溶剂热制备纳米钛酸钡粉体的结晶度和尺寸调控  

Tetragonality and size control of barium titanate nanopowders prepared by solvothermal method

作　　者：方亮[1] 王芸[1] 周洪庆[2] 彭程[1] 朱海奎[2] 

机构地区：[1]蚌埠玻璃工业设计研究院浮法玻璃新技术国家重点实验室,安徽蚌埠233000 [2]南京工业大学材料科学与工程学院,南京210000

出　　处：《功能材料》2015年第22期22118-22122,共5页Journal of Functional Materials

基　　金：浮法玻璃新技术国家重点实验室开放基金资助项目(KF201304);教育部长江学者与创新团队资助项目(IRT1146);江苏省优势学科资助项目(PAPD)

摘　　要：以溶剂热的方法制备纳米四方相钛酸钡粉体,通过改变反应时间、前驱物钡钛摩尔比n(Ba)/n(Ti)来调控粉体的粒径大小、粒度分布和四方相结晶度。BET比表面积、激光粒度分析、SEM、XRD、FTIR测试结果表明,延长反应时间可减少钛酸钡粉体—OH含量,四方相结晶度有所提高,粉体粒径随之变大,粒度分布变宽;随着n(Ba)/n(Ti)的提高,钛酸钡粉体—OH含量相应减少,粉体颗粒尺寸呈先增大后减小的趋势,但基于"尺寸效应",粉体四方相结晶度并未因—OH含量的减少而线性增大。当反应时间为1h,n(Ba)/n(Ti)为2.5时,合成钛酸钡粉体粒径小、粒度分布较窄且具有较高的四方相结晶度,适用于制备小于2μm瓷膜的MLCC。Tetragonal BaTiO3 nanopowders have been prepared by solvothermal method,the tetragonality,particle size and distribution of as-prepared BaTiO3 particles were optimized by adjusting soaking time and molar ratio of precursors n(Ba)/n(Ti),The characterization of specific surface area,laser particle size,SEM,XRD and FT-IR indicated that prolonging soaking time could reduce the content of—OH,leading to enhance the tetragonality of as-prepared BaTiO3 nanopowders,meanwhile the particle size and distribution became larger.With n(Ba)/n(Ti)increasing,the particle size first increased and then decreased,correspondingly the content of—OH became lower,but because of size effect the tetragonality did not present a tendency of linear increase due to less content of—OH.The BaTiO3 nanopowders synthesized in the condition of 1hsoaking time and n(Ba)/n(Ti)=2.5was suitable for preparing MLCC consisted of less than 2μm ceramic tape due to small particle size,narrow distribution and high tetragonality.

关 键 词：溶剂热 钛酸钡 粒度分布 尺寸效应 四方相结晶度 

分 类 号：TQ174[化学工程—陶瓷工业]