New perovskite oxides of the type (Ln1/3Ba1/3Ca1/3)(Zn1/3Ti2/3)O3−δ: Rietveld analysis and dielectric properties

Pure phases were obtained for the oxides (Ln1/3Ba1/3Ca1/3)(Zn1/3Ti2/3)O3−δ in case of Ln = La, Pr and Nd. These oxides crystallized in a cubic structure as observed from Rietveld refinement of powder X-ray diffraction studies and do not show any ordering of the cations. All the three compounds exhibit highly stable dielectric properties with respect to frequency (in the range 50–500 kHz) and temperature (35–300 °C). The dielectric constant depends on the size of the cations and varies from 81 for the La-based oxide to 70 for the Nd-based oxides. The dielectric loss is in the range of 0.003–0.004 for all the three oxides at 100 kHz.