Abstract
Newly developed (Gd1-xYbx)2AlTaO7 oxides for high-temperature heat-insulation coatings were prepared using a multi-step solid-state fritting method. The important features of synthesized oxides including phase composition, thermal conductivity and expansion performances were studied. It is investigated that the fabricated ceramics are confirmed to possess a sole pyrochlore crystal structure. Owing to the influence of the strain fields and mass fluctuations caused by Yb2O3 addition, thermal conductivities of (Gd1-xYbx)2AlTaO7 oxides are lower than that of Gd2AlTaO7 or Yb2AlTaO7, and the (Gd0.9Yb0.1)2AlTaO7 exhibits the lowest thermal expansion coefficient. Due to the synergic effects of the relatively high electro-negativity of Yb3+, decedent lattice order, and numerous oxygen vacancies, the thermal expansion coefficients increase gradually with increasing Yb2O3 content. The thermophysical performances of (Gd1-xYbx)2AlTaO7 oxides satisfy the conditions for high-temperature heat-insulation coatings.
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