High-temperature Raman spectra and thermal expansion of wollastonite

Varghese Swamy, Leonid S. Dubrovinsky, Faramarz Tutti

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Abstract

Unpolarized single-crystal Raman spectra in the temperature interval of 298-1235 K and powder X-ray diffractometry data from room temperature up to 1295 K have been obtained from a natural triclinic wollastonite of almost-ideal composition. Room-temperature spectra, along with the temperature dependencies of nine major Raman modes, are presented. The temperature shifts of the Raman modes indicate a discontinuity in the temperature range of 950-980 K. No corresponding changes are observed in the temperature dependencies of the lattice parameters. Thermal expansion coefficients for the lattice parameters in the temperature range of 298-1295 K are given.

Original languageEnglish
Pages (from-to)2237-2247
Number of pages11
JournalJournal of the American Ceramic Society
Volume80
Issue number9
DOIs
Publication statusPublished - Sep 1997
Externally publishedYes

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