Effect of Calcination Temperature on Phase Transformation and Particle size of Barium Titanate Fine Powders Synthesized by the Catecholate Process
Effect of Calcination Temperature on Phase Transformation and Particle size of Barium Titanate Fine Powders Synthesized by the Catecholate Process
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焙烧温度对儿茶酚法合成钛酸钡细粉相变和粒径的影响
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
S. Phanichphant
中科院分区：
文献类型：
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作者：
S. Ananta;T. Tunkasiri;P. Thavornyutikarn;S. Phanichphant
提出了一种改进的邻苯二酚法制备高纯钛酸钡微粉的方法。以TiCl4、C6H4(OH)2和BaCO3为原料，合成了钛-邻苯二酚钡配合物BaTiC6H4O2)。冷冻干燥后，在700~1100℃范围内焙烧3h，用室温X射线衍射仪和扫描电子显微镜研究了焙烧后粉末的相变和颗粒大小。结果表明，成功地获得了类钙钛矿型BaTiO_3相。随着焙烧温度的升高，BaTiO_3由立方相向四方相转变。较高的温度明显有利于颗粒的生长和大而硬的团聚的形成。700℃焙烧后，平均粒径在0.1~0.2微米之间。
A modified catecholate process has been developed for the synthesis of high purity barium titanate fine powders. The barium titanium-catechol complex, Ba(Ti(C6H4O2)3) was prepared from TiCl4, C6H4(OH)2 and BaCO3. The complex was freeze-dried and calcined for 3 hours at temperatures ranging from 700 to 1100°C. Phase transformation and particle size of the calcined powders have been investigated as a function of calcination temperature by room-temperature X-ray diffraction and scanning electron microscopy techniques. It is seen that the perovskite-like phase of BaTiO3 was successfully obtained. With increasing calcining temperature, BaTiO3 transformed from the cubic to the tetragonal phase. Higher temperatures clearly favoured particle growth and the formation of large and hard agglomerates. After calcination at 700°C, the average particle size ranged between 0.1-0.2 µm.