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

Academic Article

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 -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 ±-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. © 1988 The American Physical Society.
  • Authors

    Published In

    Digital Object Identifier (doi)

    Pubmed Id

  • 15156895
  • Author List

  • Duclos SJ; Vohra YK; Ruoff AL; Jayaraman A; Espinosa GP
  • Start Page

  • 7755
  • End Page

  • 7758
  • Volume

  • 38
  • Issue

  • 11