Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 407, Issue 1-2, Pages 44-48Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2005.06.030
Keywords
BaHfO3; perovskite; thermal expansion coefficient; Debye temperature; heat capacity; thermal conductivity; thermal barrier coating
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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 x 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(-1)K(-1). (c) 2005 Elsevier B.V. All rights reserved.
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