Abstract
In this work we report results of Raman scattering study on Cs4W11O35
and Rb4W11O35 in the 30-295 K temperature range. Changes in the Raman
spectra indicated presence of two structural phase transformations in
the Cs4W11O35 (Rb4W11O35) system taking place at 110 K (100 K) and 165 K
(210 K). These transformations lead to symmetry increase on cooling.
Temperature dependence of Raman linewidths indicated larger contribution
of an orientational mechanism in Cs4W11O35 than in the Rb4W11O35 system.
No soft-like mode was observed that could point to a displacive type
behavior at the phase transitions. Additional Raman scattering
measurements were performed on the Cs4W11O35 system in the 300-820 K
range. No temperature-induced phase transitions were observed for this
system above room temperature. (C) 2012 Elsevier Inc. All rights
reserved.
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