拓扑化学法合成片状BaTiO_3晶体  

Synthesis of BaTiO_3 Platelets by Topochemical Method

作　　者：杜松昭[1,2] 赵巍[2] 耿浩然[1] 

机构地区：[1]济南大学材料科学与工程学院,济南250022 [2]天津城市建设学院材料科学与工程系,天津300384

出　　处：《硅酸盐学报》2012年第7期988-993,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50871047);山东省自然科学基金(ZR2010-EM071)资助

摘　　要：采用拓扑化学法,以KCl–NaCl、KCl–BaCl2等为熔盐体系,在900～1100℃制得BaTiO3片状晶体,分析了反应各参数对晶体微观形貌及性能的影响。热重、扫描电子显微镜、X射线衍射分析表明:在熔盐体系为KCl–BaCl2,反应物BaBi4Ti4O15与BaCO3的摩尔比为1:3.1,温度为950℃条件下,得到的BaTiO3晶体分布均匀、各向异性好、具有规则的片状外形,可以作为制备钙钛矿系织构化陶瓷的良好模板晶体。The plate-like crystals of BaTiO3 were synthesized in KCl-NaCl, KCl-BaCl2 molten salt systems at 900-1 100 ℃ by a topochemical method. The parameter effects （such as molten salt, synthesis temperature and materials ratio） on the synthesis performance were investigated. The products synthesized were characterized by X-ray diffraction, scanning electron microscopy and differential thermal analysis, respectively. The results indicate that the BaTiO3 platelets with a high aspect ratio are obtained at 950 ℃ when the molten salt is KCl-BaCl2 at the BaBiaTiaO15/BaCO3 ratio of 1.0：3.1. The platelets can be used as templates for the perovskite-structured textured ceramics.

关 键 词：钛酸钡 拓扑化学法 片状晶体 微观形貌 

分 类 号：TM282[一般工业技术—材料科学与工程]