Thermal conductivity of (Hf1−xZrx)6Ta2O17 (x = 0, 0.1, 0.3 and 0.5) ceramics

(Hf1−xZrx)6Ta2O17 (x = 0, 0.1, 0.3 and 0.5) ceramic powders were synthesized by conventional solid-state method. The samples of these ceramics were prepared by pressureless sintering process at 1600 °C for 8 h in air. X-ray diffraction characterization indicated that all samples were single phase with orthorhombic structure. The thermal diffusivities of the samples from 200 °C to 1000 °C were characterized by laser flash diffusivity measurement. The thermal conductivities of (Hf1−xZrx)6Ta2O17 decreased with the increase of zirconium content x. Thermal conductivity of (Hf0.5Zr0.5)6Ta2O17 was about 2.75 W/m K which was comparable with that of dense partially yttria-stabilized zirconia (∼2.5 W/m K).