| 晶界氧吸附对SrTiO3基压敏陶瓷的作用 |
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| 引用本文： | 李建英 李盛涛. 晶界氧吸附对SrTiO3基压敏陶瓷的作用[J]. 稀有金属材料与工程, 2005, 34(11): 1730-1733 |
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| 作者姓名： | 李建英 李盛涛 |
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| 作者单位： | 西安交通大学,电力设备电气绝缘国家重点实验室,陕西,西安,710049 |
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| 基金项目： | 国家自然科学基金资助项目（50307010） |
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| 摘 要： | 研究了SrTiO3基压敏陶瓷热处理过程中氧的作用。发现SrTiO3基压敏陶瓷的压敏电压U10mA与试样的厚度无关，且随着热处理温度的升高而增大。进一步的试验表明SrTiO3基压敏陶瓷的压敏特性主要受试样表面高阻层的控制。X射线光电子能谱（XPS）的Mn2p和O1s谱图表明，表面高阻层是氧在热处理过程中通过晶界的扩散和化学吸附产生的。因此，氧在晶界处的化学吸附是SrTiO3基陶瓷压敏特性产生的根源。
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| 关 键 词： | SrTiO3陶瓷 晶界 压敏电阻 |
| 文章编号： | 1002-185X(2005)11-1730-04 |
| 收稿时间： | 2004-07-31 |
| 修稿时间： | 2005-07-07 |
The Role of Oxygen on SrTiO3 Based Varistor Ceramics |
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| Li Jianying,Li Shengtao. The Role of Oxygen on SrTiO3 Based Varistor Ceramics[J]. Rare Metal Materials and Engineering, 2005, 34(11): 1730-1733 |
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| Authors: | Li Jianying Li Shengtao |
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| Abstract: | The role of oxygen in the heat treatment process of SrTiO3 varistor ceramics has been investigated. It is found that the varistor voltage of SrTiO3 ceramics independent of the sample thickness, and it increases with the heat treatment temperatures increase, that the dielectric property is mainly governed by a highly resistive surface layer. The XPS results of Mn 2p and O 1s suggest that the surface layer was formed by oxygen diffusion and surface chemisorption at grain boundaries during the heat treatment in air. The chemisorption of oxygen in grain boundaries, which leads to the highly resistive surface layer, is the origin of the varistor behavior of SrTiO3 ceramics. |
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| Keywords: | SrTiO3 ceramics grain boundary varistor |
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