This paper shows that CaCu_3Ti_4O_{12} (CCTO) can be synthesized through the high-energy ball milling of CaO, CuO and TiO_2 powders. The dielectric characterization of CCTO obtained mechanochemically as well as, for comparison, by a high-temperature method is presented. Moreover, it is illustrated that zirconium oxide in contrast to a metallic iron generated during milling processes improves the properties of CCTO in terms of ceramic capacitors.