Abstract
In the present study, a series of Sm2(Hf1-xCex)2O7 ceramics were fabricated by solid-state reaction method, and their structural and thermophysical properties were studied. The results indicated that all the Sm2(Hf1-xCex)2O7 oxides exhibited a single fluorite-type structure, except for Sm2Hf2O7 which showed a pyrochlore structure. Because of the phonon scattering caused by CeO2 doping, the heat conductivity of Sm2(Hf1-xCex)2O7 was reduced. The thermal expansion coefficient was also reduced owing to the relatively low electronegativity of Ce4+ ions. The heat-physical properties of the obtained ceramics met the basic requirements of thermal barrier coatings.
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