(TiZrHf)P2O7: An equimolar multicomponent or high entropy ceramic with good thermal stability and low thermal conductivity |
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| Affiliation: | 1. Department of NanoEngineering, University of California, San Diego La Jolla, CA 92093, USA;2. Department of Mechanical and Aerospace Engineering, University of California, San Diego La Jolla, CA 92093, USA;3. Program of Materials Science and Engineering, University of California, San Diego La Jolla, CA 92093, USA |
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| Abstract: | ZrP2O7 is a promising material for high temperature insulating applications. However, decomposition above 1400 °C is the bottleneck that limiting its application at high temperatures. To improve the thermal stability, a novel multicomponent equimolar solid solution (TiZrHf)P2O7 was designed and successfully synthesized in this work inspired by high-entropy ceramic (HEC) concept. The as-synthesized (TiZrHf)P2O7 exhibits good thermal stability, which is not decomposed after heating at 1550 °C for 3 h. It also shows lower thermal conductivity (0.78 W m−1 K−1) compared to the constituting metal pyrophosphates TiP2O7, ZrP2O7 and HfP2O7. The combination of high thermal stability and low thermal conductivity renders (TiZrHf)P2O7 promising for high temperature thermal insulating applications. |
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| Keywords: | Metal phosphates High-entropy ceramics Thermal stability Thermal conductivity |
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