Impedance-Spectroscopy Analysis of a LiTaO3-Type Single Crystal

Dong, Ming; Réau, Jean-Maurice; Ravez, J.; Joo, Gi−Tae; Hagenmuller, Pascal

doi:10.1006/jssc.1995.1200

Cited by 94 publications

(22 citation statements)

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“…This influence is quite significant namely at low frequency [18]. The simultaneous existence of maxima in e HH r (w) (latt) when e H r (w) (latt) decreases with log f charaterize a dipolar relaxation occurring in this material.…”

mentioning

confidence: 88%

Structural and Electrical Properties of the NH4DyHP3O10 Compound

Zouari¹,

Khemakhem²,

Gargouri³

et al. 1999

phys. stat. sol. (b)

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Low‐frequency dielectric dispersion phenomena in NH4DyHP3O10 (ammonium dysprosium hydrogen phosphate type) polycrystalline compounds have been analyzed by impedance spectroscopy. The thermal evolution of the dielectric constant shows a phase transition at 305 K which is ferroelectric–paraelectric type. The ferroelectric phase is isotypic with KDyHP3O10triclinic symmetry P1 (at room temperature: a = 6.820 Å, b = 7.583 Å, c = 8.467 Å, α = 104.396°, β = 103.545°, γ = 90.349°, Z = 2). An empirical expression has been deduced for the complex permittivity ε(ω), ε*(ω) = ε∞ + εs ‐ ε∞/1 + (iω/ω1)m + σ0/ε0ω [1 + (iω/ω2)n], where the (ω1, m) and (ω2, n) couples characterize the lattice and the charge carriers responses, respectively. This relation may be considered as a generalisation of the Cole‐Cole dielectric expression. The influence of the charge carrier contribution on the dielectric permittivity at low frequency is significant, as shown when both lattice and carrier polarization mechanisms are simultaneously considered.

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mentioning

confidence: 88%

Structural and Electrical Properties of the NH4DyHP3O10 Compound

Zouari¹,

Khemakhem²,

Gargouri³

et al. 1999

phys. stat. sol. (b)

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“…One of the most convenient ways of checking the polydispersive nature of relaxation time for PFO is to use the Cole-Cole relaxation equation [66,67]. Since the electrical conductivity is dominated as a rapid increase of ε 0 and ε 00 in the low frequency range for PFO, the modified Cole-Cole equation [68,69] is given by…”

Section: Dielectric Constant and Loss Tangent Analysismentioning

confidence: 99%

Dielectric relaxation of PrFeO3 nanoparticles

Saha

Chanda

Dutta

et al. 2016

Solid State Sciences

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“…In semiconductors 12,25 and ionic conductors, [26][27][28][29] free charges and lattice polarizability have contribution to the overall dielectric properties. The usual way to discriminate between these two contributions is to perform impedance spectroscopy (c) Such a straight line becomes a semi-circle when a dielectric relaxation occurs which makes both the capacitance and resistance frequency dependent following Eq.…”

Section: Interplay Between Conductivity and Dielectric Permittivity Imentioning

confidence: 99%

Free charge localization and effective dielectric permittivity in oxides

Maglione

2016

J. Adv. Dielect.

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This review will deal with several types of free charge localization in oxides and their consequences on the effective dielectric spectra of such materials. The first one is the polaronic localization at the unit cell scale on residual impurities in ferroelectric networks. The second one is the collective localization of free charge at macroscopic interfaces like surfaces, electrodes and grain boundaries in ceramics. Polarons have been observed in many oxide perovskites mostly when cations having several stable electronic configurations are present. In manganites, the density of such polarons is so high as to drive a net lattice of interacting polarons. On the other hand, in ferroelectric materials like BaTiO 3 and LiNbO 3 , the density of polarons is usually very small but they can influence strongly the macroscopic conductivity. The contribution of such polarons to the dielectric spectra of ferroelectric materials is described. Even residual impurities as for example Iron can induce well-defined anomalies at very low temperatures. This is mostly resulting from the interaction between localized polarons and the highly polarizable ferroelectric network in which they are embedded. The case of such residual polarons in SrTiO 3 will be described in more detail, emphasizing the quantum polaron state at liquid helium temperatures. Recently, several nonferroelectric oxides have been shown to display giant effective dielectric permittivity. It is first shown that the frequency/temperature behavior of such parameters is very similar in very different compounds (donor-doped BaTiO 3 , CaCu 3 Ti 4 O 12 , LuFe 2 O 4 , Li-doped NiO, etc.). This similarity calls for a common origin of the giant dielectric permittivity in these compounds. A space charge localization at macroscopic interfaces can be the key for such extremely high dielectric permittivity.

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Impedance-Spectroscopy Analysis of a LiTaO3-Type Single Crystal

Cited by 94 publications

References 0 publications

Structural and Electrical Properties of the NH4DyHP3O10 Compound

Structural and Electrical Properties of the NH4DyHP3O10 Compound

Dielectric relaxation of PrFeO3 nanoparticles

Free charge localization and effective dielectric permittivity in oxides

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