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

Journal Article · · Physical Review B
 [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)

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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Carnegie Inst. of Science, Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; FG02- 09ER16106; SC0008580; AC52- 07NA27344; FG02-09ER16106; AC02-06CH11357; NA0001974; NA0002006
OSTI ID:
1240965
Alternate ID(s):
OSTI ID: 1237507; OSTI ID: 1379168
Report Number(s):
LLNL-JRNL-675872; PRBMDO
Journal Information:
Physical Review B, Vol. 93, Issue 6; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (7)

Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice journal October 2019
Pressure-induced tuning of lattice distortion in a high-entropy oxide journal September 2019
Anomalous compression behaviour in Nd 2 O 3 studied by x-ray diffraction and Raman spectroscopy journal February 2018
High-pressure studies with x-rays using diamond anvil cells journal November 2016
Pressure-Induced Phase Transitions in Sesquioxides journal November 2019
Pressure-induced tuning of lattice distortion in a high-entropy oxide text January 2019
Defect engineering by synchrotron radiation X-rays in CeO 2 nanocrystals text January 2018

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