High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials

High-entropy pyrochlore-type structures based on rare-earth zirconates are successfully produced by conventional solid-state reaction method. Six rare-earth oxides (La2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, and Y2O3) and ZrO2 are used as the raw powders. Five out of the six rare-earth oxides with equimolar ratio and ZrO2 are mixed and sintered at different temperatures for investigating the reaction process. The results demonstrate that the high-entropy pyrochlores (5RE(1/5))(2)Zr2O7 have been formed after heated at 1000 degrees C The (5RE(1/5))(2)Zr2O7 are highly sintering resistant and possess excellent thermal stability. The thermal conductivities of the (5RE(1/5))(2)Zr2O7 high-entropy ceramics are below 1 W.m(-1).K-1 in the temperature range of 300-1200 degrees C The (5RE(1/5))(2)Zr2O7 can be potential thermal barrier coating materials.