超声化学法合成SrTiO3纳米颗粒形貌的演变  

SYNTHESIS OF SrTiO_3 NANOPARTICLES BY SONOCHEMICAL METHOD AND THEIR SHAPE EVOLUTION PROCESS

作　　者：刘红[1] 吕忆农[1] 徐明[1] 刘云飞[1] 施书哲[1] 

机构地区：[1]南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,江苏南京210009

出　　处：《硅酸盐学报》2008年第7期960-964,共5页Journal of The Chinese Ceramic Society

基　　金：江苏省省级环保科技基金(2007022)资助项目

摘　　要：以TiCl4和SrCl2·6H2O为原料,采用超声化学法在较低温度下合成了结晶度良好的星形、方形和球形SrTiO3纳米粉体。实验研究了初始反应物离子浓度、超声时间、pH值对合成产物形貌的影响。用X射线衍射仪、扫描电镜和和能谱仪测定粉体的组分和形貌。结果表明:改变超声时间、pH值和初始反应物离子浓度可以控制SrTiO3纳米颗粒形貌的演变。控制反应时间为40～80min,pH值为12和13时,初始反应物离子浓度低时得到四角对称的星形SrTiO3纳米颗粒,离子浓度增加得到方形和球形颗粒;pH值为14时得到方形和球形的SrTiO3纳米颗粒。Well-crystallized SrTiO3 nanopowders including star-shaped, cubic and spherical were successfully synthesized by ultrasound irradiation under low temperature. The reactant concentrations, sonication time and pH value of the solution were investigated. Characterization techniques such as X-ray powder diffraction analysis, scanning electron microscopy and energy dispersive X-ray analysis were used to investigate the products. The results show that the SrTiO3 shape evolution can be controlled by reactant concentration, sonication time and pH value. Star-shaped SrTiO3 nanoparticles with four symmetric arms can be obtained by controlling at pH 12 and 13 when the reactant concentration is low. With the increase of the reactant concentration cubic and spherical nanoparticles are obtained. When the pH is 14, cubic and spherical SrTiO3 nanoparticles can be synthesized.

关 键 词：钛酸锶 超声化学 形貌演变 

分 类 号：TF123[冶金工程—粉末冶金]