Influence of the common varistor dopants (CoO, Cr2O3 and Nb2O5) on the structural properties of SnO2 ceramics

被引:35
|
作者
Brankovic, G
Brankovic, Z
Davolos, MR
Cilense, M
Varela, JA
机构
[1] Univ Belgrade, Ctr Multidisciplinary Studies, YU-11030 Belgrade, Serbia Monteneg, Serbia
[2] UNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
[3] Univ Belgrade, Fac Technol & Met, YU-11000 Belgrade, Serbia
基金
巴西圣保罗研究基金会;
关键词
ceramics; infrared (IR) spectroscopy; energy dispersive X-ray analysis (EDS); scanning electron microscopy (SEM);
D O I
10.1016/j.matchar.2002.11.001
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The influence of dopants commonly used in SnO2 varistor ceramics, such as CoO, Cr2O3 or Nb2O5, on the structural properties of SnO2 was investigated. Several SnO2-based ceramics containing only one of the dopants were prepared and characterized. Spectroscopic investigations [visible, near infrared (IR) and IR region] were performed to obtain information about dopants valence states inside the ceramics, as well as about their influence on electronic structure of the material. Structural properties were investigated by X-ray diffraction analysis and mechanisms of dopant incorporation were proposed. Obtained results were confirmed with results of the electrical measurements. Microstructural changes in doped ceramics were investigated by scanning electron microscopy (SEM) analysis that showed great differences in densities, grain size, and morphology of the SnO2 ceramics depending on type of dopants and their distribution. (C) 2004 Published by Elsevier Inc.
引用
收藏
页码:243 / 251
页数:9
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