Clues to the Giant Dielectric Constant of CaCu3Ti4O12 in the Defect Structure of “SrCu3Ti4O12”

Abstract

The high dielectric constant in “SrCu3Ti4O12” and the giant dielectric constant in CaCu3Ti4O12 are based on a barrier layer mechanism. Conductivity in the conducting regions is related to Ti on Cu sites. The insulating barriers are between crystallites in “SrCu3Ti4O12” but within the crystallites in CaCu3Ti4O12.