Cd掺杂钙铝石多孔电子化合物的制备及其电学性能  

Preparation and Electrical Properties of Cd-doped C12Al14O33 Porous Electride

作　　者：王睿[1] 杨辉[1] 江包家琪 郭兴忠[1] 

机构地区：[1]浙江大学材料科学与工程学院

出　　处：《硅酸盐学报》2018年第1期40-44,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51372225)

摘　　要：采用溶胶–凝胶伴随相分离法并结合真空还原工艺制备了Cd掺杂钙铝石（Ca（12–x）CdxAl7O33）电子化合物多孔材料,研究了Cd掺杂对钙铝石电子化合物的显微结构、晶体变化及其电学性能的影响。结果表明：Cd掺杂钙铝石含有全贯通网络状的大孔微观结构,大孔骨架致密稳定,孔隙率最高达66%;1 100℃热处理后,Cd元素取代较为活泼的钙离子,使得体系更为稳定,且不会破坏钙铝石本身较为稳定的笼状结构;经真空900℃还原,Cd掺杂钙铝石由绝缘体变为电子化合物,具有一定导电能力,其电子浓度最高可达6.904×10^13 cm^–3。Cd-doped mayeniteCa12–xCdxAl7O33 porous electrides were prepared by a phase separation-assisted sol-gel technology accompanied by vacuum reduction process.The effects of Cd doping amount on the microstructure,crystalline phase and electrical properties of mayenite electrides were investigated in detail.The results show that the as-prepared Cd-doped mayenite possesses a co-continuous macrostructure with the dense skeletons and the porosity as high as 66%.After heat treatment at 1100 ℃,the Cd element doping does not destroy the ＂cage＂ structure of mayenite,while replaces a certain amount of more active calcium ions in the mayenite,making the structure more stable.The Cd-doped mayenite could transform from the insulator into a certain conductivity of the electride material after reduced at 900 ℃ under vacuum environment,whose electron concentration is up to 6.904×10^13 cm^–3.

关 键 词：钙铝石 电子化合物 掺杂 大孔 

分 类 号：TQ332[化学工程—橡胶工业]