Title :
Improvement of non-linear characteristics of multicomponent ZnO-based ceramics containing Nb2O5
Author :
Asokan, T. ; Nagabhushana, G.R. ; Iyengar, G.N.K.
Author_Institution :
Indian Inst. of Sci., Bangalore, India
fDate :
4/1/1988 12:00:00 AM
Abstract :
The combined effect of minor variations in the Nb2O5 content and initial particle size on the current-voltage characteristics and energy handling capability of ZnO-based composites is reported. Samples containing 0.2 wt.% of Nb2O5 along with other additive oxides, prepared as a finely milled mixture, were found to possess the best overall properties, characterized by high nonlinearity index (≃60), low leakage current (0.6-1.2 μA/cm2) long life (>150 y), among the samples studied. Addition of Nb2O5 above 0.2 wt.%, maintaining other parameters constant, was found to degrade the electrical characteristics due to the excessive formation of Zn3Nb2O8 spinel phase
Keywords :
niobium compounds; surge protection; varistors; zinc compounds; 150 y; Nb2O5 content; Zn3Nb2O8 spinel phase; ZnO-Nb2O5 ceramics; ZnO-based ceramics; additive oxides; current-voltage characteristics; electrical characteristics; energy handling capability; finely milled mixture; initial particle size; nonlinear resistors; nonlinearity index; surge arrestors; voltage dependent resistors; Additives; Arresters; Ball milling; Ceramics; Coatings; Niobium; Resistors; Surface charging; Surge protection; Zinc oxide;
Journal_Title :
Electrical Insulation, IEEE Transactions on
