铌酸钾粉体水热法制备的工艺研究  

Research on the preparation process of potassium niobate powder by hydrothermal method

作　　者：王世平[1] 苗鸿雁[1] 谈国强[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西咸阳712081

出　　处：《无机盐工业》2007年第3期18-20,共3页Inorganic Chemicals Industry

基　　金：国家自然科学基金资助项目(项目编号:50372039)

摘　　要：以氢氧化钾和氧化铌为原料,同时氢氧化钾作为矿化剂,通过水热法合成了结晶度高、晶粒发育完整的铌酸钾微晶。借助XRD分析了钾铌物质的量比、反应温度和反应时间对晶相和粒度的影响;并通过SEM分析了铌酸钾的晶粒形貌。研究结果表明:钾铌物质的量比和反应温度是水热合成铌酸钾粉体的关键因素;当反应时间超过24 h时,铌酸钾晶相的衍射峰基本无变化。当钾铌物质的量比为4∶1、反应温度为220℃、反应时间超过24 h时,所得铌酸钾为正交晶相的微晶。By using potassium hydroxide and niobium pentaoxide as the raw materials and potassium hydroxide as the mineralizer at the same time, the microlite of potassium niobate with high degree of crystaUinity and perfect crystal grain has been prepared. With the benefit of XRD, the influences of the ratio of the amount of substance of potassium and niobium, reaction temperature and time on the crystal phase and granularity were analyzed. The topography of crystal grain of potassium niobate was also analyzed by SEM. The research results showed that the ratio of the amount of substance of potassium and niobium and reaction temperature are the key factors of the synthesis of potassium niobate powder;when the reaction time exceeds 24 h,the diffraction maximum of the crystal phase of potassium niobate basically has no change;when the ratio of the amount of substance of potassium and niobium is 4 ： 1, reaction temperature is 220℃ and the reaction time exceeds 24 h, the prepared potassium niobate is microlite with orthorhombic crystal phase.

关 键 词：铌酸钾 水热合成 正交晶相 

分 类 号：TQ131.13[化学工程—无机化工]