High-pressure x-ray diffraction study of CeO2 to 70 GPa and pressure-induced phase transformation from the fluorite structure

Duclos, Steven J. ; Vohra, Yogesh K. ; Ruoff, Arthur L. ; Jayaraman, A. ; Espinosa, G. P. (1988) High-pressure x-ray diffraction study of CeO2 to 70 GPa and pressure-induced phase transformation from the fluorite structure Physical Review B, 38 (11). pp. 7755-7758. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v38/i11/p7755_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.38.7755

Abstract

The crystal structure of CeO2 has been investigated to 70 GPa using energy dispersive x-ray diffraction in a diamond-anvil cell. At 31.5±1.0 GPa the fluorite phase transforms, on loading, to an orthorhombic α-PbCl2-like structure of space group Pnam, with a 7.5%±0.7% increase in density. The cubic fluorite phase has a bulk modulus B0=230±10 GPa with an assumed pressure derivative of B0'=4.00. The α-PbCl2-type structure seems to be the stable high-pressure phase in the case of the group-IVB, lanthanide, and actinide fluorite-type dioxides, independent of metal-ion size, at reduced volumes less than 0.89±0.01.

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ID Code:13305
Deposited On:11 Nov 2010 08:10
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