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We present a remarkable effect of Mn doping on the dielectric and nonlinear electric properties of CaCu3Ti4O12 ceramics. The results indicate that only 2.5at.% Mn doping can suppress the dielectric permitivity in CaCu3Ti4O12 by up to two orders of magnitude (from 104 to 102), and the nonlinear varistor characteristics disappear completely, which should be mainly ascribed to the decrease of potential barrier height at the grain boundary and charge compensation for the conduction electrons caused by the Mn doping.
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Cai et al. (2007) studied this question.
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