Abstract
Thermomechanical properties of fine-grained, 96% dense, polycrystalline BaZrO 3 specimens were studied. The average thermal expansion coefficient of BaZrO 3 at 25–1000°C was 7.72×10 −6°C −1. At 25°C, Young's modulus was 240.5 GPa and the shear modulus was 97.2 GPa. These values decreased by ≈10% with heating to 1015°C. Poisson's ratio was 0.237 and was independent of temperature. The BaZrO 3 specimens exhibited a thermal expansion coefficient of about one half, and elastic moduli more than twice, those of polycrystalline high-temperature superconductors. Diffusional creep was observed when BaZrO 3 was compressed at 1300–1400°C; the activation energy for steady-state deformation was 460±30 kJ/mole. The mechanism was probably grain-boundary sliding, controlled by diffusion of one of the cations along grain boundaries. Deformation rates below 1000°C were too low to relax thermally generated stresses.
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