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Structural and dielectric properties of zinc cobalt oxide ( ZnCo 2 O 4 ) ceramics AIP Conf.Enhanced piezoelectric properties of lead zirconate titanate sol-gel derived ceramics using single crystal PbZr 0.52 Ti 0.48 O 3 cubes Abstract. This paper reports the dielectric properties of the Mn doped CaCu 3 Ti 4 O 12 (CCTO) ceramics synthesized by the conventional solid-state reaction method. By partial Mn for Ti substitution, the dielectric loss was suppressed significantly while the dielectric constant (H r ) still remained high. The compound CaCu 3 Ti 3.76 Mn 0.24 O 12 exhibits a high H r (>1200) and a low dielectric loss (<0.06 at room temperature). Furthermore, the H r value of this material is reasonably independent of temperature. SEM micrographs show no impurity in the Mn doped CCTO ceramics, which exhibit dense microstructures without abnormal grains. This CaCu 3 Ti 4-x Mn x O 12 system appears to be a promising candidate for capacitor applications.