摘要
采用甘氨酸-硝酸盐法合成了钙钛矿结构LSCFM(y=0.20、0.35、0.50、0.65、0.80)材料。用直流四探针法测定了材料在100～800℃静态空气气氛中的电导率,结果表明,其导电行为符合小极化子导电机制,电导率随温度的升高而增大。电子跳跃能随Mn含量的增大而减小,而小极化子跳跃几率随Mn含量的增大而增大,使材料电导率随Mn含量的增大而增大。用碘滴定法测定了材料的氧非化学计量值,结果表明,氧非化学计量值随Mn含量的增大而增大,LSCFM(y=0.20)晶格内存在一定的间隙氧,而LSCFM(y=0.35、0.50、0.65、0.80)晶格内存在少量的氧离子空位。
The perovskite-type materials LSCFM（y=0. 20,0. 35,0. 50,0. 65,0. 80） are synthesized by the glycine-nitrate process method. Conductivities of them are measured by a four-probe DC method in the static air atmosphere at between 100℃ and 800℃, and it is found that their conductive behaviors correspond to the small polaron principle,and the conduetivities increase with the temperature increasing. The electron-hopping energy increasing and the probability decreasing are after the Mn content increasing, so the conductivities increase with it. The result of the iodine titration for the materials shows that the oxygen nonstochiometry values rise with Mn content increasing,and there is a certain amount of interstitial oxygen in LSCFM（y= 0. 20）, while there are a little amount of oxygen vacancy in LSCFM（y= 0. 35,0. 50,0. 65,0. 80） respectively.
基金
云南省应用基础研究项目(2009ZC027M)
关键词
钙钛矿
电导率
氧非化学计量
小极化子
perovskite, conductivity, oxygen nonstochiometry, small polaron
