Electrical properties of new tin dioxide varistor ceramics at high currents

New dense SnO2-based varistor ceramics with high nonlinear current–voltage characteristics (nonlinearity coefficients are of approximately 50) in a system of SnO2–CoO–Nb2O5–Cr2O3–Y2O3–SrO–MgO are reported. The current–voltage behaviour at high currents is studied by using exponential voltage pulses....

Full description

Saved in:
Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-11, Vol.32 (14), p.3801-3807
Main Authors: Lu, Zhen-Ya, Glot, A.B., Ivon, A.I., Zhou, Zi-Yang
Format: Article
Language:English
Subjects:
Breakdown
Ceramics
Electrical properties
Electrical resistivity
Electronic devices
Grain resistivity
Grains
Tin dioxide
Tin oxides
Varistors
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:New dense SnO2-based varistor ceramics with high nonlinear current–voltage characteristics (nonlinearity coefficients are of approximately 50) in a system of SnO2–CoO–Nb2O5–Cr2O3–Y2O3–SrO–MgO are reported. The current–voltage behaviour at high currents is studied by using exponential voltage pulses. The obtained SnO2 varistor ceramics exhibit low grain resistivity values of 0.23–0.64ohmcm. To date, such values are the lowest known for SnO2 varistors, and are closely approaching the grain resistivity of the ZnO varistor. The current–voltage characteristics of the obtained SnO2-based varistor materials are reproducible in a wide current range from 10−11 to approximately 104Acm−2. The minimum current density and the minimum electric field necessary to cause the irreversible electrical breakdown are measured. It is established that a decrease in the grain resistivity leads to an increase in the minimum current density necessary for irreversible electrical breakdown to occur.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2012.05.029