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 we...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.展开更多
Ceramic samples of Barium Zirconium Titanate(BaZr_(x)Ti_(1-x)O_(3)(BZT))were synthesized by conventional solid-state reaction method with different concentrations of x(=0.05(BZT1),0.10(BZT2),0.15(BZT3),0.20(BZT4),0.25...Ceramic samples of Barium Zirconium Titanate(BaZr_(x)Ti_(1-x)O_(3)(BZT))were synthesized by conventional solid-state reaction method with different concentrations of x(=0.05(BZT1),0.10(BZT2),0.15(BZT3),0.20(BZT4),0.25(BZT5),0.30(BZT6)).Phase confirmation of the samples was done by X-ray diffraction(XRD)technique.All the compositions are in cubic structure.XRD pattern was recorded for samples sintered at different sintering temperatures.Lattice parameters increased with addition of Zr^(+4).Doping with Zr^(+4)into Barium titanate resulted in interesting changes of electrical properties(dielectric,impedance and ferroelectiricity).The strong influence of Zr doping on the phase transition characteristics of the BZT ceramics was studied from the dielectric response of the samples.Diffusivity of phase transition of the BZT ceramic samples increase with Zr^(+4)concentration,indicating changes from normal to diffuse transition to relaxor phase transition behavior.Impedance spectroscopy reveals the presence of temperature-dependent grain,grain boundary effects.Polarization-Electricfield(PE)loop measurements are also done on the samples.展开更多
文摘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.
基金the University Grants CommissionNew Delhi,India for providing the financial assistance under the sponsored project.
文摘Ceramic samples of Barium Zirconium Titanate(BaZr_(x)Ti_(1-x)O_(3)(BZT))were synthesized by conventional solid-state reaction method with different concentrations of x(=0.05(BZT1),0.10(BZT2),0.15(BZT3),0.20(BZT4),0.25(BZT5),0.30(BZT6)).Phase confirmation of the samples was done by X-ray diffraction(XRD)technique.All the compositions are in cubic structure.XRD pattern was recorded for samples sintered at different sintering temperatures.Lattice parameters increased with addition of Zr^(+4).Doping with Zr^(+4)into Barium titanate resulted in interesting changes of electrical properties(dielectric,impedance and ferroelectiricity).The strong influence of Zr doping on the phase transition characteristics of the BZT ceramics was studied from the dielectric response of the samples.Diffusivity of phase transition of the BZT ceramic samples increase with Zr^(+4)concentration,indicating changes from normal to diffuse transition to relaxor phase transition behavior.Impedance spectroscopy reveals the presence of temperature-dependent grain,grain boundary effects.Polarization-Electricfield(PE)loop measurements are also done on the samples.
