| Formation mechanism of barium titanate nanocrystalis under hydrothermal conditions |
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| 作者姓名： | 仲维卓 夏长泰 施尔畏 王步国 李文军 华素坤 |
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| 作者单位： | Shanghai Institute of Ceramics，Chinese Academy of Sciences，Shanghai 201800，China，Shanghai Institute of Ceramics，Chinese Academy of Sciences，Shanghai 201800，China，Shanghai Institute of Ceramics，Chinese Academy of Sciences，Shanghai 201800，China，Shanghai Institute of Ceramics，Chinese Academy of Sciences，Shanghai 201800，China，Shanghai Institute of Ceramics，Chinese Academy of Sciences，Shanghai 201800，China，Shanghai Institute of Ceramics，Chinese Academy of Sciences，Shanghai 201800，China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China. |
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| 摘 要： | Growth units and the crystallization habit of BaTiO3 nanocrystals have been investigated. It has been proposed that the growth units of BaTiO3 were surface hydroxylated Ti(OH)62- octahedra. The relationship between crystal morphology and the variation of the current intensity in the solution has been obtained through the measurement of the OH in the solution and the hydrothermal experiment with superimposed direct electric field. Based on the computation of the stability energy of the growth units, the relationship between the crystallized morphology of crystallites and the most favorable growth units under different conditions has been derived. It has been found that there is structure similarity between anatase (TiO2) and BaTiO3 from the crystal chemistry viewpoint, so they are soluble in each other, which can serve as a reasonable explanation for the abnormal phenomenon of the retention of cubic substable phase at room temperature.
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Formation mechanism of barium titanate nanocrystalis under hydrothermal conditions |
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| ZHONG Weizhuo XIA Changtai SHI ErweiWANG Buguo LI Wenjun and HUA Sukun.Formation mechanism of barium titanate nanocrystalis under hydrothermal conditions[J].Science in China(Technological Sciences),1997(5). |
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| Authors: | ZHONG Weizhuo XIA Changtai SHI ErweiWANG Buguo LI Wenjun and HUA Sukun |
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| Abstract: | Growth units and the crystallization habit of BaTiO3 nanocrystals have been investigated. It has been proposed that the growth units of BaTiO3 were surface hydroxylated Ti(OH)62- octahedra. The relationship between crystal morphology and the variation of the current intensity in the solution has been obtained through the measurement of the OH in the solution and the hydrothermal experiment with superimposed direct electric field. Based on the computation of the stability energy of the growth units, the relationship between the crystallized morphology of crystallites and the most favorable growth units under different conditions has been derived. It has been found that there is structure similarity between anatase (TiO2) and BaTiO3 from the crystal chemistry viewpoint, so they are soluble in each other, which can serve as a reasonable explanation for the abnormal phenomenon of the retention of cubic substable phase at room temperature. |
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| Keywords: | growth unit coordination anion polyhedron stability energy crystallization habit |
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