| Preparation and structure characteristics of nano-Bi2O3 powders with mixed crystal structure |
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| 引用本文： | 李卫. Preparation and structure characteristics of nano-Bi2O3 powders with mixed crystal structure[J]. 中南工业大学学报(英文版), 2005, 12(3): 243-245. DOI: 10.1007/s11771-005-0135-5 |
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| 作者姓名： | 李卫 |
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| 作者单位： | StateKeyLaboratoryofPowderMetallurgy,CentralSouthUniversity,Changsha410083,China |
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| 摘 要： | The nano-Bi2O3 powders were prepared by a chemical precipitation method with Bi(NO3)3, HNO3 and NaOH as reactants. The structural characteristics and morphology of nano-Bi2O3 powders were investigated by X-ray diffraction and transmission electron microscopy, respectively. The results show that under the optimum condition that 300g/L Bi(NO3)3 reacts at 90℃ for 2 h, the Bi203 powders with 60 nm on the average and 99.5% in purity are obtained. The prepared nano-Bi2O3 powders contain a mixed crystal structure of monoclinic and triclinic instead of traditional structure of monoclinic α-Bi2O3. And the mixed crystal structure is stable in air. The reason for the appearance of the mixed crystal structure may be that the ionic radius ratio of Bi^3 to O^2- changes easily during the formation of nano-Bi2O3 particles by a chemical precipitation method.
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| 关 键 词： | 纳米Bi2O3粉末 化学沉淀法 混合晶体 结构特征 |
| 收稿时间： | 2005-01-27 |
| 修稿时间： | 2005-03-28 |
Preparation and structure characteristics of nano-Bi2O3 powders with mixed crystal structure |
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| Li Wei. Preparation and structure characteristics of nano-Bi2O3 powders with mixed crystal structure[J]. Journal of Central South University of Technology, 2005, 12(3): 243-245. DOI: 10.1007/s11771-005-0135-5 |
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| Authors: | Li Wei |
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| Affiliation: | (1) State Key Laboratory of Powder Metallurgy, Central South University, 410083 Changsha, China |
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| Abstract: | The nano-Bi2O3 powders were prepared by a chemical precipitation method with Bi(NO3)3, HNO3 and NaOH as reactants. The structural characteristics and morphology of nano-Bi2O3 powders were investigated by X-ray diffraction and transmission electron microscopy, respectively. The results show that under the optimum condition that 300 g/L Bi(NO3)3 reacts at 90°C for 2 h, the Bi2O3 powders with 60 nm on the average and 99.5% in purity are obtained. The prepared nano-Bi2O3 powders contain a mixed crystal structure of monoclinic and triclinic instead of traditional structure of monoclinic α-Bi2O3. And the mixed crystal structure is stable in air. The reason for the appearance of the mixed crystal structure may be that the ionic radius ratio of Bi3+ to O2− changes easily during the formation of nano-Bi2O3 particles by a chemical precipitation method. Foundation item: Project (2003AA305820) supported by the National High Technology Research Plan of China |
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| Keywords: | nano-Bi2O3 powders chemical precipitation method mixed crystal structure |
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