Raman spectroscopic studies of the vario
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H. Poulet; J. P. Mathieu
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Article
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1976
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John Wiley and Sons
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English
⚖ 259 KB
## Abstract Raman spectra of oriented single crystals of (NH~4~)~2~SiF~6~ are reported for the temperature range 440–20 K. The trigonal phase stable below 278 K undergoes a transition at 38.6 K. The changes in the spectra show that the symmetry does not remain trigonal, but give evidence for a lowe