Abstract
Rare earth tantalum oxides (RE23+M3+M5+O7) are deemed as one of potential materials for thermal barrier coating due to their excellent thermophysical performances. In the present paper, two high-entropy oxides, (Gd0.2Dy0.2Y0.2Yb0.2Lu0.2)2GdTaO7 (GLGT) and (La0.2Dy0.2Nd0.2Yb0.2Lu0.2)2 GdTaO7 (LYGT), were prepared and their thermophysical properties were investigated. The final conclusions present that the achieved oxides show a sole fluorite lattice and excellent lattice stability. Owing to their low lattice energies and the addition of multicomponent elements, these two obtained ceramics show higher thermal expansion coefficients than La2Zr2O7. The thermal expansion coefficient of LYGT is higher than that of YSZ, whereas that of GLGT is similar to that of YSZ. The thermal conductivity of LYGT is within 1.54–1.41 W/m. K, and that of GLGT ranges from 1.89 W/m. K to 1.64 W/m. K. Their thermal conductivities are lower than that of Y2O3-stabilised ZrO2 (YSZ). These results suggest that these two high-entropy oxides have the potentials to be employed as thermal barrier coating materials in the future.
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