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Title: New high-pressure phase and equation of state of Ce[subscript 2]Zr[subscript 2]O[subscript 8]

Abstract

In this paper we report a new high-pressure rhombohedral phase of Ce{sub 2}Zr{sub 2}O{sub 8} observed in high-pressure angle-dispersive x-ray diffraction and Raman spectroscopy studies up to nearly 12 GPa. The ambient-pressure cubic phase of Ce{sub 2}Zr{sub 2}O{sub 8} transforms to a rhombohedral structure beyond 5 GPa with a feeble distortion in the lattice. The pressure evolution of the unit-cell volume showed a change in compressibility above 5 GPa. The unit-cell parameters of the high-pressure rhombohedral phase at 12.1 GPa are a{sub h} = 14.6791(3) {angstrom}, c{sub h} = 17.9421(5) {angstrom}, and V = 3348.1(1) {angstrom}{sup 3}. The structure relations between the parent cubic (P2{sub 1}3) and rhombohedral (P3{sub 2}) phases were obtained via group-subgroup relations. All the Raman modes of the cubic phase showed linear evolution with pressure, with the hardest one at 197 cm{sup -1}. Some Raman modes of the high-pressure phase have a non-linear evolution with pressure, and softening of one low-frequency mode with pressure is found. The compressibility, equation of state, and pressure coefficients of Raman modes of Ce{sub 2}Zr{sub 2}O{sub 8} are also reported.

Authors:
; ; ; ; ; ;  [1];  [2];  [2]
  1. (UNLV)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGN
OSTI Identifier:
1047323
Resource Type:
Journal Article
Journal Name:
J. Appl. Phys.
Additional Journal Information:
Journal Volume: 111; Journal Issue: (5) ; 03, 2012; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; CERIUM COMPOUNDS; COMPRESSIBILITY; EQUATIONS OF STATE; PRESSURE COEFFICIENT; PRESSURE RANGE GIGA PA; RAMAN SPECTROSCOPY; VOLUME; X-RAY DIFFRACTION; ZIRCONIUM OXIDES

Citation Formats

Errandonea, D., Kumar, R.S., Achary, S.N., Gomis, O., Manjón, F.J., Shukla, R., Tyagi, A.K., Valencia), and BARC). New high-pressure phase and equation of state of Ce[subscript 2]Zr[subscript 2]O[subscript 8]. United States: N. p., 2012. Web. doi:10.1063/1.3692807.
Errandonea, D., Kumar, R.S., Achary, S.N., Gomis, O., Manjón, F.J., Shukla, R., Tyagi, A.K., Valencia), & BARC). New high-pressure phase and equation of state of Ce[subscript 2]Zr[subscript 2]O[subscript 8]. United States. doi:10.1063/1.3692807.
Errandonea, D., Kumar, R.S., Achary, S.N., Gomis, O., Manjón, F.J., Shukla, R., Tyagi, A.K., Valencia), and BARC). Wed . "New high-pressure phase and equation of state of Ce[subscript 2]Zr[subscript 2]O[subscript 8]". United States. doi:10.1063/1.3692807.
@article{osti_1047323,
title = {New high-pressure phase and equation of state of Ce[subscript 2]Zr[subscript 2]O[subscript 8]},
author = {Errandonea, D. and Kumar, R.S. and Achary, S.N. and Gomis, O. and Manjón, F.J. and Shukla, R. and Tyagi, A.K. and Valencia) and BARC)},
abstractNote = {In this paper we report a new high-pressure rhombohedral phase of Ce{sub 2}Zr{sub 2}O{sub 8} observed in high-pressure angle-dispersive x-ray diffraction and Raman spectroscopy studies up to nearly 12 GPa. The ambient-pressure cubic phase of Ce{sub 2}Zr{sub 2}O{sub 8} transforms to a rhombohedral structure beyond 5 GPa with a feeble distortion in the lattice. The pressure evolution of the unit-cell volume showed a change in compressibility above 5 GPa. The unit-cell parameters of the high-pressure rhombohedral phase at 12.1 GPa are a{sub h} = 14.6791(3) {angstrom}, c{sub h} = 17.9421(5) {angstrom}, and V = 3348.1(1) {angstrom}{sup 3}. The structure relations between the parent cubic (P2{sub 1}3) and rhombohedral (P3{sub 2}) phases were obtained via group-subgroup relations. All the Raman modes of the cubic phase showed linear evolution with pressure, with the hardest one at 197 cm{sup -1}. Some Raman modes of the high-pressure phase have a non-linear evolution with pressure, and softening of one low-frequency mode with pressure is found. The compressibility, equation of state, and pressure coefficients of Raman modes of Ce{sub 2}Zr{sub 2}O{sub 8} are also reported.},
doi = {10.1063/1.3692807},
journal = {J. Appl. Phys.},
issn = {0021-8979},
number = (5) ; 03, 2012,
volume = 111,
place = {United States},
year = {2012},
month = {10}
}