| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1490316 | Materials Research Bulletin | 2011 | 6 Pages |
A rare earth double perovskite oxide barium cerium tantalate, Ba2CeTaO6 (BCT) is synthesized by solid-state reaction. The X-ray diffraction pattern of the sample at room temperature (25 °C) shows monoclinic structure, with the lattice parameters, a = 9.78 Å, b = 9.02 Å and c = 4.27 Å and β = 93.8°. A scanning electron micrograph shows the formation of grains with average size ∼ 2 μm. Impedance spectroscopy is applied to investigate the ac electrical properties of BCT in a temperature range from 303 to 673 K and in a frequency range from 100 Hz to 1 MHz. Complex-impedance-plane plots show grain contribution for BCT. The frequency-dependent electrical data are analyzed in the framework of the conductivity and modulus formalisms. The frequency-dependent conductivity spectra follow a power law. The conductivity at 110 Hz varies from 3.5 × 10−7 S m−1 to 1.2 × 10−2 S m−1 with increasing temperature from 303 to 673 K, respectively. The scaling behaviour of M″ and Z″ suggest that the relaxation describes the same mechanism at various temperatures.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A single phase Ba2CeTaO6 (BCT) having monoclinic structure is synthesized. ► Impedance spectroscopy is applied to investigate the ac electrical properties of BCT. ► Complex impedance plane plots show grain contribution for BCT. ► The frequency dependent conductivity spectra follow the power law.
