Voltage polarity dependent current paths through polycrystalline ZnO varistors

被引：12
|
作者：
Hofstaetter, Michael [1 ]
Nevosad, Andreas [2 ]
Teichert, Christian [2 ]
Supancic, Peter [1 ]
Danzer, Robert [1 ]
机构：
[1] Univ Leoben, Inst Struktur & Funkt Keram, A-8700 Leoben, Austria
[2] Univ Leoben, Inst Phys, A-8700 Leoben, Austria
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2013年 / 33卷 / 15-16期
关键词：
Varistor; Asymmetric; Polarity; Currentpaths; Thermography; ATOMIC-FORCE MICROSCOPY; ZINC-OXIDE VARISTORS; GRAIN-BOUNDARIES; BARRIER STRUCTURE; INTERFACES; TRANSPORT; ELECTROCERAMICS; SPECTROSCOPY; BICRYSTAL; CERAMICS;
D O I：
10.1016/j.jeurceramsoc.2013.06.017
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Due to the scatter of properties of individual grain boundaries, a scatter of the behavior of low-voltage varistor components and asymmetric current voltage characteristics with respect to the electrical field direction is observed. Using complementary methods (thermography, scanning surface probe microscopy, electron back-scattered diffraction), we investigated the grain boundary behavior of Praseodymium type varistors. Measurements on the relevant grain boundaries revealed a newly observed effect: dependent on the field direction, the main current flows via different spatial paths. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：3473 / 3476
页数：4
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