Preparation and Characterization of Bi4Ti3O12 Platelets by a Novel Low-temperature Molten Salt System
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2009年第2期
论文作者：隋万美
文章页码：241 - 244
摘 要：Bismuth titanate （Bi4Ti3O12） platelets were prepared by molten salt method in a new salt system of CaCl2-NaCl at 650-750 ℃, using bismuth nitrate pentahydrate （Bi （NO3）3·H2O） and titanium butoxide （Ti （OC4H9）4） as raw materials. The synthesis temperature of Bi4Ti3O12 platelets was decreased to 650 ℃ from 900-1100 ℃. The phase compositions and crystalline morphology of Bi4Ti3O12 platelets were investigated by XRD and SEM. The experimental results indicate that Bi4Ti3O12 platelets containing tetragonal and orthorhombic phase with the size of 1-3 μm can be synthesized at 650 ℃ for 2 h, and the orthorhombic phase becomes the dominant phase at 750 ℃ for 5 h. The size and proportion of Bi4Ti3O12 platelets increase with the increment of the calcining temperature and holding time. The proportion of platelets increases to about ninety percent, and the platelets grow up to about 3-10 μm at 750 ℃ for 5 h from 1-2 μm at 650 ℃ for 2 h. This technical route provides a new low-temperature molten salt system for preparing platelets by molten salt methods.
隋万美
College of Physics Science, Qingdao University
摘 要：Bismuth titanate （Bi4Ti3O12） platelets were prepared by molten salt method in a new salt system of CaCl2-NaCl at 650-750 ℃, using bismuth nitrate pentahydrate （Bi （NO3）3·H2O） and titanium butoxide （Ti （OC4H9）4） as raw materials. The synthesis temperature of Bi4Ti3O12 platelets was decreased to 650 ℃ from 900-1100 ℃. The phase compositions and crystalline morphology of Bi4Ti3O12 platelets were investigated by XRD and SEM. The experimental results indicate that Bi4Ti3O12 platelets containing tetragonal and orthorhombic phase with the size of 1-3 μm can be synthesized at 650 ℃ for 2 h, and the orthorhombic phase becomes the dominant phase at 750 ℃ for 5 h. The size and proportion of Bi4Ti3O12 platelets increase with the increment of the calcining temperature and holding time. The proportion of platelets increases to about ninety percent, and the platelets grow up to about 3-10 μm at 750 ℃ for 5 h from 1-2 μm at 650 ℃ for 2 h. This technical route provides a new low-temperature molten salt system for preparing platelets by molten salt methods.
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