| Microstructure and electrical properties of Y2O3-doped ZnO-based varistor ceramics prepared by high-energy ball milling |
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| 作者姓名： | Hongyu Liu Xueming Ma Dongmei Jiang Wangzhou Shi |
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| 作者单位： | [1]College of Science, Wuhan University of Science and Technology, Wuhan 430081, China [2]Department of Physics, East China Normal University, Shanghai 200062, China |
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| 摘 要： | Y2O3-doped ZnO-based varistor ceramics were prepared using high-energy ball milling （HEBM） and low-temperature sin- tering technique, with voltage-gradient of 1934-2197 V/mm, non-linear coefficients of 20.8-21.8, leakage currents of 0.59-1.04 μA, and densities of 5.46-5.57 g/cm3. With increasing Y2O3 content, the voltage-gradient increases because of the decrease of ZnO grain size; the non-linear coefficient and the leakage current improve but the density decreases because of more porosity; the donor con- centration and density of interface states decrease, whereas the barrier height and width increase because of the acceptor effect of Y2O3 in varistor ceramics.
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| 关 键 词： | 球磨研磨 显微结构 电学特性 氧化锌 氧化钇 变阻器 陶瓷 低温烧结 |
| 收稿时间： | 14 July 2006. |
| 修稿时间： | 2006-07-14 |
Microstructure and electrical properties of Y2O3-doped ZnO-based varistor ceramics prepared by high-energy ball milling |
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| Hongyu Liu Xueming Ma Dongmei Jiang Wangzhou Shi.Microstructure and electrical properties of Y2O3-doped ZnO-based varistor ceramics prepared by high-energy ball milling[J].Journal of University of Science and Technology Beijing,2007,14(3):266-270. |
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| Authors: | Hongyu Liu Xueming Ma Dongmei Jiang Wangzhou Shi |
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| Affiliation: | 1. College of Science, Wuhan University of Science and Technology, Wuhan 430081, China
2. Department of Physics, East China Normal University, Shanghai 200062, China |
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| Abstract: | Y2O3-doped ZnO-based varistor ceramics were prepared using high-energy ball milling (HEBM) and low-temperature sintering technique, with voltage-gradient of 1934-2197 V/mm, non-linear coefficients of 20.8-21.8, leakage currents of 0.59-1.04 μA,and densities of 5.46-5.57 g/cm3. With increasing Y2O3 content, the voltage-gradient increases because of the decrease of ZnO grain size; the non-linear coefficient and the leakage current improve but the density decreases because of more porosity; the donor concentration and density of interface states decrease, whereas the barrier height and width increase because of the acceptor effect of Y2O3 in varistor ceramics. |
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| Keywords: | inorganic materials electrical properties high-energy ball milling varistor microstructure low-temperature sintering zinc oxide yttrium oxide |
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