This article is cited in 20 papers

Lattice dynamics

Structural transformations in LiGd$_9$(SiO$_4$)$_6$O$_2$ and Ca$_2$Gd$_8$(SiO$_4$)$_6$O$_2$ crystals containing isolated [SiO$_4$] complexes: Raman spectroscopic study

Yu. K. Voronko, A. A. Sobol, V. E. Shukshin, A. I. Zagumennyi, Yu. D. Zavartsev, S. A. Kutovoi

Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow

Abstract: The vibrational spectra of single crystals of the LiGd$_9$(SiO$_4$)$_6$O$_2$ and Ca$_2$Gd$_8$(SiO$_4$)$_6$O$_2$ oxyapatites have been studied using Raman spectroscopy at room and high temperatures. The spectra of internal and external vibrations in these structures have been resolved. The structural transformation of the LiGd$_9$(SiO$_4$)$_6$O$_2$ and Ca$_2$Gd$_8$(SiO$_4$)$_6$O$_2$ oxyapatites in the processes of melting and crystallization, as well as during rapid quenching of the melt, has been investigated. It has been found that the melting of the LiGd$_9$(SiO$_4$)$_6$O$_2$ compound has an incongruent character and that new metastable disordered phases are formed during rapid quenching of the Ca$_2$Gd$_8$(SiO$_4$)$_6$O$_2$ melt.

Received: 17.01.2012

 English version: Physics of the Solid State, 2012, 54:8, 1635–1642

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