfaces de-wet from the tungsten surface when heated to temperatures < 0.5 T_melt. The dewetting temperature and the resulting droplet size are a function of the initial scandium film thickness.

Authors:

Mroz, Michael ^[1];

^[2]; Savina, Tatiana ^[3];

^[1]

Ohio Univ., Athens, OH (United States). Dept. of Physics
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Ohio Univ., Athens, OH (United States). Dept. of Mathematics

Publication Date:: Mon Jun 18 00:00:00 EDT 2018

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1462411

Alternate Identifier(s):: OSTI ID: 1454656

Report Number(s):: BNL-207885-2018-JAAM
Journal ID: ISSN 2158-3226; TRN: US1902168

Grant/Contract Number:: SC0012704; N66001-16-1-4040

Resource Type:: Accepted Manuscript

Journal Name:: AIP Advances

Additional Journal Information:: Journal Volume: 8; Journal Issue: 6; Journal ID: ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Mroz, Michael, Tenney, Samuel, Savina, Tatiana, and Kordesch, Martin E. Thermionic emission microscopy of scandium thin film dewetting on W(100).  United States: N. p., 2018. 
Web.  doi:10.1063/1.5039612.

Copy to clipboard


                    Mroz, Michael, Tenney, Samuel, Savina, Tatiana, & Kordesch, Martin E. Thermionic emission microscopy of scandium thin film dewetting on W(100).  United States.  https://doi.org/10.1063/1.5039612

Copy to clipboard


                    Mroz, Michael, Tenney, Samuel, Savina, Tatiana, and Kordesch, Martin E. Mon .  
"Thermionic emission microscopy of scandium thin film dewetting on W(100)".  United States.  https://doi.org/10.1063/1.5039612.  https://www.osti.gov/servlets/purl/1462411.

Copy to clipboard


                    
@article{osti_1462411,

  title        = {Thermionic emission microscopy of scandium thin film dewetting on W(100)},

  author       = {Mroz, Michael and Tenney, Samuel and Savina, Tatiana and Kordesch, Martin E.},

  abstractNote = {Scandium thin films of 5-30 nm thickness deposited on clean W(100) surfaces de-wet from the tungsten surface when heated to temperatures < 0.5 Tmelt. The dewetting temperature and the resulting droplet size are a function of the initial scandium film thickness.},

  doi          = {10.1063/1.5039612},

  journal      = {AIP Advances},

  number       = 6,

  volume       = 8,

  place        = {United States},

  year         = {Mon Jun 18 00:00:00 EDT 2018},

  month        = {Mon Jun 18 00:00:00 EDT 2018}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (Publisher)

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1063/1.5039612

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 9 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

Some comments on models for field enhancement
journal, May 2003

Forbes, Richard G.; Edgcombe, C. J.; Valdrè, U.
Ultramicroscopy, Vol. 95
DOI: 10.1016/S0304-3991(02)00297-8

The continuing development of low‐energy electron microscopy for characterizing surfaces
journal, December 1992

Veneklasen, Lee H.
Review of Scientific Instruments, Vol. 63, Issue 12
DOI: 10.1063/1.1143377

Dewetting of patterned solid films: Towards a predictive modelling approach
journal, June 2017

Trautmann, M.; Cheynis, F.; Leroy, F.
Applied Physics Letters, Vol. 110, Issue 26
DOI: 10.1063/1.4990005

Nanostructure Formation by controlled dewetting on patterned substrates: A combined theoretical, modeling and experimental study
journal, September 2016

Lu, Liang-Xing; Wang, Ying-Min; Srinivasan, Bharathi Madurai
Scientific Reports, Vol. 6, Issue 1
DOI: 10.1038/srep32398

Ab initio investigation of barium-scandium-oxygen coatings on tungsten for electron emitting cathodes
journal, February 2010

Vlahos, Vasilios; Booske, John H.; Morgan, Dane
Physical Review B, Vol. 81, Issue 5
DOI: 10.1103/physrevb.81.054207

Work function of alkali-covered W(100)
journal, October 1972

Chen, J. M.; Papageorgopoulos, C. A.
Solid State Communications, Vol. 11, Issue 8
DOI: 10.1016/0038-1098(72)90308-0

Theory of Work-Function Changes Induced by Alkali Adsorption
journal, December 1971

Lang, N. D.
Physical Review B, Vol. 4, Issue 12
DOI: 10.1103/physrevb.4.4234

Sc-W (Scandium-Tungsten)
journal, December 2000

Okamoto, H.
Journal of Phase Equilibria, Vol. 21, Issue 6
DOI: 10.1361/105497100770339572

A model system for scandate cathodes
journal, February 1997

Zagwijn, P. M.; Frenken, J. W. M.; van Slooten, U.
Applied Surface Science, Vol. 111
DOI: 10.1016/s0169-4332(96)00750-7

Model scandate cathodes investigated by thermionic-emission microscopy
journal, July 2011

Kordesch, M. E.; Vaughn, J. M.; Wan, C.
Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, Vol. 29, Issue 4
DOI: 10.1116/1.3589442

Solid-State Dewetting of Thin Films
journal, August 2012

Thompson, Carl V.
Annual Review of Materials Research, Vol. 42, Issue 1
DOI: 10.1146/annurev-matsci-070511-155048

Theory of Work-Function Changes Induced by Alkali Adsorption
journal, March 1972

Lang, N. D.
Journal of Vacuum Science and Technology, Vol. 9, Issue 2
DOI: 10.1116/1.1317720

Similar Records in DOE PAGES and OSTI.GOV collections:

Solid-solid dewetting of scandium thin films on the W(100) surface observed using emission microscopy

Journal Article Mroz, Michael V. ; Savina, Tatiana ; Kordesch, Martin E. ; ... - Journal of Vacuum Science and Technology. B, Nanotechnology and Microelectronics

Here, several operating modes of cathode lens emission microscopy are used to observe scandium on W(100), including mirror microscopy, thermionic emission microscopy, and low energy electron diffraction. Scandium thin films are deposited by thermal evaporation from a metal source onto W(100). The scandium films on W(100) are observed to dewet from the W(100) surface and to form droplets when the surface is heated: the dewetting temperature is thickness dependent and spans a range from 500 to 900 °C, which is far below the melting temperature (1541 °C). Thinner films produce smaller droplets; a range of film thicknesses from 5 tomore »« less
Cited by 6
https://doi.org/10.1116/1.5066015

Full Text Available
A mathematical model of solid-state dewetting of barium thin films on W (112)

Journal Article Knavel, S. A. ; Savina, Tatiana V. ; Mroz, M. V. ; ... - Mathematical Modelling of Natural Phenomena

Solid state dewetting occurs when a thin solid film is heated. The temperature of dewetting depends on the thickness of the film; dewetting can be observed in the range of 1/3 to 1/2 of the bulk melting temperature. While remaining solid, the film behaves in a manner similar to liquids dewetting and agglomerating to forming islands or droplets. One of the possible mechanisms is the conversion of a metastable thin film geometry into a more stable form. Heating the metastable film gives the film atoms higher mobility, and the films retract, dewetting the surface. This atomic motion can be restrictedmore »« less
https://doi.org/10.1051/mmnp/2019040

Full Text Available
Scandium function in “scandate” thermionic cathodes: A microspot synchrotron radiation x-ray photoelectron spectroscopy study of co-adsorbed Ba-Sc-O on W(100)

Journal Article Mroz, Michael V. ; Kordesch, Martin E. ; Sadowski, Jerzy T. - Journal of Vacuum Science and Technology A

The co-adsorption of barium, scandium and oxygen on W(100) was investigated with micro-Synchrotron radiation X-ray Photoelectron Spectroscopy (μ-SRXPS) in the emission microscope at the Electron-Spectro-Microscopy (ESM) beam line at the National Synchrotron Light Source II. The Ba-Sc-0-W(100) system is a model for “scandate” thermionic electron emitters. The barium 4d (Ba4d), tungsten 4f (W4f) and scandium 3p (Sc3p) levels were observed after metal deposition and adsorption of oxygen. The initial deposits of metallic scandium and barium were confirmed with μSRXPS. After oxygen adsorption, the Sc 3p peaks shifted to higher binding energy (by >4 eV), indicating the formation of Sc₂O₃ ormore »« less
Cited by 6
https://doi.org/10.1116/1.5094258

Full Text Available
Correlation of Auger electron spectroscopy and microsynchrotron radiation x-ray photoelectron spectroscopy investigations of Ba-Sc-O desorption on W(100)

Journal Article Mroz, Michael V. ; Kordesch, Martin E. ; Sadowski, Jerzy T. ; ... - Journal of Vacuum Science and Technology B

In this work, thin films of barium and scandium metal were deposited onto W(100) from metal evaporation sources in ultrahigh vacuum. The Ba-Sc-W(100) surface was then exposed to oxygen and heated in stages to several temperatures up to 1400 °C to examine the desorption behavior of these adsorbates. In one case, microsynchrotron radiation x-ray photoelectron spectroscopy (micro-SRXPS) was performed on this surface using a low energy electron microscope. In another experiment, reported here, Auger electron spectroscopy data were collected from the Ba-Sc-O-W(100) surface as a function of heating to temperatures corresponding to the same temperatures used for the micro-SRXPS. Bothmore »« less
https://doi.org/10.1116/1.5134649

Full Text Available
Solid-state dewetting of single- and bilayer Au-W thin films: Unraveling the role of individual layer thickness, stacking sequence and oxidation on morphology evolution

Journal Article Herz, A., E-mail: andreas.herz@tu-ilmenau.de, E-mail: dong.wang@tu-ilmenau.de ; Franz, A. ; Theska, F. ; ... - AIP Advances

Self-assembly of ultrathin Au, W, and Au-W bilayer thin films is investigated using a rapid thermal annealing technique in an inert ambient. The solid-state dewetting of Au films is briefly revisited in order to emphasize the role of initial film thickness. W films deposited onto SiO{sub 2} evolve into needle-like nanocrystals rather than forming particle-like agglomerates upon annealing at elevated temperatures. Transmission electron microscopy reveals that such nanocrystals actually consist of tungsten (VI) oxide (WO{sub 3}) which is related to an anisotropic oxide crystal growth out of the thin film. The evolution of W films is highly sensitive to themore »« less
https://doi.org/10.1063/1.4944348

Similar Records

Title: Thermionic emission microscopy of scandium thin film dewetting on W(100)

Abstract

Citation Formats

Some comments on models for field enhancement journal, May 2003

The continuing development of low‐energy electron microscopy for characterizing surfaces journal, December 1992

Dewetting of patterned solid films: Towards a predictive modelling approach journal, June 2017

Nanostructure Formation by controlled dewetting on patterned substrates: A combined theoretical, modeling and experimental study journal, September 2016

Ab initio investigation of barium-scandium-oxygen coatings on tungsten for electron emitting cathodes journal, February 2010

Work function of alkali-covered W(100) journal, October 1972

Theory of Work-Function Changes Induced by Alkali Adsorption journal, December 1971

Sc-W (Scandium-Tungsten) journal, December 2000

A model system for scandate cathodes journal, February 1997

Model scandate cathodes investigated by thermionic-emission microscopy journal, July 2011

Solid-State Dewetting of Thin Films journal, August 2012

Theory of Work-Function Changes Induced by Alkali Adsorption journal, March 1972

Some comments on models for field enhancement
journal, May 2003

The continuing development of low‐energy electron microscopy for characterizing surfaces
journal, December 1992

Dewetting of patterned solid films: Towards a predictive modelling approach
journal, June 2017

Nanostructure Formation by controlled dewetting on patterned substrates: A combined theoretical, modeling and experimental study
journal, September 2016

Ab initio investigation of barium-scandium-oxygen coatings on tungsten for electron emitting cathodes
journal, February 2010

Work function of alkali-covered W(100)
journal, October 1972

Theory of Work-Function Changes Induced by Alkali Adsorption
journal, December 1971

Sc-W (Scandium-Tungsten)
journal, December 2000

A model system for scandate cathodes
journal, February 1997

Model scandate cathodes investigated by thermionic-emission microscopy
journal, July 2011

Solid-State Dewetting of Thin Films
journal, August 2012

Theory of Work-Function Changes Induced by Alkali Adsorption
journal, March 1972