| La3+掺杂对BaTiO3纳米陶瓷微观结构及其性能的影响 |
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| 引用本文： | 宿杰,王立群,何聚,余大书. La3+掺杂对BaTiO3纳米陶瓷微观结构及其性能的影响[J]. 天津师范大学学报(自然科学版), 2006, 26(4): 19-22 |
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| 作者姓名： | 宿杰 王立群 何聚 余大书 |
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| 作者单位： | 天津师范大学,物理与电子信息学院,天津,300074 |
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| 基金项目： | 天津师范大学校科研和教改项目;天津师范大学校科研和教改项目 |
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| 摘 要： | 采用sol-gel法制备了La^3＋掺杂BaTiO3纳米陶瓷．用DTA-DTG，XRD，PAT和PIA等对目标产物进行分析测试．研究结果表明，在800℃下煅烧2h得到粒径约为50～70nmBaTiO3纳米粉体，La^3＋的掺杂可以降低BaTiO3纳米晶体的烧结温度并使其晶格发生收缩畸变,当0≤x≤0．2，产生弱束缚电子从而导致电阻率降低；当0．2≤x≤0．4产生钡空穴从而导致电阻率升高．
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| 关 键 词： | 溶胶凝胶法 La3 掺杂 电阻率 |
| 文章编号： | 1671-1114(2006)04-0019-04 |
| 修稿时间： | 2006-03-16 |
Effects on Microstructure and Characteristics of BaTiO3 Nanometer Ceramics by La3+ -doping |
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| SU Jie,WANG Li-qun,HE Ju,YU Da-shu. Effects on Microstructure and Characteristics of BaTiO3 Nanometer Ceramics by La3+ -doping[J]. Journal of Tianjin Normal University(Natural Science Edition), 2006, 26(4): 19-22 |
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| Authors: | SU Jie WANG Li-qun HE Ju YU Da-shu |
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| Abstract: | Ba1-xLaxTiO3 (abbreviated as BLT) nanometer ceramics were prepared by sol-gel process. The samples were investigated by differential thermal analysis and differential thermal gravimetric analysis (DTA-DTG), X-ray diffraction (XRD), positron annihilation technique (PAT) and precision impedance analysis (PIA). The results showed that the BaTiO3 nanometer powder with cubic perovskite structure in size of 50-70 nm is obtained at 800 ℃ sintering for 2 h. The doping of La3+ resulted in the decreasing of the sintering temperature and the shrinking of the crystal lattice. The doping of La3+ induced the declining of the resistivity due to the formation of the weak bound electrons(Ti4+ · e- ) in the range of 0≤x≤0.2 and the rising of the resistivity due to the formation of the barium vacancy (V″Ba) in the range of 0.2≤x≤0.4. |
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| Keywords: | BaTiO3 sol-gel process BaTiO3 La3 -doped resistivity |
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