Thermophysical properties of BaThO3

Thermophysical properties of barium thorium trioxide (BaThO3) prepared by the solid-state reaction method were studied. The average linear thermal expansion coefficient of BaThO3 measured in the temperature range of room temperature to 1073 K was estimated as α = 11.9 × 10−6 K−1 by using a high-temperature X-ray diffraction technique. The longitudinal sound velocity, shear sound velocity, and thermal diffusivity of BaThO3 were measured. Further, the shear modulus, Young's modulus, bulk modulus and Debye temperature were evaluated from the measured sound velocities. Using the laser flash technique, the thermal diffusivity of BaThO3 was measured in the temperature range of room temperature to 1073 K. The thermal conductivity of BaThO3 was evaluated from the heat capacity, thermal diffusivity, and density to be 2.3-3.4 Wm−1 K−1 in the temperature range of room temperature to 1073 K.