以Gd2 O3、MgO 和Ce(NO3)．6 H2 O 为原料，采用溶胶凝胶法制备了(Gd1－x Mgx )2 Ce2 O7－x/2固溶体.用X射线衍射法分析了固溶体的相组成，用扫描电镜观察了其致密块体样品的显微组织，用激光脉冲法测试了固溶体的热扩散系数.结果表明，成功制备了纯净的具有萤石结构的(Gd1－x Mgx )2 Ce2 O7－x/2固溶体，其致密块体结构致密，晶界清晰，较多的氧空位使(Gd0．95 Mg 0．05)2 Ce2 O6．95具有最低的热导率，(Gd1－x Mgx )2 Ce2 O 7－x/2固溶体有潜力用作热障涂层表面陶瓷层材料.
Using Gd2 O3 ,MgO and Ce(NO3 )?6 H2 O as reactants,(Gd1-x Mgx )2 Ce2 O7-x/2 solid solutions were prepared by Sol-gel method.Their phase structure was analyzed by X-diffraction,their microstructure was ob-served by scanning electronic microscope,and their thermal diffusivities were measured by laser-flashing meth-od.Results show that pure (Gd1-x Mgx )2 Ce2 O7-x/2 ceramics with fluorite structure are synthesized successfully, the dense bulk samples have dense microstructure and clean grain boundaries.The new produced oxygen vacan-cies results in the lowest thermal conductivity of (Gd0.95 Mg0.05 )2 Ce2 O6.95 solid solution.The (Gd1-x Mgx )2 Ce2 O7-x/2 solid solutions can be used as ceramic materials for thermal barrier coatings.
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