【摘 要】
：
High-entropy oxides(HEOs)are considered promising thermal barrier coating(TBC)materials due to their unique thermophysical performances induced by the entropy effects.In this work,(La0.2Ce0.2Pr0.2Sm0.2Eu0.2)2Hf2O7 high entropy hafnate,as a thermal barrier
【机 构】
：
State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,710072
论文部分内容阅读
High-entropy oxides(HEOs)are considered promising thermal barrier coating(TBC)materials due to their unique thermophysical performances induced by the entropy effects.In this work,(La0.2Ce0.2Pr0.2Sm0.2Eu0.2)2Hf2O7 high entropy hafnate,as a thermal barrier coating(TBC)mate-rial,was successfully synthesized by solution combustion method for the first time.From the X-ray diffraction,scanning electron microscopy,and transmission electron microscopy results,it is confirmed that(La0.2Ce0.2Pr0.2Sm0.2 Eu0.2)2Hf2O7 has pure single-phase ordered pyrochlore structure with highly homogeneous composition at both micrometer and nanometer scales.The synthesized(La0.2Ce0.2Pr0.2Sm0.2Eu0.2)2Hf2O7 possesses excellent phase stability at 1600℃and demonstrates a low thermal conductivity(1.0-1.24 W·m-1·K-1)which is lower than those of rare earth hafnates(RE2Hf2O7,RE=La,Ce,Pr,Sm,Eu).Therefore,it provides a new perspective and potential to prompt the next gener-ation TBC materials with better performance.
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