(TiZrHf)P2O7: An equimolar multicomponent or high entropy ceramic with good thermal stability and low thermal conductivity
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第10期
论文作者：Zifan Zhao Huimin Xiang Fu-Zhi Dai Zhijian Peng Yanchun Zhou
文章页码：2227 - 2231
摘 要：Zr P2O7 is a promising material for high temperature insulating applications. However, decomposition above 1400℃ is the bottleneck that limiting its application at high temperatures. To improve the thermal stability, a novel multicomponent equimolar solid solution（Ti Zr Hf）P2O7 was designed and successfully synthesized in this work inspired by high-entropy ceramic（HEC） concept. The as-synthesized（Ti Zr Hf）P2O7 exhibits good thermal stability, which is not decomposed after heating at 1550℃ for 3 h. It also shows lower thermal conductivity（0.78 W m-1 K-1） compared to the constituting metal pyrophosphates Ti P2O7, Zr P2O7 and Hf P2O7. The combination of high thermal stability and low thermal conductivity renders（Ti Zr Hf）P2O7 promising for high temperature thermal insulating applications.
Zifan Zhao1,2，Huimin Xiang1，Fu-Zhi Dai1，Zhijian Peng2，Yanchun Zhou1
1. Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology2. School of Engineering and Technology, China University of Geosciences
摘 要：Zr P2O7 is a promising material for high temperature insulating applications. However, decomposition above 1400℃ is the bottleneck that limiting its application at high temperatures. To improve the thermal stability, a novel multicomponent equimolar solid solution（Ti Zr Hf）P2O7 was designed and successfully synthesized in this work inspired by high-entropy ceramic（HEC） concept. The as-synthesized（Ti Zr Hf）P2O7 exhibits good thermal stability, which is not decomposed after heating at 1550℃ for 3 h. It also shows lower thermal conductivity（0.78 W m-1 K-1） compared to the constituting metal pyrophosphates Ti P2O7, Zr P2O7 and Hf P2O7. The combination of high thermal stability and low thermal conductivity renders（Ti Zr Hf）P2O7 promising for high temperature thermal insulating applications.
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