板状LiNbO_3-Li_3NbO_4复合粒子的水热合成研究  

Study on hydrothermal synthesis of platelike LiNbO_3-Li_3NbO_4 composite particles

作　　者：杨长安[1] 朱建锋[1] 王芬[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2015年第4期56-59,共4页Journal of Shaanxi University of Science & Technology

基　　金：中国博士后科学基金项目(2013M542314);陕西省科技厅自然科学基金项目(2013JQ6012);陕西省科技厅重点科技创新团队计划项目(2013KCT-06);陕西科技大学博士科研启动基金项目(BJ12-22)

摘　　要：以板状K4Nb6O17为前驱体,LiOH为Li源,采用水热与热处理两步过程法合成了LiNbO3-Li3NbO4复合粒子.通过X射线衍射、场发射扫描电子显微镜、热重-差热对样品进行了表征,研究了水热反应中碱浓度与热处理温度等对LiNbO3-Li3NbO4复合粒子晶体结构和形貌的影响.实验结果表明,随着反应体系中LiOH浓度的升高,Li3NbO4样品的结晶性提高,随着热处理温度的升高,Li3NbO4与LiNbO3复合相的结晶性增强.The composite particle of LiNbO3-Li3NbO4 is synthesized via a two-step of hydrothermal and heat treatment process,using plate-like K4Nb6O17 as precursor,LiOH as Li source.The physical properties of the as-prepared samples were characterized by X-ray diffraction（XRD）,field emission scanning electron microscope（FE-SEM）and thermogravimetry（TG）and differential thermal analysis（DTA）and the effects of the alkali concentration of hydrothermal reaction and the temperature of heat treatment on the crystal structure and morphology of the composite particle of LiNbO3-Li3NbO4 were discussed.Results show that with the rise of the alkali concentration in hydrothermal reaction,the crystallinity of the Li3NbO4 increases and the higher heat treatment temperature leads to better crystallinity of the LiNbO3-Li3NbO4 composite.

关 键 词：LINBO3 Li3NbO4 复合相 水热 

分 类 号：TQ174[化学工程—陶瓷工业]