Raman scattering study of the high-temperature vibrational properties and stability of CaGeO3 perovskite

Dan J. Durben, George Wolf, Paul F. McMillan

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The vibrational properties of metastable Ca-GeO3 perovskite are investigated as a function of temperature using Raman scattering. Mode-assignments are derived from polarized spectra of optically oriented single crystals. Neither symmetry-breaking structural transformations nor soft-mode behavior is revealed in the Raman spectra between room temperature and 650° C. Only a small decrease in the local static octahedral tilt angles can be inferred from the Raman data over this temperature range. A Landau extrapolation of the lowest frequency Ag modes suggests that these modes become critical near 2000° C, a temperature that is above the extrapolated zero pressure melting point.

Original languageEnglish (US)
Pages (from-to)215-223
Number of pages9
JournalPhysics and Chemistry of Minerals
Volume18
Issue number4
DOIs
StatePublished - Dec 1991

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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