脉冲电流烧结掺杂Ba_(0.5)Sr_(0.5)TiO_3陶瓷介电性能的研究  

Dielectric Properties of Ba_(0.5)Sr_(0.5)TiO_3 Ceramics Sintered by Pulse Electric Current Sintering

作　　者：沈彩[1] 刘庆峰[1] 刘茜[1] 

机构地区：[1]中国科学院上海硅酸盐所高性能陶瓷和超微结构国家重点实验室,上海200050

出　　处：《无机材料学报》2004年第6期1339-1344,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(20151003/B01);上海市科委基础研究重点项目(02JC 14015)

摘　　要：以硝酸钡、硝酸锶、钛酸四丁脂、硝酸铜、硝酸镧以及氨水为原料,利用柠檬酸-硝酸盐燃烧法制备了Ba0.5Sr0.5TiO3(BST)、1mol％Cu2+掺杂BST、1mol％La3+掺杂BST,以及0.5mol％Cu2+和0.5mol％La3+共掺杂BST粉末.利用脉冲电流(简称PECS)烧结设备烧结所制备的粉体,结果发现掺杂可以大大改善BST陶瓷晶粒大小的均匀性.介电性能测试结果表明1mol％Cu2+掺杂不仅降低了BST的介电损耗,同时也降低了介电常数,而1mol％La3+掺杂,以及0.5mol％Cu2+和0.5mol％La3+共掺杂降低了BST的介电损耗,但在25℃附近介电常数升高.Cu2+, La3+ and (Cu2+, La3+) co-doped BST ceramics were fabricated from the powder prepared by using barium nitrate, strontium nitrate, copper nitrate, lanthanum nitrate,tetra-n-butyl titanate, and ammonium hydroxide via a citrate-nitrate combustion process. Pulse electric current sintering (PECS) was carried out to obtain the compact crystalline BST. The effects of Cu2+, La3+ doping and (Cu2+, La3+) co-doping on the dielectric property of BST were investigated. It showed that Cu2+, La3+ doping and (Cu2+, La3+) co-doping in BST bulk could dramatically modify the homogeneous of grain sizes in the sintered samples. The dielectric test showed that the Cu doping decreased not only loss tangent, but also the dielectric constant, while La doping and (La, Cu) co-doping decreased the loss tangent, but increased the dielectric constant at 25℃ to some degree.

关 键 词：钛酸锶钡 柠檬酸-硝酸盐燃烧法 掺杂 脉冲电流烧结 介电性质 

分 类 号：TN304[电子电信—物理电子学]