CaCu3Ti4O12 powders were prepared via EDTA route and single-phase CaCu3Ti4O12 was obtained at 800 degrees 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 degrees C for 3 h exhibited giant dielectric constant of up to 2.1 x 10(5) at room temperature and 100 Hz, which is significantly higher than those obtained from other chemical methods. (C) 2012 Elsevier Ltd. All rights reserved.