2011/05/02 by V. Panchal, R. S. Kumar, S. López‐Moreno +14
Earth and Planetary Sciences · Physics and Astronomy · #Advanced Condensed Matter Physics #Geological and Geochemical Analysis #High-pressure geophysics and materials #cond-mat.mtrl-sci #physics.chem-ph #physics.geo-ph
paper · pdf · doi:10.1103/physrevb.84.024111
published as Physical Review B 84, 024111 (2011) · 28 pages, 6 figures, 38 references
openalex publication_date 2011/07/07 · arxiv created 2012/01/25 · arxiv updated 2012/01/26 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
X-ray diffraction and Raman-scattering measurements on cerium vanadate have been performed up to 12 and 16 GPa, respectively. Experiments reveal at 5.3 GPa the onset of a pressure-induced irreversible phase transition from the zircon to the monazite structure. Beyond this pressure, diffraction peaks and Raman-active modes of the monazite phase are measured. The zircon-to-monazite transition in CeVO4 is distinctive among the other rare-earth orthovanadates. We also observed softening of external translational T(Eg) and internal \ensuremathν2(B2g) bending modes. We attribute it to mechanical instabilities of zircon phase against the pressure-induced distortion. We additionally report lattice-dynamical and total-energy calculations which are in agreement with the experimental results. Finally, the effect of nonhydrostatic stresses on the structural sequence is studied and the equations of state of different phases are reported.