Solid State Science and Technology, Vol. 17, No 2 (2009) 175-181
Corresponding Author: firstname.lastname@example.org
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.
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 1140°C to 1230°C 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/ 80°C/ 12 h, the nonlinear coefficient
value in 90 minutes sintering time decreased with sintering temperature.
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