摘要
Ceramic samples of composition Ba_(1-3)xNd_(2x)Ti_(1-y)ZryO_(3)(x=0.025;y=0.025 and 0.05)were synthesized by modified sol-gel technique.Phase confirmation,surface morphology and electrical properties of the samples were studied using XRD,FESEM,impedance spectroscopy and DC conductivity.Impedance,AC and DC conductivities of the samples were recorded in the temperature range room temperature(RT)-500℃.From impedance data,various parameters like bulk resistance(R_(b)),bulk capacitance(C_(b)),grain resistance(R_(g)),grain boundary resistance(R_(gb)),grain capacitance(C_(g))and grain boundary capacitance(Cgb)T were determined.These parameters were found to be function of both temperature and frequency.Grain and grain boundary relaxation times(τ_(g),τ_(gb))were also evaluated as a function of temperature.From AC and DC conductivity plots activation energies for conduction were obtained.Results obtained lead to improved understanding of conductivity and charge transportation kinetics in the present system of samples.
