Study of dielectric relaxation behavior in Nd2CuO4

Chen, J.W.; Wang, J.C.; Chen, Y.F.

doi:10.1016/s0921-4534(97)01577-3

Cited by 41 publications

(19 citation statements)

References 28 publications

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“…This reduction of jumping probability may be ascribed to the decrease of iron ion in the B-site, which is responsible for the polarization in this ferrite. A similar behavior was observed in zinc-substituted magnesium-rich manganese ferrite [25], Nd-Cu ferrite [26], Gd-Cu ferrite [27], Ni-Zn ferrite [22] and also in Cu-Zn ferrite [28].…”

Section: Dielectric Loss Tangent Behaviorsupporting

confidence: 79%

AC conductivity and frequency dependence of the dielectric properties for copper doped magnetite

Zaki

2005

Physica B: Condensed Matter

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Section: Dielectric Loss Tangent Behaviorsupporting

confidence: 79%

AC conductivity and frequency dependence of the dielectric properties for copper doped magnetite

Zaki

2005

Physica B: Condensed Matter

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“…Further, this corresponding peak in tan δ can be seen shifting towards higher frequencies with increasing temperature, indicating Debye type thermally activated mechanism. 34 According to this mechanism whenever the hopping frequency of charge carriers matches with the applied frequency, a peak in tan δ is observed. This conductivity contribution due to hopping of charge carriers is evident from Figure 3 35,36 and is given by the equation (1); where, σ dc is conductivity at the lowest measured frequency, ε 0 (8.85 × 10 −12 Fm −1 ) is the permittivity of the free space and ω (angular frequency) = 2πν.…”

Section: Resultsmentioning

confidence: 98%

“…However, there have a lot of reports on the applicability of internal barrier layer capacitance (IBLC) effect in few of the oxide ceramics which have shown exceptionally high ε r ′ albeit showing high loss. 17,18,21,34,[49][50][51][52][53] This IBLC effect arises predominantly due to the heterogeneity in the electrical microstructure of the ceramics. Impedance spectroscopy is a useful tool to study the electrical heterogeneity of the sample, which can be done by deciphering the contribution of the grain and grain boundaries.…”

Section: Resultsmentioning

confidence: 99%

Impedance and AC conductivity study of nano crystalline, fine grained multiferroic bismuth ferrite (BiFeO3), synthesized by microwave sintering

Kolte

Salame²,

Daryapurkar

et al. 2015

AIP Advances

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In this paper, major reduction in sintering time,temperautre and significant improvement over final density of sitnered sample is reported for the microwave sintered nanocrystalline BiFeO 3 (BFO) ceramic. Also, different sintering time and temperatures have been used to tailor the grain size and the final density of the resulting BFO ceramics synthesized from phase pure BFO nanoparticles (d ≈ 10 nm). Microwave sintering resulted in reducing the sintering time substantially (by 1h), and has resulted in submicron sized grains and high resistivity ∼ 1.8 GΩ-cm. The AC conductivity is seen to follow the Jonscher's power law behavior, suggesting correlated barrier hopping (CBH) mechanism in the sample. The role of oxygen vacancies at high temperature, due to volatility of bismuth, in dielectric and conductivity behavior is also discussed. Further, the sample displayed dielectric anomaly near magnetic transition temperature (∼180 • C) indicating bearing of magnetic moments on the dielectric properties. Using Impedance Spectroscopy (IS) we have established, the electrical heterogeneity of the ceramic BFO reavealing semiconducting nature of grains and insulating nature of grain boundary. This, formation of network of insulating grain boundaries and semiconducting grains could lead to formation of internal barrier layer capacitance (IBLC) leading to high dielectric constant in microwave sintered BFO. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx.

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“…Apart from the above NFE high dielectric constant materials, in the recent past, a few of the pristine layered cuprates viz. La2Cu04 and Nd2Cu04 with T-and T' type structures respectively [4], have also been reported to have extremely high £/ values (> 10 3 ,/:s IMHz) [5][6]. Thus, the family of pristine cuprates, per se present an interesting prospect, which could also be used to exploit their microstructure dependence on the dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanocrystalline giant dielectric constant Gd<inf>2</inf>CuO<inf>4</inf> ceramic by Pechini process

Salame

Drai

Prakash

et al. 2013

International Conference on Advanced Nanomaterials &Amp; Emerging Engineering Technologies

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Phase pure (T'-type, sp. gpo I4/mmm), category of materials to be explored fully for their dielectric nanocrystalline Gd2Cu04 powders were synthesized by a wetproperties. However, the observed high £/ was contested to be chemical citrate gel complexation process known as "Pechini process". The T'-type phase was realized at much lower (_ 1073 mostly intrinsic in nature and extrinsic factors affecting £/ K) temperature than those reported for conventional ceramic were not studied. Further, these few select compounds studied powder mixing and solid state reaction process (_ 1223 K). The so far were synthesized using standard ceramic powder average particle size of the solid state reacted particles from HRmixing and solid state reaction process, which requires high TEM was found to be -50 nm. The dielectric studies on the synthesis temperatures and often encountered with Gd2Cu04 pellets revealed extremely high values of E/ (�10 4 ) inhomogeneity of constituent ions. In contrast, wet chemical over the measure frequencies (1 <5. f <5. 1 MHz) and temperature synthesis process facilitates the molecular level mixing of (173 K <5. T<5. 423 K) ranges. Being non-ferroelectric, we propose constituent elements, which in turn contribute towards such high values of E/ arise due to an Internal barrier layer maintaining better stoichiometry and lower synthesis capacitance effect, formed by insulating grain boundaries and semiconducting grains in the ceramics. temperatures [7]. However, there have been a very few reports

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Study of dielectric relaxation behavior in Nd2CuO4

Cited by 41 publications

References 28 publications

AC conductivity and frequency dependence of the dielectric properties for copper doped magnetite

AC conductivity and frequency dependence of the dielectric properties for copper doped magnetite

Impedance and AC conductivity study of nano crystalline, fine grained multiferroic bismuth ferrite (BiFeO3), synthesized by microwave sintering

Synthesis of nanocrystalline giant dielectric constant Gd<inf>2</inf>CuO<inf>4</inf> ceramic by Pechini process

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