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

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

doi:10.1007/BF00202573

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

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

Molecular Sciences, School of (SMS)

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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 A_g modes suggests that these modes become critical near 2000° C, a temperature that is above the extrapolated zero pressure melting point.

Original language	English (US)
Pages (from-to)	215-223
Number of pages	9
Journal	Physics and Chemistry of Minerals
Volume	18
Issue number	4
DOIs	https://doi.org/10.1007/BF00202573
State	Published - Dec 1991

ASJC Scopus subject areas

General Materials Science
Geochemistry and Petrology

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title = "Raman scattering study of the high-temperature vibrational properties and stability of CaGeO3 perovskite",

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.",

author = "Durben, {Dan J.} and George Wolf and McMillan, {Paul F.}",

year = "1991",

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AU - Wolf, George

AU - McMillan, Paul F.

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N2 - 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.

AB - 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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JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

IS - 4

ER -

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

Abstract

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