Ca、Ce双掺杂烧绿石型复合氧化物的合成及离子导电性能研究  

Synthesis and Electrical Properties of Ca and Ce Doped Pyrochlore-type Oxides

作　　者：谢亚红[1] 刘瑞泉[1] 李志杰[1] 王吉德[1] 宿新泰[1] 

机构地区：[1]新疆大学化学化工学院,乌鲁木齐830046

出　　处：《无机化学学报》2004年第5期551-554,共4页Chinese Journal of Inorganic Chemistry

摘　　要：O引言烧绿石结构(A2B2O7)非常近似于萤石结构,在一定程度上可以认为是缺阴离子的萤石结构,但是在未掺杂的烧绿石结构中,氧离子空隙是有序的,不会由此造成电子导电,一些氧离子可以离开自己的晶格位置占据空穴位置,产生离子导电[1].此外,烧绿石结构还是一种开放式结构,可以通过其他离子的掺杂,为氧原子、质子或电子的迁移提供空穴,或增大空穴浓度,从而提高离子导电能力[2].Pyrochlore-type rare earth complex oxides of La2-alphaCaalphaZr2-betaCebetaO7-delta were synthesized by the sol-gel method. The structure, of the samples was characterized by X-ray diffraction (XRD). The ionic conduction in solid electrolyte of the sintered samples was examined using electrochemical methods at 400similar to800 degreesC. The result indicated that the samples were pyrochlore-type structure, conductivities of the Ca and Ce doped samples were largely increased. Ammonia was synthesized from nitrogen and hydrogen at atmospheric pressure in the solid state proton conducting cell reactor. The ammonia evolution rate of doped samples is larger than that of the undoped ones, which indicates that the samples are proton conductor and the ability of protonic conductivity is mainly decided by hole concentration.

关 键 词：钙 铈 双掺杂 烧绿石结构 复合氧化物 合成 离子导电性能 质子导体 氨 柠檬酸 溶胶-凝胶法 

分 类 号：TQ126.29[化学工程—无机化工]