Preparation of rod-shaped BaTiO3 powder
Preparation of rod-shaped BaTiO3 powder
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DOI：
10.1007/bf01117350
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发表时间：
1986-03
影响因子：
4.5
通讯作者：
Y. Hayashi;Toshio Kimura;Takashi Yamaguchi
中科院分区：
文献类型：
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作者：
Y. Hayashi;Toshio Kimura;Takashi Yamaguchi
以棒状TiO2·nH2O和baco3为原料，在熔融氯化物中制备了棒状batio3粉末颗粒。参考起始钛化合物的化学种类、氯化物的用量、钛化合物的粒度和反应条件对BaTiO3颗粒形貌的影响，确定了棒状BaTiO3的制备条件：即在熔盐中加入等量的BaTiO3，在700℃下加热较大的TiO2·nH2O颗粒。该条件有效抑制了溶液沉淀过程中BaTiO3的形成，也抑制了TiO2·nH2O或BaTiO3的变形，而这些变形是导致等轴BaTiO3颗粒形成的原因。得到的棒状batio3颗粒具有立方对称性。电子衍射分析表明，其拓扑结构保持如下关系；< 0.1 >四钛酸钾∥< 0.1 >水合二氧化钛∥< 0.1 >锐钛矿∥< 0.1 >钛酸钡
Rod-shaped BaTiO3powder particles have been prepared from rod-shaped TiO2·nH2O and BaCO3in molten chloride. The morphology of BaTiO3particles was studied referring to the effects of the chemical species of the starting titanium compound, amount of chloride, particle size of the titanium compound and reaction conditions, and the preparation condition of rod-shaped BaTiO3has been determined: i.e., large TiO2·nH2O particles were heated at 700°C in molten salt with an equal amount of BaTiO3. This condition was effective in suppressing the formation of BaTiO3by a solution-precipitation process as well as the deformation of either TiO2·nH2O or BaTiO3, which are responsible for the formation of equiaxed BaTiO3particles. The obtained rod-shaped BaTiO3particles had a cubic symmetry. Electron diffraction analysis showed that the following topotactic relation is retained; <0 1 0>potassium tetratitanate∥ <0 1 0>hydrated titania∥ <1 0 0>anatase∥ <1 0 0>barium titanate