Vibrational spectra of solid solution series with ordered perovskite structure

Abstract

I.R. and Raman spectra are reported for the following three systems: Ba2CaMo1−xTexO6, Ba2−xSrxMgWO6 and Ba2Ca1−xMgxWO6. In the first series the internal vibrations of the M6+O6 octahedra do not influence each other. The intensity of ν1 (MoO6) is five times that of ν1 (TeO6). In the second system there is a gradual, but no linear variation with the composition parameter x. In the third system selection rules are lifted and new bands appear. Where possible these changes in the spectra are related to the structure of the compositions.