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

CaCu3Ti4O12 powders were prepared via EDTA route and single-phase CaCu3Ti4O12 was obtained at 800 °C for 2 h. 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 3 h exhibited giant dielectric constant of up to 2.1 × 105 at room temperature and 100 Hz, which is significantly higher than those obtained from other chemical methods.

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► CaCu3Ti4O12 powders and ceramics were synthesized via EDTA route.
► Phase pure CaCu3Ti4O12 powders were obtained at 800 °C for 2 h.
► CaCu3Ti4O12 ceramics exhibited giant dielectric constant of up to 2.1 × 105.