论文部分内容阅读
以Ti Cl4、Bi(NO3)3和K2CO3为原料采用柠檬酸盐溶胶-凝胶法低温烧结制备了纳米钛酸铋钾(KBT)粉体。利用DSCTG、XRD、SEM、TEM分别对KBT粉体的形成过程、物相结构及晶粒尺寸进行表征。研究并讨论了Ti Cl4浓度、煅烧温度、柠檬酸盐量等对KBT粉体结构的影响。结果表明,TiCl4浓度为1.5 mol/L时,700℃煅烧2 h合成了单相的片状K0.5Bi0.5TiO3纳米粉体,粉体颗粒边长大约在100~300 nm,厚度为20~50 nm;与固相法相比,烧结温度降低了300℃;与未添加柠檬酸盐的KBT相比,柠檬酸盐改性后的KBT粒子具有良好的分散性,且能有效抑制晶粒长大。
The bismuth potassium titanate (KBT) powder was prepared by the low temperature sintering of TiCl4, Bi (NO3) 3 and K2CO3 by citrate sol-gel method. The formation process, phase structure and grain size of KBT powder were characterized by DSCTG, XRD, SEM and TEM respectively. The effects of TiCl4 concentration, calcination temperature and citrate concentration on the structure of KBT powder were studied and discussed. The results show that single phase K0.5Bi0.5TiO3 nanopowder is synthesized when the TiCl4 concentration is 1.5 mol / L and calcined at 700 ℃ for 2 h. The side length of the powder is about 100-300 nm and the thickness is about 20-50 nm. Compared with the solid phase method, the sintering temperature decreased by 300 ℃. Compared with the KBT without citrate, KBT particles modified by citrate showed good dispersibility and inhibited grain growth effectively.