In this work,the(Sm1-xErx)2(Zr0.7Ti03)2O7(x=0,0.2,0.4)ceramics were prepared by a solid reac-tion method,and their phase structures and thermophysical properties were studied.The results indicate that(Sm1-xErx)2(Zr07Ti0.3)2O7 ceramics are composed of the single pyrochlore structure,the lattice constant decreases with the increase of Er3+doping amount.The introduction of Er2O3 can significantly reduce the thermal conductiv-ity of Sm2(Zr0.7Ti0.3)2O7 ceramic,and Er2O3 can shield thermal radiation and slow down the trend of abnormal in-crease of thermal conductivity at high temperature.The partial substitution of Er3+for Sm3+results in a decreased thermal expansion coefficient,which is reduced from 11.52 to 10.89 K-1.However,the thermal expansion coeffi-cients of(Sm1-xErx)2(Zr0.7Ti0.3)2O7 ceramics are still close to that of YSZ ceramics,meeting the application re-quirements of thermal barrier coatings.
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