Thermophysical properties of perovskite-type strontium cerate zirconate

Polycrystalline samples of strontium series perovskite-type oxides, SrCeO3 and SrZrO3, were prepared and the thermophysical properties were measured. The chemical compositions of the samples do not deviate from the stoichiometric composition. The oxygen-to-metal (O/M) ratios of SrCeO3 and SrZrO3 are 3.00 +/- 0.03 and 2.98 +/- 0.01, respectively. The average linear thermal expansion coefficients are 1.11 x 10(-5) K-1 for SrCeO3 and 9.69 x 10(-6) K-1 for SrZrO3 in the temperature range between 300 and 1000 K. The melting temperatures T-m of SrCeO3 and SrZrO3 are 2266 and 2883 K, respectively. The longitudinal and shear sound velocities were measured by an ultrasonic pulse-echo method at room temperature in air, which enables to evaluate the elastic moduli and Debye temperature. The heat capacity was measured by using a differential scanning calorimeter in high-purity argon atmosphere. The thermal diffusivity was measured by a laser flash method in vacuum. The thermal conductivities of SrCeO3 and SrZrO3 at room temperature are 2.95 and 4.06 W . m(-1) . K-1, respectively.