摘要
用四氯化钛和氯化锶为原料、尿素和氢氧化钠为沉淀剂，采用分步沉淀法在低温下合成了高纯、超细、单分散性好的晶态钛酸锶粒子．讨论了沉淀剂种类对粒子形成过程及粉末性能的影响．结果表明，沉淀初期尿素作沉淀剂，有利于粒子球形化和单分散性；氢氧化钠为沉淀剂与Sr－TiO3粒子晶化和提高收率关系密切．该粉末平均粒径小于30um，Sr／Ti比可控、烧结活性高．
The highly pure、superfine and monosize-distribution strontium titanate crys- talline particles have been synthesized by fractional precipitation, when titanium tetrachlo-ride and strontium chloride were used as raw materials and urea and sodium hydroxide asprecipitation agents. The influences of the precipitation agents on formation of the particlesand properties of the powders have been discussed. The results show that urea as the firstprecipitation agent improves the sphericity of the particles and monosize-distribution. Sodi-um hydroxide as precipitation agent is favarable to the crystallization and yield of strontiumtitanate- Particle sizes down to 30 nm on average were obtained. The powders show a goodsinterability.
出处
《应用化学》
CAS
CSCD
北大核心
1998年第1期37-40,共4页
Chinese Journal of Applied Chemistry
关键词
钛酸锶
超细粉体
单分散粒子
分步沉淀
strontium titanate,superfine powder, monodispersed particle,fractional precipitation
