Dielectric and impedance spectroscopy study of Ba0.8Bi2.133Nb1.6Ta0.4O9 ferroelectric ceramics, prepared by chemical route

Dhak, Prasanta; Dhak, Debasis; Das, Manasmita; Pramanik, Panchanan

doi:10.1007/s10854-011-0358-1

Cited by 19 publications

(6 citation statements)

References 38 publications

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“…Similar results for this behaviour of the grain boundaries capacitance were found by others authors [2,28]. In the present study, the DC conductivity for grain boundary contribution is calculated using the expression [24] , A…”

Section: Complex Impedance Analysissupporting

confidence: 90%

“…This kind of behaviour suggests that the both ferrites possess a negative temperature coefficient of resistance (NTCR) [16], implying a thermal activated conductivity of these materials. Also, this substantial drop in the R gb provides a clear and unambiguous evidence of grain boundary conduction resulting from reduction in the barrier facilitating thereby mobility of charge carriers with rise in temperature [24]. Further, Fig.…”

Section: Complex Impedance Analysismentioning

confidence: 62%

“…Also, it is evident that the magnitude of Z'' maxima decreases with increase in temperature, indicating increasing loss in the resistive property of prepared samples [23]. Generally, the impedance loss spectra were used to evaluate the relaxation time τ of the electrical phenomena occurring in ferrites using the following relation [24] , π 2…”

Section: Complex Impedance Analysismentioning

confidence: 99%

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Impedance spectroscopy of nanocrystalline MgFe2O4 and MnFe2O4 ferrite ceramics: Effect of grain boundaries on the electrical properties

et al. 2016

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Two ferrite ceramic materials, MgFe 2 O 4 and MnFe 2 O 4 , were successfully fabricated by a conventional sintering of nanosized powders (at 1373 K for 2 h) synthesized by soft mechanochemical route. The particle size and morphology of powders were studied using Xray diffraction (XRD) and transmission electron microscopy (TEM). XRD analysis was carried out for the determination of phase purity, crystal structure and average crystallite size of sintered ferrites. Both mechanosynthesized ferrite samples show mean crystallite sizes in the nm-range. Over the frequency range of 100 Hz to 1 MHz, impedance spectra of prepared ferrite ceramics are investigated at and above room temperature. Changes in the impedance plane plots with temperature have been discussed and correlated to the microstructure of materials. An equivalent circuit model is applied to explore the electrical parameters (resistance and capacitance) associated with grains and grain boundaries. Complex impedance analysis indicates the dominance of grain boundary effects which control the overall electrical behaviour of studied ferrites. The decrease in grain boundary resistance with temperature suggests a thermally activated conduction mechanism.

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Section: Complex Impedance Analysissupporting

confidence: 90%

Section: Complex Impedance Analysismentioning

confidence: 62%

Section: Complex Impedance Analysismentioning

confidence: 99%

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Impedance spectroscopy of nanocrystalline MgFe2O4 and MnFe2O4 ferrite ceramics: Effect of grain boundaries on the electrical properties

et al. 2016

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“…The hopping takes place by charge carriers through localization positions separated by energy barriers of varied heights [38]. The temperature dependent parameter, n represents the extent of many body interactions among charge carriers and defect states [39]. The DC conductivity can be calculated from the fitting of the above equation as shown in insert of Fig.…”

Section: Conductivity Studiesmentioning

confidence: 99%

Investigation of site selectivity of lanthanum in SrBi4Ti4O15 ceramic by structural, dielectric, ferroelectric and conduction behavior

Nayak

Badapanda

Panigrahi

2016

J Mater Sci: Mater Electron

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This manuscript reports the structural and electrical properties of Lanthanum substituted strontium bismuth titanate with general formula SrBi 4-x La x Ti 4 O 15 (where 0 B x B 0.25), prepared by solid-state reaction route. X-ray diffraction study shows a single phase orthorhombic structure in all the compositions. It was also observed that the lattice parameter increases up to x = 0.15 and then decreases with further La content. The Raman spectra shows the distribution of lanthanum into the perovskite layers and (Bi 2 O 2 ) 2? layers of SrBi 4 Ti 4 O 15 ceramic. The temperature dependent dielectric study reveals that the transition temperature and maximum dielectric constant decreases with La content. The broadening of the phase transition was observed with La substitution due to the decrease in octahedral distortion. Impedance analysis confirms the presence of two semicircular arcs in doped samples, suggesting the existence of grain and grain-boundary conduction. The P-E loop study shows that both the remnant polarization (P r ) and the coercive field increases with the increasing La content up to x = 0.15 and thereafter decreases to lower values with further La content. Similar kind of trend is also observed in DC conductivity.

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“…Generally, the relaxor ferroelectrics are characterized by the diffuse phase transition with strong frequency dependence. The dielectric and relaxor behaviour of ferroelectric ceramics could be tailored by the replacement of Bi 3+ ions by suitable trivalent cations [10][11][12][13][14][15]. It was demonstrated that the partial substitution of lanthanum ions in SrBi 2 Nb 2 O 9 ferroelectric ceramics had a profound influence on the Curie temperature and also electrical conductivity which was caused by the presence of oxygen ion vacancies.…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxor and conductivity characteristics of undoped and samarium doped barium bismuth niobate ferroelectric ceramics

Kannan

Venkataraman

2015

Ferroelectrics Letters Section

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Dielectric and impedance spectroscopy study of Ba0.8Bi2.133Nb1.6Ta0.4O9 ferroelectric ceramics, prepared by chemical route

Cited by 19 publications

References 38 publications

Impedance spectroscopy of nanocrystalline MgFe2O4 and MnFe2O4 ferrite ceramics: Effect of grain boundaries on the electrical properties

Impedance spectroscopy of nanocrystalline MgFe2O4 and MnFe2O4 ferrite ceramics: Effect of grain boundaries on the electrical properties

Investigation of site selectivity of lanthanum in SrBi4Ti4O15 ceramic by structural, dielectric, ferroelectric and conduction behavior

Dielectric relaxor and conductivity characteristics of undoped and samarium doped barium bismuth niobate ferroelectric ceramics

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