中文摘要：

胶体前驱物的预处理工艺将影响柠檬酸溶胶-凝胶法化学合成所得Ca3Co4 O9＋δ粉末的性能.以金属硝酸盐为起始原料,去离子水为溶剂,柠檬酸为络合剂,溶胶-凝胶化学法合成了Ca3Co4 O9＋δ溶胶.通过煅烧干凝胶前驱体制得了Ca3Go4 O9＋δ多晶体粉末,通过控制煅烧时间制备了不同粉末颗粒度的Ca3Co4O9＋δ粉末.利用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、选区电子衍射（SAED）、激光粒度分析仪等手段分析了所得粉末.结果表明：所得Ca3Co4O9＋δ粉末物相纯净、结晶良好,颗粒呈层片状结构,晶粒度约300nm,粉末粒径约300 nm～1.5 μm.粉末颗粒度均随煅烧时间延长而增大.

英文摘要：

Pretreating procedures of dry gel affect the properties of Ca3Co4O9＋δ powder synthesized by citrate acid sol-gel method. The Ca3Co4O9＋δ gel is prepared through sol-gel method with deionized water as solvent, citric acid as chelate, and metal nitrates as starting materials. Polycrystalline Ca3 Co4O9 ＋δ powder is prepared via calcining the dry gel, and the Ca3 Co4O9 ＋δ with different grain sizes is prepared by controlling the calcining time. The obtained Ca3Co4O9＋δ powders are analyzed by XRD, SEM, TEM, SAED and Marlvern granularity analysis. The results show that the Ca3Co4O9＋δ powder is single phased composition with good crystalline quality and flat-shaped powder microstructure, the crystal size is about 300 nm, the grain size ranges from 300 nm to 1.5 um, and the grain size increases with increasing the calcining time.