| Ba过量对(Ba_(0.8)Pb_(0.2))TiO_3系陶瓷PTC性能的影响 |
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| 引用本文： | 郑锦清,金玲,李旭辉.Ba过量对(Ba_(0.8)Pb_(0.2))TiO_3系陶瓷PTC性能的影响[J].电子元件与材料,2007,26(12):30-31,35. |
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| 作者姓名： | 郑锦清 金玲 李旭辉 |
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| 作者单位： | 华南理工大学,材料学院,广东,广州,510640 |
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| 摘 要： | 借SEM、XRD、R-t,αR及Vb等测试手段,研究了Ba过量对(Ba0.8Pb0.2)TiO3系陶瓷的微结构及PTC性能的影响。结果表明,当Ba过量5.0%(摩尔分数)时,能使晶粒细化,致密度良好,PTC性能得到显著改善:升阻比为4.2,αR为28.9%/℃,Vb≥520 V.mm–1。而Ba过量大于或小于5.0%都会对性能产生恶化作用。通过XRD发现,Ba过量形成的第二相Ba2TiO4及钡空位浓度的减小,是引起变化的重要因素。
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| 关 键 词： | 电子技术 PTC陶瓷 Ba过量 耐电压 升阻比 温度系数 |
| 文章编号： | 1001-2028（2007）12-0030-02 |
| 收稿时间： | 2007-06-18 |
| 修稿时间： | 2007年6月18日 |
Effect of Ba excess on PTC properties of (Ba0.8Pb0.2)TiO3 system ceramics |
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| ZHENG Jin-qing,JIN Ling,LI Xu-hui.Effect of Ba excess on PTC properties of (Ba0.8Pb0.2)TiO3 system ceramics[J].Electronic Components & Materials,2007,26(12):30-31,35. |
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| Authors: | ZHENG Jin-qing JIN Ling LI Xu-hui |
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| Abstract: | The effects of Ba excess on micro structure and PTC properties of(Ba0.8Pb0.2)TiO3 system were investigated by SEM、XRD、R-t curves,αR and Vb.Excellent PTC properties and high density ceramics were obtained for the samples (Ba0.8Pb0.2)TiO3+xBaCO3] with Ba excess addition 5.0%(mole fraction).The jump range is about 4.2,αR= 28.9%/ ℃,and Vb≥520 V.mm–1.When the Ba excess is not equal to 5.0%,the PTC properties will deteriorate.These characteristics are attributed to both the existence of second phase Ba2TiO4 and the decrease of barium vacancies,which result from the Ba excess. |
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| Keywords: | electron technology PTC ceramic Ba excess breakdown voltage jump range temperature coefficient |
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