Ionic conductivity and dielectric relaxation in Y doped La2Mo2O9 oxide-ion conductors

Paul, Thierry; Ghosh, A.

doi:10.1063/1.4897456

Cited by 20 publications

(11 citation statements)

References 22 publications

(24 reference statements)

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“…The analysis of dielectric spectra is also important to get insights into relaxation phenomena in case of polymers, glasses, oxide ion conductors, etc. [20][21][22] In the present work, we have studied ionic conductivity and dielectric relaxation of PEOLiClO 4 solid polymer electrolyte plasticized with propylene carbonate (PC). To illustrate the ion transport mechanism, ion-ion interactions have been also studied using Raman spectra.…”

Section: Introductionmentioning

confidence: 99%

Ionic conductivity and dielectric permittivity of PEO-LiClO4 solid polymer electrolyte plasticized with propylene carbonate

Das

Ghosh

2015

AIP Advances

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We have studied ionic conductivity and dielectric permittivity of PEO-LiClO4 solid polymer electrolyte plasticized with propylene carbonate. Differential scanning calorimetry and X-ray diffraction studies confirm minimum volume fraction of crystalline phase for the polymer electrolyte with 40 wt. % propylene carbonate. The ionic conductivity exhibits a maximum for the same composition. The temperature dependence of the ionic conductivity has been well interpreted using Vogel-Tamman-Fulcher equation. Ion-ion interactions in the polymer electrolytes have been studied using Raman spectra and the concentrations of free ions, ion-pairs and ion-aggregates have been determined. The ionic conductivity increases due to the increase of free ions with the increase of propylene carbonate content. But for higher content of propylene carbonate, the ionic conductivity decreases due to the increase of concentrations of ion-pairs and ion-aggregates. To get further insights into the ion dynamics, the experimental data for the complex dielectric permittivity have been studied using Havriliak–Negami function. The variation of relaxation time with temperature obtained from this formalism follows Vogel-Tamman-Fulcher equation similar to the ionic conductivity.

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Section: Introductionmentioning

confidence: 99%

Ionic conductivity and dielectric permittivity of PEO-LiClO4 solid polymer electrolyte plasticized with propylene carbonate

Das

Ghosh

2015

AIP Advances

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“…"t" is an exponent (0 < t 1), which indicates the ohmic behavior. 37,38 The closer the "t" value approaches unit, the more ideal the ohmic behavior is. At low frequency, the parameter "r" can be replaced by the dc conductivity (r dc ).…”

Section: Resultsmentioning

confidence: 99%

Studies on the microwave permittivity and electromagnetic wave absorption properties of Fe-based nano-composite flakes in different sizes

Han

Liu

Deng

2015

Journal of Applied Physics

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The effective permittivity of composites containing Fe-Cu-Nb-Si-B nanocrystalline micro flakes has been studied within 0.5–10 GHz. Obvious differences in microwave permittivity have been observed for composites consisting of large flakes (size range: 23–111 μm, average thickness: 4.5 μm) and small flakes (size range: 3–21 μm, average thickness: 1.3 μm). Both the real part and imaginary part of permittivity of large flake composite are much larger than these small one in a given frequency. And faster decrease of permittivity with the increasing frequency can be observed for large flake composite than that of small one. These differences in permittivity spectra of different flakes have been explained from the perspective of interfacial polarization and ac conductivity. The assumption that more extensive ohmic contact interface between large flakes and matrix has been validated by the fittings and the calculated percolation threshold. Meanwhile, the permeability spectra of both composites also have been studied by Lorentzian dispersion law. The broadened spectra can be attributed to the distribution of magnetic anisotropy fields of two kinds of ferromagnetic phases in the particles. Finally, the composite containing the small flakes exhibits better electromagnetic wave absorption properties.

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“…14 The electrical conductivity and dielectric properties of the polycrystalline samples of La 2Àx Y x Mo 2 O 9 have been reported by the present authors. 15 Both the bulk and grain boundary conductivities are found to follow the Arrhenius nature at low temperatures. 15 Additionally, the two dielectric relaxation peaks are found arising from the diffusion of oxide ions via vacancies.…”

Section: Introductionmentioning

confidence: 96%

“…15 Both the bulk and grain boundary conductivities are found to follow the Arrhenius nature at low temperatures. 15 Additionally, the two dielectric relaxation peaks are found arising from the diffusion of oxide ions via vacancies. 15 Fourier transform infrared and Raman spectra of La 2 Mo 2 O 9 are also presented elsewhere.…”

Section: Introductionmentioning

confidence: 96%

“…15 Additionally, the two dielectric relaxation peaks are found arising from the diffusion of oxide ions via vacancies. 15 Fourier transform infrared and Raman spectra of La 2 Mo 2 O 9 are also presented elsewhere. 16 In this present work, we have investigated the effect of Y substitution on La site for La 2 Mo 2 O 9 on the structure and ion conduction properties.…”

Section: Introductionmentioning

confidence: 99%

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Correlation of structure and ion conduction in La2−xYxMo2O9 (0 ≤ x ≤ 0.2) oxygen ion conductors

Paul

Ghosh

2015

Journal of Applied Physics

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Articles you may be interested inSpontaneous formation of circular and vortex ferroelectric domain structure in hexagonal YMnO3 and YMn0.9Fe0.1O3 prepared by low temperature solution synthesisCorrelation of structure and ion conduction of La 2Àx Y x Mo 2 O 9 (0 x 0.2) has been investigated. The cubic symmetry with space group P2 1 3 and other structural parameters are obtained from Rietveld refinement of X-ray diffraction patterns of Y doped samples. The average lanthanum-oxygen and molybdenum-oxygen distances are obtained from the electron density contour plot. The transmission electron microscopic study confirms the cubic nature of the samples and also provides an estimate of thickness of the grain boundary. The scanning transmission electron microscope energy dispersive spectrometer mapping confirms the different orientations of grains. The composition dependence of the ionic conductivity has been correlated with that of O2 and O3 site occupancies in the [O1La 3 Mo] antitetrahedral unit. The different vibrational modes in the low frequency region due to vibration of Mo-O bands are confirmed from the analysis of FTIR and Raman spectra. The full widths at half maximum of most of the Mo-O bands are found to be independent of Y doping. Additionally, the shifts in the position of Raman bands are correlated with unit cell parameter using Gr€ uneisen constant. V C 2015 AIP Publishing LLC.

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Ionic conductivity and dielectric relaxation in Y doped La2Mo2O9 oxide-ion conductors

Cited by 20 publications

References 22 publications

Ionic conductivity and dielectric permittivity of PEO-LiClO4 solid polymer electrolyte plasticized with propylene carbonate

Ionic conductivity and dielectric permittivity of PEO-LiClO4 solid polymer electrolyte plasticized with propylene carbonate

Studies on the microwave permittivity and electromagnetic wave absorption properties of Fe-based nano-composite flakes in different sizes

Correlation of structure and ion conduction in La2−xYxMo2O9 (0 ≤ x ≤ 0.2) oxygen ion conductors

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