Thermal and mechanical properties of SrHfO 3

Abstract

Polycrystalline samples of the strontium perovskite type oxide, SrHfO 3 have been prepared and the thermal and mechanical properties have been measured. The crystal structure and lattice parameters were evaluated by an X-ray diffraction method. The heat capacity was measured by using a differential scanning calorimeter, DSC, in a high purity argon atmosphere. The thermal diffusivity was measured by a laser flash method in vacuum. The thermal conductivity was evaluated from the heat capacity, thermal diffusivity, and density. The thermal expansion coefficient was evaluated by using high temperature X-ray diffraction in the temperature range from room temperature to about 1000 K under helium atmosphere. The melting point was measured by a thermal arrest method under a reduction atmosphere. 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 hardness measurements were performed at room temperature in air, using a micro-Vickers hardness tester. The relationships between the properties of the perovskite type oxide were studied.