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Ba2(DyxYb1–x)AlO5 ceramics were prepared by solid-state sintering in air for 10 h at 1560 °C.The influence of Dy doping on the thermal physical properties of Ba2YbAlO5 was studied. The phase structure of these ceramics were identified by X-ray diffraction, which indicates that all of these ceramics have a perovskite structure. The thermal physical properties of these ceramics measurement show that the thermal expansion coefficient of them by Dy doped significantly increased, and the maximum value of about 12.2 × 10K was reached at x = 0.3. The thermal conductivity of Ba2(DyxYb1–x)AlO5 decreased firstly and then increased with the increasing of x. For samples with the same compound point x = 0.2, the minimum value (0.998 W·m·K) was realized. The excellent thermal physical properties mean that these solid solutions are potential materials for ceramic layers in thermal barrier coatings.

Effects of Dy3+-doping on the thermophysical properties of Ba2YbAlO5 ceramics