ZnO-Bi_2O_3二元陶瓷粉体电化学行为研究  

The Electrochemical Behavior of ZnO-Bi_2O_3 Ceramic Powders

作　　者：王艳珍[1,2] 钟庆东 巫欣欣[4] 施利毅[1] 

机构地区：[1]上海大学纳米科学与技术研究中心,上海200444 [2]上海大学环境与化学工程学院,上海200072 [3]上海市现代冶金与材料制备重点实验室,上海200072 [4]上海大学理学院,上海200444

出　　处：《化学学报》2009年第15期1743-1748,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.50571059;50615024);教育部新世纪优秀人才支持计划(No.NCET-07-0536);上海市教育委员会重点学科建设(No.J50102);教育部创新团队计划(No.IRT0739)资助项目

摘　　要：采用电化学阻抗谱和电位-电容测试及Mott-Schottky分析技术研究了ZnO-Bi2O3粉体电极在0.5mol/LNaCl溶液中的电化学行为.研究表明,ZnO-Bi2O3粉体表现为n型半导体;随着Bi2O3含量的增加或混合时间的延长,粉体的阻抗增大,空间电荷层电容Csc减小,载流子浓度ND减小;经高温烧结成二元压敏陶瓷,随着混合时间的延长,电阻片综合电性能越好.该方法可有效评价二元陶瓷粉体混合均匀性.The electrochemical behavior of ZnO-Bi2O3 powder electrode immersed in 0.5 mol/L NaCl solu- tion were investigated by the electrochemical impedance spectroscopy and potential-capacitance methods combining with Mott-Schottky analysis. The result showed that the powder electrodes showed n-type semi- conductor. With increasing of the Bi2O3 content in the ZnO powder and prolongation of mixing time, the electrochemical impedance spectrum （EIS） impedance of the electrodes increased gradually, the Csc of the powder electrode decreased gradually, and the charge carrier density decreased. After sintering at high tem- perature, also prolongation of mixing time, the binary ZnO-Bi2O3 ceramics showed better electric character- istics. It was suggested that this could be an effective method for evaluating the homogeneity for blending of binary ceramics.

关 键 词：电化学阻抗谱 电位-电容法 Mott-Schottky分析 载流子浓度 

分 类 号：TQ174.1[化学工程—陶瓷工业]