Thermal and mechanical properties of perovskite-type barium hafnate |
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| Affiliation: | 1. College of Science, Honghe University, Yunnan Province, 661199, China;2. School of Physics and Optoelectronic Engineering, Ludong University, Yantai, Shandong Province, 264000, China;3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia-30332, USA;4. Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, Karaj- 31787-316, Iran;5. South Ural State University, 76, Lenin Aven., Chelyabinsk, Russia 454080;6. Central Research Laboratory, Esfarayen University of Technology, Esfarayen, Iran |
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| Abstract: | Polycrystalline samples of the barium perovskite-type oxide, BaHfO3 were prepared by solid-state reactions from HfO2 and BaCO3 powders. The thermal expansion coefficient, heat capacity, thermal diffusivity, thermal conductivity, elastic modulus, Debye temperature, and micro-Vickers hardness were measured. The crystal structure of BaHfO3 is of the cubic perovskite type with the lattice parameter 0.4171 nm at room temperature. The sample bulk density is 91% of the theoretical density. The average linear thermal expansion coefficient is 6.93 × 10?6 K?1 in the temperature range between 300 and 1500 K. The Young's modulus equals 194 GPa. The thermal conductivity at room temperature is 10.4 Wm?1K?1. |
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