CaCu 3 Ti 4 O 12 ceramic via oxalate route: Synthesis, characterization and electrical properties

In this manuscript, a new method for the synthesis of CaCu 3 Ti 4 O 12 (CCTO) perovskite was adopted via coprecipitation followed by calcination processes. The co-precipitation route was employed to synthesize calcium and copper oxalates precipitated on the TiO 2 surfaces and the calcination technique at different temperatures was utilized to follow the single-phase formation. Differential thermal analysis-thermogravimetry (DTATG) were used to estimate the proper calcination temperatures and to follow the precursor ' s decomposition stages. X-ray diffraction (XRD) revealed the initiation of titanate formation at 700 degrees C. The complete formation of single-phase was achieved at 1100 degrees C. In agreement with the XRD measurements, FT-IR spectra confirmed the formation the different phases at different calcination temperatures. The prepared titanate showed giant dielectric properties with values higher than reported in literature. The conductivity measurement indicated semi-conducting properties and revealed a transition agreed well with that obtained in the dielectric properties measurements vs. temperature, attributed to the orientional polarization or change in the entire conduction mechanism from hopping to ionic conduction. The obtained electrical properties enhances the utilization of the entire titanate as capacitors.