Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
Regular Issue: Full papers
Theoretical analysis of thermal and mechanical properties of Eu2Hf2O7 and Gd2Hf2O7 pyrochlores
Mingcheng SUNYuqiu SUIKai GAOChe TANLi DAIGuiping ZHOUYanjun ZHANGLi WANG
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2019 Volume 127 Issue 10 Pages 722-727


First-principles calculations were used to analyze relationship between elastic stiffness and thermal conductivity of Eu2Hf2O7 and Gd2Hf2O7 pyrochlore oxides. Eu2Hf2O7 demonstrated mechanical properties inferior to Gd2Hf2O7. Eu2Hf2O7 and Gd2Hf2O7 belong to quasi-ductile ceramic materials because their G/B ratios are below 0.571 and because of their positive Cauchy pressure values. Thermal conductivity values of Eu2Hf2O7 and Gd2Hf2O7, equal to 1.66 and 1.62 W/(m·K) are below that of yttria stabilized zirconia. Thus, Eu2Hf2O7 and Gd2Hf2O7 pyrochlores are promising as thermal barrier coatings for high-temperature applications, for example, in gas turbine engines.

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