SrBi_4Ti_4O_(15)陶瓷的制备及其电学行为

Preparation of SrBi_4Ti_4O_(15) ceramic and its electrical behavior

采用高强度机械混合的特殊液相沉淀法,以Sr(NO3)3、(C4H9O)4Ti和Bi(NO3)3·5H2O、为原料,制备了SrBi4Ti4O15纳米粉体。研究了前驱体的煅烧温度,粉体结构、粒度,陶瓷的烧结温度及其电性能。结果表明:制得的纳米级SrBi4Ti4O15粉体分散性好、粒径分布范围窄,显著降低了其烧结温度,较之普通固相法至少降低100℃,且粉体烧结活性较高,瓷体致密化温度在970～1000℃,成瓷效果良好。在100Hz以下,εr和tanδ随频率增加显著变小。

SrBi4Ti4O15 nanometer powder was prepared by high strength mechanical mixed special liquid-phase precipitation method with Sr（NO3）3, （C4H9O）4Ti and Bi（NO3）3·5H2O as raw materials. The calcine temperature of SrBi4Ti4O15 precursor, structure and particle size of powder, the sinter temperature of ceramics and its electric property were investigated. The results show that the sintering temperature of SrBi4Ti4O15 precursor is lower and the high sinterablity of the powders leads to lower densification temperature to 100℃ at least. The sintering effect is fairly good. The product consists of highly dispersed nanoparticles with homogenous distribution at 970-1 000℃. Below 100 Hz,εr and tanδ decrease obviously with increase of frequency.