Solid State Science and Technology, Vol. 17, No 2 (2009) 175-181

 

ISSN 0128-7389

Corresponding Author: mgm.sabri@gmail.com

175

 

EFFECT OF DC AND TEMPERATURE STRESSES ON

NONLINEAR COEFFICIENT OF ZnO CERAMIC VARISTORS

 

M.G.M. Sabri, B.Z. Azmi, M. Hashim, Zahid Rizwan, M.K. Halimah,

H.A.A. Sidek, S.A. Warid and A.N. Fauzana

Department of Physics, Faculty of Science, Universiti Putra Malaysia,

43400 UPM Serdang, Selangor.

 

ABSTRACT

DC and temperature stresses deterioration were investigated to see the changes of

nonlinear coefficient in Zn-Bi-Ti oxide low-voltage ceramics varistors that were

sintered at various sintering temperatures from 1140C to 1230C and two sintering

duration time of 45 and 90 minutes. The sintered ceramic was characterized with XRD,

observed with VPSEM for surface morphology, analysed with EDAX for elemental

analysis at particular sample area. The sintered ceramics density were observed to

decrease with increasing sintering temperature and the Zn-Bi-Ti oxide ceramic sintered

at 1140 C for 45 minutes was found to have the maximum nonlinear coefficient. After

applying DC and temperature stresses of 0.75V1mA/ 80C/ 12 h, the nonlinear coefficient

value in 90 minutes sintering time decreased with sintering temperature.

 

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