中文摘要：

铬酸镧是最有希望的固体氧化物燃料电池陶瓷连接材料，但存在空气中烧结活性差、中温电导率低等缺陷。利用微波辅助Sol—gel工艺成功制备了La0．7Ca0．3CrO3-δ高活性超细粉体，粉体粒径分布集中，900℃煅烧后的粉体在1400℃空气中烧结4h获得了高达96．3％的相对密度。烧结体具有优良的电导性能，850℃达到63．6s／cm，远高于文献报道值，完全能够满足中温燃料电池（IT—SOFCs）的使用要求。

英文摘要：

LaCrOa-based materials are the most hopeful ceramic interconnects for solid oxide fuel cells（SOFCs）. However, to date, this kind of material is poorly sinterahle in air and has relatively low electrical conductivity at intermediate temperatures. The fine precursor powders of La0.7Ca0.3CrO3-δ were prepared by a microwave-aided sol-gel process. Results indicate that the specimen sintered at 1400℃ for 4h in air has a high relative density of 96. 3%, as the precursor powder calcined at 900℃ for 2h. The electrical conductivity of the densely sintered sample reaches 63. 6 S/em at 850℃ in air, much higher than the reported values. La0.7Ca0.3CrO3-δ synthesized by this sol-gel process is very suitable for IT-SOFC interconnect.