【摘要】 以钛酸四丁酯、硝酸铋、醋酸钠和冰醋酸为原料,利用溶胶-凝胶工艺得到透明凝胶,经干燥后煅烧成(Na0.5Bi0.5)TiO3微粉。通过对溶胶体系水/醇盐的摩尔比、初始pH值及胶凝温度对(Na0.5Bi0.5)TiO3凝胶体系溶胶-凝胶形成过程影响的研究,发现水/醇盐比R在35≤R≤60,pH在2.2~3.5,反应温度在40~60℃时,能够得到透明的溶胶;通过TG-DTA、SEM、X-ray等分析手段对(Na0.5Bi0.5)TiO3粉体进行测试,表明在650℃合成1h可以得到单一钙钛矿(Na0.5Bi0.5)TiO3晶体;采用TEM对(Na0.5Bi0.5)TiO3干凝胶粉体分析其粒径大小约为10nm。更多还原

【Abstract】 The clear and transparent gels of sodium-bismuth titanate can be prepared using tetrabutyl titanate, bismuth nitrate pentahydrate, sodium acetate, and acetic acid as starting materials by sol-gel technology,and the (Bi_0.5Na_0.5)TiO₃ ultrafine-powders were produced after the dry gels were calcined. Through the research over the influence of initial pH value of sol, a mole ratio of water and alkoxide, temperature of sols of the formation of sol-gel, it proves that the clear and transparent sols are attained, with the initial pH value of 2.2-3.5, a mole ratio of water to alkoxide of 35-60, and the temperature of 40-60℃. The characteritics of (Bi_0.5Na_0.5)TiO₃ powder were analyzed by means of thermo-gravimetric analysis （TG）, differential thermal analysis （DTA）, SEM, and X-ray diffraction （XRD）, it shows that pure single phase (Bi_0.5Na_0.5)TiO₃ powders could be obtained at 650℃ for 1h. The particle size of the dry-gel powders examined by TEM is about 10nm.更多还原