(TiZrHf)P2O7: An equimolar multicomponent or high entropy ceramic with good thermal stability and low thermal conductivity. Issue 10 (October 2019) - Zhao, Zifan
Abstract: ZrP2 O7 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)P2 O7 was designed and successfully synthesized in this work inspired by high-entropy ceramic (HEC) concept. The as-synthesized (TiZrHf)P2 O7 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 TiP2 O7, ZrP2 O7 and HfP2 O7 . The combination of high thermal stability and low thermal conductivity renders (TiZrHf)P2 O7 promising for high temperature thermal insulating applications.