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高电位梯度 ZnO 压敏陶瓷的制备、性能及机理研究
王发顶
Thesis Advisor康雪雅
2009-06
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Name硕士
Degree Discipline材料物理与化学
KeywordZno 压敏陶瓷 Li 掺杂 高电位梯度 晶界势垒高度 能带
Abstract

本文采用氧化物固相合成法制备了锂受主掺杂高电位梯度ZnO 压敏陶瓷。研究
了Li+掺杂量对高电位梯度ZnO 压敏陶瓷压敏特性的影响;研究了烧结温度对高电位梯度ZnO 压敏陶瓷压敏特性的影响;研究了Li+掺杂对高电位梯度ZnO 压敏陶瓷相组成和微观结构的影响;研究了Li+掺杂对高电位梯度ZnO 压敏陶瓷能带结构的影响;分析了高电位梯度ZnO 压敏陶瓷电位梯度升高的原因;初步探讨了高电位梯度ZnO压敏陶瓷的机理。获得以下主要结论:1. 在一定的烧结温度下有一个掺杂锂含量的合适范围,在此范围可得到综合性能较好的高电位梯度氧化锌压敏陶瓷,如在1125℃烧结温度下,压敏陶瓷材料获得综合压敏特性较好的Li2CO3 掺杂范围是0.05~0.20mol%,此时试样压敏电压为850~1890V/mm,非线性系数为18.7~20,漏电流为10~12μA。2. 在一定的掺杂量含量下有一个烧结温度的合适范围,在此范围可得到综合性能较好的高电位梯度氧化锌压敏陶瓷,如在掺杂0.02mol% Li2CO3 情况下,压敏陶瓷材料获得综合压敏特性较好的烧结温度掺杂范围是1050℃~1100℃,此时试样压敏电压为727~1255V/mm,非线性系数为11.4~20.4,漏电流为2.6~45μA。3. 试样的相组成是氧化锌相、Co7Sb2O12 尖晶石相和富铋相,而没有焦绿石相。4. Li+取代Zn2+形成负电中心,它可以把一个空穴(h+)束缚在自己的周围,在禁带中价带的顶部形成受主能级,引起能带畸变。5. Li+掺杂客观上起到了阻碍相邻ZnO 晶粒相互融合的作用,ZnO 晶粒尺寸的迅速减小和晶界势垒的适当增大是压敏电位梯度急剧增高的主要原因。

Other Abstract

Lithium acceptor doped ZnO varistor ceramics with high voltage-gradient were prepared by solid phase synthesis method. The effect of Li+ doping content and sintering temperature on the electrical properties of ZnO varistor ceramics were studied. And the effect of Li+ dopant on the phase composition & microstructure of ZnO varistor ceramics were studied. And the effects of Li+ dopant on the energy band structure of ZnO varistor ceramics were studied. The reasons of high potential gradient were analyzed and the mechanism of ZnO varistor ceramics with high voltage-gradient was discussed preliminarily. Main conclusions are as follows: 1. At a certain sintering temperature, there is a proper lithium doping content range. In this range, we can obtain high voltage gradient zinc oxide-based varistors with quality comprehensive performance index. For instance, at 1125℃ sintering temperature the proper lithium doping content range is 0.05~0.20mol%( Li2CO3). And the breakdown voltage range, the nonlinear coefficient, the leakage current is respectively 850~1890V/mm, 18.7~20 and 10~12μA. 2. At a certain lithium doping content, there is a proper sintering temperature range. In this range, we can obtain high voltage gradient zinc oxide-based varistors with quality comprehensive performance index. For instance, at 0.02mol%( Li2CO3) lithium doping content proper sintering temperature range is 1050℃~1100℃. And the breakdown voltage range, the nonlinear coefficient, the leakage current is respectively 727~1255V/mm, 11.4~20.4and 2.6~45μA. 3. The phase composition of samples is zinc oxide phase, bismuth trioxide phase and spinel phase Co7Sb2O12. And there is no pyrochlore phase. 4. Substitute Li+ for Zn2+, which brings a bound hole and an additional acceptor level nearby the valence band maximum in the band gap, distorts the energy band. 5. Doping Li+ can hinder the bonding of adjoining ZnO grains. The significant decrease of the ZnO grain size and the increment of grain boundary barrier are the main reasons for raising the voltage gradient.

Document Type学位论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/3572
Collection材料物理与化学研究室
Recommended Citation
GB/T 7714
王发顶. 高电位梯度 ZnO 压敏陶瓷的制备、性能及机理研究[D]. 北京. 中国科学院研究生院,2009.
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