中文摘要：

采用固相反应法制备了Sm2YbTaO7和La2AlTaO7氧化物，并研究了其热物理性能。Sm2YbTaO7和La2AlTaO7氧化物在20.C~1200.C范围内的平均热导率分别是0.45W/(m.K)和1.71W/(m.K)，明显低于现役的氧化钇部分稳定氧化锆陶瓷(YSZ)。与La2AlTaO7相比，Sm2YbTaO7较低的热导率可以归因于其取代原子与基质原子之间较高的原子质量差别，Sm2YbTaO7较高的热膨胀系数则可归因于其A位与B位离子之间较低的电负性差别。Sm2YbTaO7和La2AlTaO7的热导率和热膨胀系数均满足热障涂层的要求，具有做为新型热障涂层表面陶瓷层材料使用的潜力。

英文摘要：

The Sm2YbTaO7and La2AlTaO7oxides were prepared by solid state reaction method and their thermophyscial properties were investigated.The average thermal conductivities of Sm2YbTaO7and La2AlTaO7are0.45W/(m?K)and1.71W/(m?K)in the temperature range of20?C~1200?C,which are lower than that of8YSZ.As compared to La2AlTaO7,the relative low thermal conductivity of Sm2YbTaO7can be attributed to the relative high atomic difference between the substituted and substituting atoms.Because of the relative low electro-negativity difference of Sm2YbTaO7,the thermal expansion coefficient of Sm2YbTaO7is higher than that of La2AlTaO7.Their excellent thermophysical properties means that Sm2YbTaO7and La2AlTaO7oxides can be explored novel candidates for thermal barrier coatings.