Abstract
We present a remarkable effect of Ce doping on the dielectric and nonlinear electric properties of CaCu3Ti4O12 ceramics. Microstructure analysis indicates that Ce-doped CCTO ceramics are composed of large and small grains. Our results indicate that only 2.5 at. % Ce doping can suppress the dielectric permittivity in CaCu3Ti4O12 by up to two orders of magnitude (from 104 to 102 ), and the nonlinear varistor characteristics disappear completely, which may be due mainly to the Cu+ ions’ disappearing caused by the Ce doping.
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