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中文摘要：
以Sm2O3、Nd2O3、La2O3和CeO2为原料，采用固相反应法成功制备了具有单一萤石结构的(Sm0.5Nd0.5-xLax)2Ce2O7系列陶瓷材料。所制备材料组织结构致密，晶界清晰。由于基质原子与取代原子之间离子半径差随La掺杂量增加而逐渐增大，其热导率随La掺杂量增加而降低，但均低于Sm2Ce2O7。同时由于Nd和La相对较大的离子半径，该系列陶瓷热膨胀系数随La掺杂量增加而增大，但其热膨胀系数均大于YSZ陶瓷。
英文摘要：
Pure(Sm0.5Nd0.5-xLax)2Ce2O7ceramics with single fluorite-type structure were prepared successfully by solid reaction method usingSm2O3,Nd2O3,La2O3and CeO2as reactants.The synthesized products has densified microstructure and the grain boundaries are very clean.Because of the increasing ionic-radius difference between the substituting and substituted atoms,the thermal conductivity increase graduallywith the increasing content of La-doping content,and their thermal conductivity is lower than that of Sm2Ce2O7.The thermal expansioncoefficient increases gradually due to the relatively high ionic-radius of Nd and La,and their thermal expansion coefficient is greater than thatof YSZ.
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