热水溶液中钛酸锶晶粒的结晶过程  

CRYSTALLIZATION PROCESS OF STRONTIUM TITANATE FINE POWDER UNDER HYDROTHERMAL CONDITIONS

作　　者：张士成[1] 陈炳辰[1] 韩跃新[1] 邓江宁[2] 

机构地区：[1]东北大学资源与土木工程学院 [2]东北大学材料测试中心,沈阳110004

出　　处：《硅酸盐学报》2001年第5期447-450,共4页Journal of The Chinese Ceramic Society

摘　　要：研究了以TiCl4水解得到的H4TiO4胶体作为钛源 ,在热水溶液中制备SrTiO3 晶粒的结晶过程 .TEM和XRD结果表明 :其结晶过程主要包括 3个阶段 ,第 1阶段主要是SrTiO3 晶核的形成过程 ;第 2阶段主要是SrTiO3 晶粒的配向聚集生长过程 ;第 3阶段主要是SrTiO3 晶粒的溶解结晶过程 .其中第 1阶段的控制步骤为H4TiO4胶体的溶解 .第 2阶段中晶粒的配向聚集生长在短时间内即可完成 ,很快进入第 3阶段小晶粒的溶解和大晶粒的重结晶过程 ,该阶段反应速度慢 ,需要较长时间才能得到结晶完好的晶粒 .在热水溶液中以H4TiO4胶体作为钛源制备SrTiO3 晶粒关键在于控制结晶过程的第 1阶段和第Strontium titanate fine powders were prepared from H 4TiO 4 gels. The crystallization process of SrTiO 3 particles was studied by TEM and XRD. Three stages can be characterized: the first stage is dominated by nucleation, which is controlled by the dissolution of H 4TiO 4 gels; the second stage is dominated by a fast coordinate coagulation of SrTiO 3 nuclei; the third stage is dominated by a very slow dissolution-precipitation processes. The key stages to control the crystallization process of SrTiO 3 particles are the first and second stages.

关 键 词：钛酸锶 水热法 晶粒 结晶过程 电子陶瓷 热水溶液 

分 类 号：TQ174.756[化学工程—陶瓷工业] TQ174.1[化学工程—硅酸盐工业]