Abstract
The capacitance–dc voltage relation has been investigated in the giant dielectric constant material CaCu3Ti4O12. A capacitance drop, rise and even maxima, minima have been found with increasing dc voltage, which could not simply be explained by the back-to-back Schottky barrier theory. A trap charges repositioning between field perpendicular boundaries and field parallel boundaries has been put forward to explain the strange C-V relations. In addition, a first order calculation of C-V has been done based on the charge repositioning model and has led to a successful fitting of the experimental curves, extracting parameters such as a polarisability of about 1.5×10−39 for the induced dipoles.
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