溶胶-凝胶法制备CaBi_4Ti_4O_(15)基陶瓷粉体  

CaBi_4Ti_4O_(15) Based Ceramic Powders Prepared by the Sol-Gel Process

作　　者：何新华[1] 叶常茂[1] 陈志武[1] 胡星[1] 

机构地区：[1]华南理工大学,广东广州510640

出　　处：《稀有金属材料与工程》2010年第S2期376-379,共4页Rare Metal Materials and Engineering

基　　金：广东省科技计划项目资助(2007A010500012)

摘　　要：采用溶胶凝-胶法制备V掺杂的铋层复合物CaBi4Ti3.95V0.05O15.025(CBTVO)陶瓷粉体,利用TDA/TG和IR光谱分析前驱体凝胶的变化,利用XRD和SEM分析和观察不同热处理温度下CBTVO粉体的相组成和颗粒形貌,利用EDX测定粉体颗粒的元素分布,并对CaBi4Ti4O15类钙钛矿主晶相的形成过程和机制进行探讨。结果表明:有机物在300℃之前基本上完全排除,铋层类钙钛矿结构的主晶相在500℃开始形成,并含有少量的Bi2O3相。Bi2Ti2O7相在590℃左右出现,当热处理温度高于800℃后则完全消失。热处理后的粉体颗粒呈片状,900℃热处理后粉体颗粒尺寸介于200～600nm之间,且各元素分布接近于化学计量比。Vanadium modified bismuth-layered compound CaBi4Ti3.95V0.05O15.025 (abbreviated as CBTVO) ceramic powders were fabricated by the sol-gel process. The thermal decomposition of the precursor was characterized by DTA/TG and IR spectra. Phase composition and morphology of CaBi4Ti3.95V0.05O15.025 powders heat-treated at different temperatures were analyzed by XRD and SEM. The element distributions on the powders were determined by EDX. The process and mechanism of forming the psudo-perovskite main crystalline phase were discussed. The result indicates that most organic substance is removed below 300 ℃, and the main crystalline phase of bismuth-layered structure forms at 500 ℃ with small amount of Bi2O3. Bi2Ti2O7 phase forms at around 590 ℃, and disappears when the temperature is above 800 ℃. The morphology of the heat-treated powders is plate-like, and the grain sizes of the heat-treated powders at 900 ℃are in the range of 200 to 600 nm. The element distribution of the powder is approximate to the stoichiometric composition.

关 键 词：铋层复合物 溶胶-凝胶 热处理 

分 类 号：TB383.3[一般工业技术—材料科学与工程]