2007 Volume 14 Issue 327 Pages 98-103
Raman spectra of BaTa2O6 have been successfully obtained at temperatures up to 1573 K for the first time, using a continuous-wave ultraviolet Raman spectroscopic system designed to measure the Raman scattering from materials at high temperature. The typical Raman spectra of the orthorhombic phase (Type I) were recorded in the region of room temperature to 1573 K. The present result is described in terms of the parameter related to temperature variation at constant pressure, defined in a similar way to the Gruneisen parameter. Raman bands located above 250 cm -1 and the mode at 169 cm -1 show smaller values of the parameter than lower frequency modes below 250 cm -1 except the mode at 169 cm-1, suggesting that these higher frequency modes and the mode at 169 cm-1 are assigned to TaO6 internal modes.
