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HfO 2  alloying effect has been applied to optimize thermal insulation performance of HoTaO 4  ceramics. X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy are employed to decide the crystal structure. Scanning electronic microscopy is utilized to detect the influence of HfO 2  alloying effect on microstructure. Current paper indicates that the same numbers of Ta 5+  and Ho 3+  ions of HoTaO 4  are substituted by Hf 4+  cations, and it is defined as alloying effect. No crystal structural transition is introduced by HfO 2  alloying effect, and circular pores are produced in HoTaO 4 . HfO 2  alloying effect is efficient in decreasing thermal conductivity of HoTaO 4  and it is contributed to the differences of ionic radius and atomic weight between Hf 4+  ions and host cations (Ta 5+  and Ho 3+ ). The least experimental thermal conductivity is 0.8 W·K −1 ·m −1  at 900 °C, which is detected in 6 and 9 mol%-HfO 2  HoTaO 4  ceramics. The results imply that HfO 2 –HoTaO 4  ceramics are promising thermal barrier coatings (TBCs) due to their extraordinary thermal insulation performance.

Influence of HfO2 alloying effect on microstructure and thermal conductivity of HoTaO4 ceramics