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The effect of two Ag electrodes on the electrical properties of SrTiO3 ring varistors were presented in this paper. It was found that one of them results in ohmic contact while the other results in non-ohmic contact between electrode and ceramics. Compared with the results achieved by using of In-Ga alloy paste, non-ohimic contact lead to larger varistor voltage U10mA, larger nonlinear coefficient...
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