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

Journal Article · Wed Oct 24 04:00:00 EDT 2012 · J. Appl. Phys.

DOI:https://doi.org/10.1063/1.3692807· OSTI ID:1047323

Errandonea, D; Kumar, R S; Achary, S N; Gomis, O; Manjón, F J; Shukla, R; Tyagi, A K ^[1]

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1. UNLV

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.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: FOREIGN
• OSTI ID: 1047323
• Journal Information: J. Appl. Phys., Journal Name: J. Appl. Phys. Journal Issue: (5) ; 03, 2012 Vol. 111; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
CERIUM COMPOUNDS
COMPRESSIBILITY
EQUATIONS OF STATE
PRESSURE COEFFICIENT
PRESSURE RANGE GIGA PA
RAMAN SPECTROSCOPY
VOLUME
X-RAY DIFFRACTION
ZIRCONIUM OXIDES