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1 Materials Science Poland

1 2016

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Synthesis and electrical characterization of Ca2Nd4Ti6O20 ceramics

Muhammad R., Uzair M., Iqbal M. J., Khan M. J., Iqbal Y., Rambo C. R.

Materials Science Poland

2016

Vol. 34, No. 1

164--168

Ca2Nd4Ti6O20, a layered perovskite structured material was synthesized via a chemical (citrate sol-gel) route for the first time using nitrates and alkoxide precursors. Phase analysis of a sample sintered at 1625 degrees C revealed the formation of an orthorhombic (Pbn21) symmetry. The microstructure of the sample after sintering comprised rod-shaped grains of a size of 1.5 to 6.5 μm. The room temperature dielectric constant of the sintered sample was 38 at 100 kHz. The remnant polarization (Pr) and the coercive field (Ec) were about 400 μC/cm2 and 8.4 kV/cm, respectively. Impedance spectroscopy revealed that the capacitance (13.7 pF) and activation energy (1.39 eV) of the grain boundary was greater than the capacitance (5.7 pF) and activation energy (1.13 eV) of the grain.