{Reference Type}: Journal Article {Title}: High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials {Author}: LI, Fei; ZHOU, Lin; LIU, Ji-Xuan; LIANG, Yongcheng; Guo-Jun, ZHANG {Journal}: Journal of Advanced Ceramics {ISBN/ISSN}: 2226-4108 {Year}: 2019 {Volume}: 8 {Issue}: 4 {Pages}: 576-582 {DOI}: 10.1007/s40145-019-0342-4 {Keywords}: thermal conductivity {Keywords}: high-entropy ceramics {Keywords}: pyrochlore {Keywords}: thermal barrier coating (TBC) {Abstract}: 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 (5RE1/5)2Zr2O7 have been formed after heated at 1000 ℃. The (5RE1/5)2Zr2O7 are highly sintering resistant and possess excellent thermal stability. The thermal conductivities of the (5RE1/5)2Zr2O7 high-entropy ceramics are below 1 W·m-1·K-1 in the temperature range of 300-1200 ℃. The (5RE1/5)2Zr2O7 can be potential thermal barrier coating materials. {URL}: https://www.sciopen.com/article/10.1007/s40145-019-0342-4 {Language}: en