Synthesis of the giant dielectric constant oxide CaCu3Ti4O12 via ethylenediaminetetraacetic acid precursor

Abstract

CaCu3Ti4O12 powders were prepared via EDTA route and single-phase CaCu3Ti4O12 was obtained at 800°C for 2h. DTA/TG and XRD were used to characterize the precursor and derived oxide powders. The dielectric properties of CaCu3Ti4O12 ceramics were presented. Increasing sintering temperature leads to the increase in dielectric constant. CaCu3Ti4O12 ceramics sintered at 1090°C for 3h exhibited giant dielectric constant of up to 2.1×105 at room temperature and 100Hz, which is significantly higher than those obtained from other chemical methods.