DC conductivity and study of AC electrical conduction mechanisms by non-overlapping small polaron tunneling model in LiFeP2O7 ceramic

Nasri, S.; Megdiche, M.; Gargouri, M.

doi:10.1016/j.ceramint.2015.09.023

Cited by 86 publications

(20 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to understand the conduction mechanism in given material, different theoretical models have been reported by several researchers on the basis of temperature dependence of n value. If the n value is almost independent of temperature that is, ~ 0.8 it is attributed to quantum tunneling model, if the n value decreases with rise in temperature it corresponds to the correlated barrier hopping model, if the n value decreases up to certain value and then increases with rise in temperature it is due to overlapping of long‐range hopping model and if the n value increases with rise in temperature, it is attributed to small polaron tunneling model …”

Section: Resultsmentioning

confidence: 99%

“…If the n value is almost independent of temperature that is,~0.8 it is attributed to quantum tunneling model, if the n value decreases with rise in temperature it corresponds to the correlated barrier hopping model, if the n value decreases up to certain value and then increases with rise in temperature it is due to overlapping of long-range hopping model and if the n value increases with rise in temperature, it is attributed to small polaron tunneling model. 55,56 The experimental r ac data were fitted to JPL equation by taking r dc , A and n as free parameters. The fitted data are shown as solid lines in Figure 10A-E.…”

Section: Ac Conductivitymentioning

confidence: 99%

See 1 more Smart Citation

Structural, magnetic and dielectric properties of Cr substituted yttrium iron garnets

Aakansha

Ravi

2018

J Am Ceram Soc

View full text Add to dashboard Cite

Chromium substituted polycrystalline Yttrium Iron Garnets (Y3Fe5–xCrxO12 with x = 0 to 0.5) were prepared in single‐phase form with lattice constant in the range of 12.3775 Å to 12.3560 Å. All samples exhibit ferrimagnetic transition with transition temperature (Tc) in the range of 547 K for x = 0 to 494 K for x = 0.5. The saturation magnetization value at room temperature is found to increase with Cr concentration that is, from 24.8 to 26.6 emu/g and this is attributed to the preferential occupation of Cr3+ ions at octahedral site of Fe3+ ions. The frequency dependence of impedance data shows the relaxation and thermal activation of charge carriers across grains and grain boundaries. The complex impedance spectra were modeled by considering equivalent circuits having contributions from the resistance and constant phase element due to grains and grain boundaries and capacitance across grain boundaries. The dielectric constant is found to increase from 20 to 52 as the Cr concentration is increased and it is attributed to hopping of charge carriers across Fe2+–Fe3+ centers. The Arrhenius plots of relaxation time of charge carriers and conductivity show an anomaly in the vicinity of ferrimagnetic transition temperature and it highlights the presence of magneto‐electric coupling.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Ac Conductivitymentioning

confidence: 99%

Structural, magnetic and dielectric properties of Cr substituted yttrium iron garnets

Aakansha

Ravi

2018

J Am Ceram Soc

View full text Add to dashboard Cite

show abstract

“…The spectra band appears at 764 cm -1 which is attributed to stretching modes of P-O-P bridges. The width and intense modes observed in 949 cm -1 are due to the normal vibration of the bridging oxygen atom with alkali ion [14]. Moreover, the asymmetric stretching vibration of PO 3 appears in 1126 cm -1 , with the highest intensity detected in LFP-1 and also found in LFP-2.…”

Section: Figure 3 the Ftir Spectra Of Lfp/c Samplementioning

confidence: 89%

Synthesis and Characterization of Lithium Iron Phosphate Carbon Composite (LFP/C) using Magnetite Sand Fe3O4

Anisa¹,

Zainuri²

2020

J. Pure App. Chem Res

View full text Add to dashboard Cite

Lithium Ferro Phosphate Carbon Composite (LFP/C) had been synthesized using solid-state reaction method. Magnetite sand Fe3O4 was used as Fe- source in LFP/C synthesized. Calcination temperature of the sample performed at 400, 500, and 600°C. The phase and composition of samples determined by Rietveld analysis of X-ray diffraction (XRD) pattern. The dominant identified phase at 400°C was diphosphate LiFeP2O7, and the others phases were nasicon Li3Fe2(PO4)3 and hematite Fe2O3. As the temperature getting higher the diphosphate phase LiFeP2O7 transform to nasicon Li3Fe2(PO4)3.The chemical bonds, lattice vibration and other structural features of the sample were investigated using FTIR spectroscopy in range of 1400 – 400 cm-1. Specific vibration modes in LFP-1 to LFP-3 for each bonding were shown by the high intense in certain wavenumber.

show abstract

“…The appropriate model for characterizing the electrical conduction in this region is the small polar tuning (NSPT) without overlap. 78 The power law is determined from Jonscher's equation using the Almond-West expression: 79…”

Section: Uv-visible Absorption Studymentioning

confidence: 99%

Structural, optical and dielectric properties of Cu_1.5Mn_1.5O₄ spinel nanoparticles

et al. 2020

View full text Add to dashboard Cite

show abstract

DC conductivity and study of AC electrical conduction mechanisms by non-overlapping small polaron tunneling model in LiFeP2O7 ceramic

Cited by 86 publications

References 24 publications

Structural, magnetic and dielectric properties of Cr substituted yttrium iron garnets

Structural, magnetic and dielectric properties of Cr substituted yttrium iron garnets

Synthesis and Characterization of Lithium Iron Phosphate Carbon Composite (LFP/C) using Magnetite Sand Fe3O4

Structural, optical and dielectric properties of Cu_1.5Mn_1.5O₄ spinel nanoparticles

Contact Info

Product

Resources

About

DC conductivity and study of AC electrical conduction mechanisms by non-overlapping small polaron tunneling model in LiFeP2O7 ceramic

Cited by 86 publications

References 24 publications

Structural, magnetic and dielectric properties of Cr substituted yttrium iron garnets

Structural, magnetic and dielectric properties of Cr substituted yttrium iron garnets

Synthesis and Characterization of Lithium Iron Phosphate Carbon Composite (LFP/C) using Magnetite Sand Fe3O4

Structural, optical and dielectric properties of Cu1.5Mn1.5O4 spinel nanoparticles

Contact Info

Product

Resources

About

Structural, optical and dielectric properties of Cu_1.5Mn_1.5O₄ spinel nanoparticles