以乙二醇(EG)为溶剂,采用柠檬酸溶胶-凝胶法成功制备了晶粒细化的Ca3 Co4 O9+δ粉体,结合SPS烧结技术烧结成陶瓷决体,分析了晶粒尺寸对Ca3 Co4 O9+δ电学性能的影响.研究发现,以EG为溶剂能有效降低晶粒尺寸,XRD和SEM表征结果表明所制备的粉体及块体均为纯相Ca3 Co4 O9+δ;随着溶剂中EG比例的增加,粉体粒径由1000nm降低至100 nm,相应Ca3 Co4 O9+δ块体的层状晶粒厚度也由1000 nm降低至约120 nm.电性能测试结果表明,晶粒细化提高了试样的电性能,虽晶粒细化影响了电导率的提高,但Seebeck系数增加,最终试样功率因子增大,当晶粒尺寸为120 nm、880 K时其功率因子可达299.4×106W/(m·K2).
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