摘要
以Ba(OH)_(2)·8H_(2)O和Ti(OC_(4)H_(9))_(4)为原料、异丙醇(IPA)为溶剂,通过溶剂热法合成富四方相纳米钛酸钡(BTO)粉体,研究了钡钛比、体系pH值、溶剂热温度及时间等因素对制备高四方性纳米BTO粉体的影响,利用X射线衍射和扫描电镜等表征方法研究了IPA在溶剂热制备BTO过程中的作用机理。结果表明,溶剂热工艺合成过程中,IPA会优先提供一定的—OH以促进Ti(OC_(4)H_(9))_(4)的水解,生成TiO_(6)八面体并与Ba^(2+)连接。在低碱度环境中,经相转变、小颗粒溶解与重结晶等过程逐步转变为形貌规整的四方相BTO。钡钛比1.6、体系pH值10、溶剂热温度220℃、时间24 h、煅烧温度950℃、煅烧时间2 h时制备的富四方相纳米BTO粉体分散均匀、形貌规整,呈四方形或近四方形,c/a值达1.009 4,平均粒径为124 nm。
With Ba(OH)_(2)·8H_(2)O and Ti(OC_(4)H_(9))_(4) as raw materials,and isopropanol(IPA)as solvent,tetragonal⁃rich BaTiO3(BTO)nanopowder was synthesized by adopting solvothermal process.Effects of Ba/Ti ratio,pH value,solvothermal temperature and time on synthesis of tetragonal⁃rich BTO powders were investigated,and the mechanism of IPA in the solvothermal process for synthesis of BTO powders was also characterized by X⁃ray diffraction and scanning electron microscopy.It is found that in the solvothermal process,IPA will preferentially provide certain—OH to promote the hydrolysis of Ti(OC_(4)H_(9))_(4),generating TiO6 octahedra to interconnect with Ba2+,which is gradually transformed into the tetragonal phase BaTiO3 with regular morphology after phase transition,dissolution of small particles,and recrystallization in a low alkalinity environment.Experimental results show that under the following conditions including Ba/Ti ratio of 1.6,pH of 10 for the system,a solvothermal process at 220℃for 24 h,calcination at 950℃for 2 h,the synthesized tetragonal⁃rich BTO nanopowder is well dispersed with regular morphology,square or nearly square shape,with c/a value of 1.0094 and particle size of 124 nm on average.
作者
盖卉妍
戴超华
杨林
GAI Huiyan;DAI Chaohua;YANG Lin(Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha 410012,Hunan,China;Testing Technology Company of Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha 410012,Hunan,China)
出处
《矿冶工程》
CAS
北大核心
2024年第2期178-182,187,共6页
Mining and Metallurgical Engineering
关键词
钛酸钡
四方相
异丙醇(IPA)
溶剂热法
陶瓷电容器
钙钛矿材料
合成制备
barium titanate
tetragonal phase
isopropanol(IPA)
solvothermal process
ceramic capacitors
perovskite materials
synthesis
作者简介
盖卉妍(1997—),女,山东烟台人,硕士研究生,主要研究方向为有色金属冶金。E⁃mail:gaihy0616@qq.com。
