| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Lanthanum-doped Bi4Ti3O12 ceramics prepared by high-pressure technique |
| Lin Xue(林雪)a)b), Guan Qing-Feng(关庆丰)a)†, Liu Yang(刘洋)a)c), and Li Hai-Bo(李海波)c) |
| a School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; b College of Chemistry, Key Laboratory of Preparation and Application Environmentally Friendly Materials of the Ministry of Education, Jilin Normal University, Siping 136000, China; c 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 sol–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℃ 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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Received: 02 April 2010
Revised: 04 May 2010
Accepted manuscript online:
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PACS:
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61.72.up
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(Other materials)
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62.50.-p
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(High-pressure effects in solids and liquids)
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81.05.Je
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(Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))
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81.20.Ev
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(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
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81.20.Fw
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(Sol-gel processing, precipitation)
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| Fund: Project supported by the Science Development Project of Jilin Province of China (Grant No. 20090144). |
Cite this article:
Lin Xue(林雪), Guan Qing-Feng(关庆丰), Liu Yang(刘洋), and Li Hai-Bo(李海波) Lanthanum-doped Bi4Ti3O12 ceramics prepared by high-pressure technique 2010 Chin. Phys. B 19 107701
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