Fe元素对ZnO陶瓷晶界电性能的影响机理研究  

Research on the Influencing Mechanism of Fe on the Electrical Characteristics of ZnO Grain Boundary

作　　者：王立惠[1,2] 甘国友[1,2] 孙加林[1,2] 严继康[1,2] 

机构地区：[1]昆明理工大学材料与冶金工程学院,昆明650093 [2]中国有色矿业集团有限公司,北京100055

出　　处：《材料导报》2009年第8期28-30,共3页Materials Reports

基　　金：云南省科技攻关项目(2002GG09);昆明理工大学科研基金项目(2007-15)

摘　　要：研究了不同浓度的Fe2O3掺杂对ZnO陶瓷压敏特性的影响,实验表明,随Fe掺杂量增加,ZnO平均晶粒尺寸逐渐变大,压敏电压升高,非线性系数先增大后减小,漏电流先减小后增大。分析认为,Fe元素掺杂对ZnO陶瓷电性能的影响不仅与电子的能级有关,还与其自旋特性紧密相连。ZnO中掺杂的Fe元素随机取代其中的部分Zn原子后,Fe3+或Fe2+在ZnO中产生局域磁矩,会对与其取向不同的自旋电子产生强的散射,这样可增大ZnO陶瓷的电阻率,Fe元素在晶界的偏析可产生和提高其非线性特性。The effects of different contents of Fe2O3 doping on the current-voltage characteristics of ZnO varistor are summarized. It is found that the average grain size of ZnO and the breakdown voltage gradient increase with the increase of Fe content, the nonlinearity coefficients first greatly increase and then decrease, but leakage current density decreases and then increases. The current-voltage characteristics of ZnO not only depend on the electronic energy level structure, but also are associated with electronic spin of Fe. Portion of Zn in ZnO crystal is randomly substituted by Fe, the Fe gives rise to localized magnetic moments and highly scattering to electronics with different spin orientation, favorable for increasing the resistivity and nonlinear characteristics of ZnO varistor.

关 键 词：压敏材料 电性能 过渡元素 自旋相关输运 

分 类 号：TQ172.16[化学工程—水泥工业] TN304.82[化学工程—硅酸盐工业]