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The work aims the improvement of nonlinear coefficient ( ) can achieve by the addition of MnO 2 . The investigation regarding to the variation of MnO 2 doping on ZnO-Bi 2 O 3 -TiO 2 system is discussed. The crystalline phases were identified by an XRD (PANalytical (Philips) X’Pert Pro PW3040/60) with CuK  radiation and the data were analyzed by using X’Pert High Score software. The density of varistor ceramics was measured by the geometrical method. The current-voltage characteristics of the varistor ceramics were evaluated. The average grain size ( ) was determined by lineal intercept method. The  of ZnO doped with 0.5 mol% of Bi 2 O 3 , 0.5 mol% of TiO 2 and x mol% of MnO 2 was calculated from data analysis of current-voltage characteristics obtained through a Source Measure Unit (Keithley 236). The calculation of is done by using Origin Pro8.0 software which at low concentration at 1170 o C has the value 10.36 and 9.21 at 45 and 90 min sintering time, respectively, and then decreases to 5.63 and 5.27 at 0.8 mol% MnO 2 concentrations. The addition of MnO 2 dopant in Zn-Bi-Ti oxide ceramics sintered at 45 minutes cause the value of  to increase up to 0.4 mol% and decrease after further addition.

EFFECT OF MNO2 DOPING ON NONLINEAR COEFFICEINT OF ZN-BI-TI-O VARISTOR CERAMICS