Anisotropic thermal properties of the polar crystal Cs2TeMo3O12

A Cs2TeMo3O12 single crystal with dimensions of 17 mm x 17 mm x 18 mm was grown using the top-seeded solution growth method. Thermal properties, including thermal expansion, specific heat, thermal diffusivity and thermal conductivity, were investigated as a function of temperature. The average linear thermal expansion coefficients along different crystallographic directions were measured to be alpha(a) = 7.34 x 10(-6) K-1 and alpha(c) = 32.02 x 10(-6) K-1 over the temperature range of 30-430 degrees C. The specific heat was measured to be 0.400-0.506 Jg(-1) K-1 from 22 degrees C to 440 degrees C. The thermal conductivity was calculated to be 1.86 and 0.76 W m(-1) K-1 at 22 degrees C along the a and c axes, respectively. With increasing temperature from 22 to 430 degrees C, the thermal conductivity decreases by 33.0% along the a axis, while it decreases by 18.5% below 200 degrees C and then remains unchanged along the c axis. The relationship between structure and the thermal properties is also discussed. (C) 2011 Elsevier Inc. All rights reserved.