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Title: Comparison of the high-pressure behavior of the cerium oxides C e 2 O 3 and Ce O 2

Abstract

The high pressure behavior of Ce2O3 was studied using angle dispersive X-ray diffraction to 70 GPa and compared with that of CeO2. Up to the highest pressure Ce2O3 remains in the hexagonal phase (space group 164, P-32/m1) typical for the lanthanide sesquioxides. A theoretically predicted phase instability for 30 GPa is not observed. The isothermal bulk modulus and its pressure derivative for the quasi-hydrostatic case are B0 = 111 ± 2 GPa, B0’ = 4.7 ± 0.3 and for the case without pressure transmitting medium B0 = 104 ± 4 GPa, B0’ = 6.5 ± 0.4. Starting from ambient pressure magnetic susceptibility measurements for both oxides in highly purified form we find that the Ce atom in Ce2O3 behaves like a trivalent Ce3+ ion (2.57 μB per Ce atom) in contrast to previously published data. Since X-ray emission spectroscopy of the Lγ (4d3/2 → 2p1/2) transition is sensitive to the 4f-electron occupancy, we also followed the high-pressure dependence of this line for both oxides up to 50 GPa. No change of the respective lineshape was observed, indicating that the 4f-electron configuration is stable for both materials. We posit from this data that the 4f-electrons do not drive the volume collapsemore » of CeO2 from the high-symmetry, low-pressure fluorite structure to the lower-symmetry orthorhombic phase.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3];  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Washington, Seattle, WA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Carnegie Inst. of Science, Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1240965
Alternate Identifier(s):
OSTI ID: 1237507; OSTI ID: 1379168
Report Number(s):
LLNL-JRNL-675872
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC52-07NA27344; FG02- 09ER16106; SC0008580; AC52- 07NA27344; FG02-09ER16106; AC02-06CH11357; NA0001974; NA0002006
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Lipp, M. J., Jeffries, J. R., Cynn, H., Park Klepeis, J. -H., Evans, W. J., Mortensen, D. R., Seidler, G. T., Xiao, Y., and Chow, P. Comparison of the high-pressure behavior of the cerium oxides Ce2O3 and CeO2. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.064106.
Lipp, M. J., Jeffries, J. R., Cynn, H., Park Klepeis, J. -H., Evans, W. J., Mortensen, D. R., Seidler, G. T., Xiao, Y., & Chow, P. Comparison of the high-pressure behavior of the cerium oxides Ce2O3 and CeO2. United States. doi:https://doi.org/10.1103/PhysRevB.93.064106
Lipp, M. J., Jeffries, J. R., Cynn, H., Park Klepeis, J. -H., Evans, W. J., Mortensen, D. R., Seidler, G. T., Xiao, Y., and Chow, P. Tue . "Comparison of the high-pressure behavior of the cerium oxides Ce2O3 and CeO2". United States. doi:https://doi.org/10.1103/PhysRevB.93.064106. https://www.osti.gov/servlets/purl/1240965.
@article{osti_1240965,
title = {Comparison of the high-pressure behavior of the cerium oxides Ce2O3 and CeO2},
author = {Lipp, M. J. and Jeffries, J. R. and Cynn, H. and Park Klepeis, J. -H. and Evans, W. J. and Mortensen, D. R. and Seidler, G. T. and Xiao, Y. and Chow, P.},
abstractNote = {The high pressure behavior of Ce2O3 was studied using angle dispersive X-ray diffraction to 70 GPa and compared with that of CeO2. Up to the highest pressure Ce2O3 remains in the hexagonal phase (space group 164, P-32/m1) typical for the lanthanide sesquioxides. A theoretically predicted phase instability for 30 GPa is not observed. The isothermal bulk modulus and its pressure derivative for the quasi-hydrostatic case are B0 = 111 ± 2 GPa, B0’ = 4.7 ± 0.3 and for the case without pressure transmitting medium B0 = 104 ± 4 GPa, B0’ = 6.5 ± 0.4. Starting from ambient pressure magnetic susceptibility measurements for both oxides in highly purified form we find that the Ce atom in Ce2O3 behaves like a trivalent Ce3+ ion (2.57 μB per Ce atom) in contrast to previously published data. Since X-ray emission spectroscopy of the Lγ (4d3/2 → 2p1/2) transition is sensitive to the 4f-electron occupancy, we also followed the high-pressure dependence of this line for both oxides up to 50 GPa. No change of the respective lineshape was observed, indicating that the 4f-electron configuration is stable for both materials. We posit from this data that the 4f-electrons do not drive the volume collapse of CeO2 from the high-symmetry, low-pressure fluorite structure to the lower-symmetry orthorhombic phase.},
doi = {10.1103/PhysRevB.93.064106},
journal = {Physical Review B},
number = 6,
volume = 93,
place = {United States},
year = {2016},
month = {2}
}

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    Works referencing / citing this record:

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