| Lanthanum-doped Bi4Ti3O12 ceramics prepared by high-pressure technique |
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| 作者姓名： | 林雪 关庆丰 刘洋 李海波 |
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| 作者单位： | School of Materials Science and Engineering, Jiangsu University College of Chemistry, Key Laboratory of Preparation and Application Environmentally Friendly Materials of the Ministry of Education, Jilin Normal University College of Physics, Jilin Normal University |
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| 基金项目： | Project supported by the Science Development Project of Jilin Province of China (Grant No. 20090144). |
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| 摘 要： | We present an effective way in this paper to increase the density of lanthanum doped bismuth titanate ceramics, Bi4-xLaxTi3O12 (BLT), thereby significantly improving the performance of the BLT ceramics. Dense BLT ceramicses, Bi4-xLaxTi3O12 (x = 0.25, 0.5, 0.75, 1.0), are prepared by using nanocrystalline powders fabricated by a-gel method and high-pressure technique. The microstructures of the BLT ceramicses prepared separately by conventional-pressure and high-pressure techniques are investigated by using x-ray diffraction and transmission electron microscope. The influence of La-doping on the densification of bismuth titanate ceramics is investigated. The experimental results indicate that the phase compositions of all samples with various lanthanum dopings sintered at 900°C possess layer-structure of Bi4Ti3O12 . The green compacts are pressed under 2.5 GPa, 3.0 GPa, 3.5 GPa and 4.0 GPa, separately. It is found that the density of BLT ceramics is significantly increased due to the decreasing of porosity in the green compacts by high-pressure process.
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| 关 键 词： | bismuth titanate ceramics lanthanum doping high-pressure technique densification |
| 收稿时间： | 4/2/2010 12:00:00 AM |
| 修稿时间： | 5/4/2010 12:00:00 AM |
Lanthanum-doped Bi4Ti3O12 ceramics prepared by high-pressure technique |
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| Lin Xue,Guan Qing-Feng,Liu Yang and Li Hai-Bo.Lanthanum-doped Bi4Ti3O12 ceramics prepared by high-pressure technique[J].Chinese Physics B,2010,19(10):107701-107701. |
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| Authors: | Lin Xue Guan Qing-Feng Liu Yang and Li Hai-Bo |
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| Institution: | School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; College of Chemistry, Key Laboratory of Preparation and Application Environmentally Friendly
Materials of the Ministry of Education, Jilin Normal University, Siping;School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; College of Physics, Jilin Normal University, Siping 136000, China;College of Physics, Jilin Normal University, Siping 136000, China |
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| Abstract: | We present an effective way in this paper to increase the density of lanthanum doped bismuth titanate ceramics, Bi4-xLaxTi3O12 (BLT), thereby significantly improving the performance of the BLT ceramics. Dense BLT ceramicses, Bi4-xLaxTi3O12 (x = 0.25, 0.5, 0.75, 1.0), are prepared by using nanocrystalline powders fabricated by a --gel method and high-pressure technique. The microstructures of the BLT ceramicses prepared separately by conventional-pressure and high-pressure techniques are investigated by using x-ray diffraction and transmission electron microscope. The influence of La-doping on the densification of bismuth titanate ceramics is investigated. The experimental results indicate that the phase compositions of all samples with various lanthanum dopings sintered at 900 du possess layer-structure of Bi4Ti3O12. The green compacts are pressed under 2.5 GPa, 3.0 GPa, 3.5 GPa and 4.0 GPa, separately. It is found that the density of BLT ceramics is significantly increased due to the decreasing of porosity in the green compacts by high-pressure process. |
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| Keywords: | bismuth titanate ceramics lanthanum doping high-pressure technique densification |
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