锶盐对溶胶-凝胶法制备(Sr,Pb)TiO_3纳米晶粉的影响

Effect of the different strontium raw materials on the preparation of (Sr,Pb)TiO_3 in Sol-Gel process

目的 比较不同锶盐对制备(Sr,Pb)TiO3纳米晶粉的影响。方法 分别以硝酸锶和醋酸锶为原料,采用溶胶 凝胶法制备(Sr,Pb)TiO3纳米晶粉。结果 比较了不同实验条件下,锶源不同导致形成溶胶、凝胶和(Sr,Pb)TiO3纳米晶粉的差异,分析了形成差异的原因。结论两种原料各有利弊。采用醋酸锶为锶源可以获得纯钙钛矿相的(Sr0.4Pb0.6)TiO3纳米晶粉,其平均粒径约为18nm,外观多呈球形且分散性较好。

Aim Effect of different strontium raw materials on the Sol, Gel and the nanocrystalline powders of (Sr,Pb)TiO_3 were invesitigated.Methods The nanocrystalline powders of (Sr,Pb)TiO_3 were prepared in Sol-Gel process .Results The gel time is prolonged when more acetic acid was added.In addition,water volume is another important factor for the gel formation.Adding more water in the system leads to longer gel time.The phases of (Sr,Pb)TiO_3 powders were investigated by XRD,and the images were investigated by TEM. All the XRD results show that the nanocrystalline powders of (Sr,Pb)TiO_3 are perovskite phase.Conclusions Each of the strontium raw materials has its own strong point. Using strontium acetate as strontium raw material, the pure perovskite powders of (Sr_(0.4)Pb_(0.6))TiO_3 have been prepared. The average grain size of the powders is ～18 nm, most of which are spherical.