论文部分内容阅读
以正钛酸(H4TiO4)、硝酸钡[Ba(NO3)2]为原料,以双氧水、氨水为溶剂,采用化学沉淀法制备出晶粒尺寸约20 nm的钛酸钡粉体.研究了原料种类、煅烧温度、加料方式、反应温度对钛酸钡粉体性能的影响,确定了最佳的制备条件.结果表明:当正钛酸(g)∶双氧水(mL)∶氨水(mL)=1∶5∶3,且采用正钛酸的双氧水-氨水溶液缓慢滴加到硝酸钡溶液中的加料方式时,溶解完全,制得的BaTiO3粉体粒径小、纯度高.用X射线衍射(XRD)和扫描电子显微镜(SEM)表征了颗粒的晶体结构、晶型转变机理以及颗粒的形貌;结果显示:前驱体的起始晶型转变温度为500,800℃煅烧获得的粒子晶型完整,形貌呈规则的球形,当煅烧温度升高到900℃时,粉体晶体结构由立方相转变为四方相.
BaTiO4 and barium nitrate [Ba (NO3) 2] were used as raw materials to prepare barium titanate (BaTiO3) powders with a size of about 20 nm by chemical precipitation using hydrogen peroxide as the solvent, , Calcination temperature, feeding method and reaction temperature on the properties of barium titanate powders were studied.The optimum preparation conditions were determined.The results showed that when the concentration of ortho titanic acid (g): hydrogen peroxide (mL): ammonia water (mL) = 1: 5: 3, and BaTiO3 powder with small particle size and high purity was prepared when the titanic acid hydrogen peroxide-ammonia solution was slowly dropped into the feed solution of barium nitrate solution by X-ray diffraction (XRD) And SEM were used to characterize the crystal structure, crystal transition mechanism and particle morphology of the particles. The results showed that the crystal structure of the particles obtained after calcination at 500,800 ℃ was intact, The regular spherical shape, when the calcination temperature rises to 900 ℃, the crystal structure of the powder changes from cubic phase to tetragonal phase.