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

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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.

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Authors and Affiliations

  1. Arizona State University, 85287-1604, Tempe, AZ, USA

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

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  1. Dan J. Durben
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  2. George H. Wolf
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  3. Paul F. McMillan
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Durben, D.J., Wolf, G.H. & McMillan, P.F. Raman scattering study of the high-temperature vibrational properties and stability of CaGeO3 perovskite. Phys Chem Minerals 18, 215–223 (1991). https://doi.org/10.1007/BF00202573

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  • DOI: https://doi.org/10.1007/BF00202573

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