Abstract
A novel high-entropy oxide, Sm2Gd0.25Dy0.25Er0.25Yb0.25TaO7, was synthesized via Sol-Gel and high-temperature calcining method. The powder and bulk specimen for Sm2Gd0.25Dy0.25Er0.25Yb0.25TaO7 were characterized, and its thermophysical performances were measured. The researching conclusions indicate that the synthesized nano-powder is very pure, and the block specimen has a sole pyrochlore structure, densified microstructure, and uniform distribution of elements. The low thermal conductivity is ascribed to phonon scattering stemmed from the ionic size and atomic mass disorders derived from multi-component addition. The high lattice-energy leads to a relatively low thermal expansion coefficient, which satisfies the demand of thermal barrier coating. The Sm2Gd0.25Dy0.25Er0.25Yb0.25TaO7 oxide also maintains outstanding phase steadiness up to 1200 °C.
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