The preparation and properties of (La,Sr)-doped TiO_2 varistors are systematically investigated.Samples have sensitive voltage (V_(1 mA)) of 8～38 V·mm~(-1), nonlinear coefficient of 3～5.5 and dielectric constant of 10~5.The sensitive voltage is greatly reduced from 27～38 V·mm~(-1)to 8～15 V·mm~(-1)with the reduction of thickness, however, nonlinear coefficient and dielectric constant are not affected by surface layer, which is mainly relevant to the oxidized surface layer caused by diffusion of oxygen at the...
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