摘要
研究了常压下以偏钛酸和氢氧化钡为原料，乙醇为溶剂制备纳米钛酸钡粉末的工艺条件。结果表明反应原料的钡钛比1.0：反应温度79℃；反应时间6h；pH值11为最佳制备条件．通过对在最佳条件下所得产物的XRD分析，表明钛酸钡粉体为立方相，a值约为4．028,TEM分析表明，分散的钛酸钡纳米粒子呈方形，平均粒径约20nm；ED分析表明，钛酸钡纳米粒子为多晶结构，其中有少量的单晶存在，通过对不同反应时间合成的产物的XRD分析，认为本法合成的钛酸钡为原位转变形成机理。
Alcohol-thermal synthesis of nano-BaTiO3 from H2TiO3 and Ba（OH）2 at an Atmospheric Press was systematicaUy studied and the optimized preparation conditions were obtained. When the reaction is carried out at a temperature of 79℃, an atmos-pheric press for 6h, the moral ratio of Ba（OH）2： H2TiO3=1.0, pH=11, the crystal structure of BaTiO3 from XRD is cubic with the constant（a） being 4.028; TEM photos showed that the BaTiO3 nanoparticles were square in shape, the average size was about 20nm;ED images indicated that the BaTiO3 nanoparticles were polycrystalline structure, and some of BaTiO3 were monocrystalline particles. By analyzing the relationship between the phase of obtained products and the reaction time, BaTi205 and the Ba/Ti moral ratio, it is proposed that the formation mechanism of BaTiO3 powders is in-situ transformation mechanism.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A06期2118-2121,共4页
Journal of Functional Materials
关键词
纳米粉
钛酸钡
醇热法
原位转变
nanoparticle
barium titanate
alcohol-thermal method
in-situ transformation
