NDLI: Raman Spectra and Phase Transitions in the Rb 2 KScF 6 Elpasolite

Content Provider	Semantic Scholar
Author	Krylov, Alexander S. Vtyurin, A. N. Bulou, Alain Voronov, Victor
Copyright Year	2003
Abstract	Raman spectra of Rb 2 KScF 6 elpasolite crystal have been studied in a wide temperature range, including two transition points: from cubic to tetragonal, and then--to the monoclinic phase. For the first time both for this crystal and for fluoride elpasolites in general soft modes restoration has been found below transition points; in agreement with selection rules a splitting of degenerate modes has been observed as well both for lattice vibrations and internal modes of ScF 6 octahedrons. Parameters of Raman lines have been quantitatively analyzed and found in good agreement with known thermodynamic characteristics of these transitions; in particular, lines widths are shown to be determined by tree-phonons anharmonic interactions. A wide region of pretransitional fluctuations was found above the upper transition point.
Starting Page	47
Ending Page	64
Page Count	18
File Format	PDF HTM / HTML
DOI	10.1080/00150190390204709
Volume Number	284
Alternate Webpage(s)	http://www.ioffe.ru/RCBJSF/abstr/sf_p026.pdf
Alternate Webpage(s)	https://doi.org/10.1080/00150190390204709
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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