Physics and Chemistry of Minerals

, Volume 18, Issue 4, pp 215–223 | Cite as

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

  • Dan J. Durben
  • George H. Wolf
  • Paul F. McMillan


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.


Melting Point Perovskite Raman Spectrum Mineral Resource Material Processing 
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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Dan J. Durben
    • 1
  • George H. Wolf
    • 1
  • Paul F. McMillan
    • 1
  1. 1.Arizona State UniversityTempeUSA

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