Lanthanum-doped Bi4Ti3O12 ceramics prepared by high-pressure technique

doi:10.1088/1674-1056/19/10/107701

中国物理B ›› 2010, Vol. 19 ›› Issue (10): 107701-107701.doi: 10.1088/1674-1056/19/10/107701

Lanthanum-doped Bi₄Ti₃O₁₂ ceramics prepared by high-pressure technique

李海波¹, 关庆丰², 林雪³, 刘洋⁴

(1)College of Physics, Jilin Normal University, Siping 136000, China; (2)School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; (3)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; (4)School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; College of Physics, Jilin Normal University, Siping 136000, China

收稿日期:2010-04-02 修回日期:2010-05-04 出版日期:2010-10-15 发布日期:2010-10-15
基金资助:
Project supported by the Science Development Project of Jilin Province of China (Grant No. 20090144).

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

Received:2010-04-02 Revised:2010-05-04 Online:2010-10-15 Published:2010-10-15
Supported by:
Project supported by the Science Development Project of Jilin Province of China (Grant No. 20090144).

摘要/Abstract

摘要： We present an effective way in this paper to increase the density of lanthanum doped bismuth titanate ceramics, Bi_4-xLa_xTi₃O₁₂ (BLT), thereby significantly improving the performance of the BLT ceramics. Dense BLT ceramicses, Bi_4-xLa_xTi₃O₁₂ (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℃ 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.

Abstract: We present an effective way in this paper to increase the density of lanthanum doped bismuth titanate ceramics, Bi_4-xLa_xTi₃O₁₂ (BLT), thereby significantly improving the performance of the BLT ceramics. Dense BLT ceramicses, Bi_4-xLa_xTi₃O₁₂ (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.

Key words: bismuth titanate ceramics, lanthanum doping, high-pressure technique, densification

中图分类号: (Other materials)

61.72.up

62.50.-p (High-pressure effects in solids and liquids) 81.05.Je (Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)) 81.20.Ev (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation) 81.20.Fw (Sol-gel processing, precipitation)

林雪, 关庆丰, 刘洋, 李海波. Lanthanum-doped Bi₄Ti₃O₁₂ ceramics prepared by high-pressure technique[J]. 中国物理B, 2010, 19(10): 107701-107701.

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[J]. Chin. Phys. B, 2010, 19(10): 107701-107701.

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Lanthanum-doped Bi₄Ti₃O₁₂ ceramics prepared by high-pressure technique

Lanthanum-doped Bi₄Ti₃O₁₂ ceramics prepared by high-pressure technique

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