High-Temperature Structural Disorder in R3NbO7

Author： Kovyazina S. A.   Perelyaeva L. A.   Leonidov I. A.   Bakhteeva Yu. A.  

Publisher： Springer Publishing Company

ISSN： 0022-4766

Source： Journal of Structural Chemistry, Vol.44, Iss.6, 2003-11, pp. : 975-979

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Abstract

R3NbO7 (R = La, Nd, Gd, Y) niobates have been studied by Raman spectroscopy at 298-973 K. The temperature and composition effects on the structure of these compounds are considered. The changes observed in the Raman spectra at elevated temperatures are caused by a reversible structural disordering due to oxygen redistribution over anion sites.

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