Dielectric properties of Gd2CuO4

Shi, Jen–Bin; Hsu, Y. Y.; Lin, Chen-Yi

doi:10.1016/s0921-4534(98)00038-0

Cited by 21 publications

(18 citation statements)

References 13 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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“…2). ranges, which are 1-2 order higher than those reported for the Gd2Cu04 ceramic synthesized by conventional ceramic powder mixing process [6,9]. However, with increasing frequency, at any measured sample temperatures E/ can be seen falling continuously from 10 and finally reaching upto 2"-10 4 , which is still higher in value than those observed for the conventional process.…”

Section: Resultsmentioning

confidence: 55%

“…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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“…The appearance of high ε r ′, as was reported for a few selective T′‐type compositions, has stimulated us to investigate some more members of the T′‐type family, with the aim of enriching the existing dielectric and ac conductivity data. Furthermore, this study should also offer a good possibility of finding a generic feature of high ε r ′ in the layered cuprates.…”

Section: Introductionmentioning

confidence: 93%

Exceptionally High Dielectric Constant in Ceramic Pr₂CuO₄

2013

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The pristine layered cuprate Pr2CuO4 samples of >95% density were fabricated as thin disks. The samples, analyzed by X‐ray diffraction and Scanning electron microscopy, showed clean T′‐type phase with Rietveld refined lattice parameters a = b = 3.95805(±5) Å and c = 12.2262(±5) Å. The measured dielectric properties of the Pr2CuO4 ceramics, in the temperature range −100°C–150°C and frequencies (ν) 0.1 Hz–1 MHz, showed extremely high εr′ > 104 (above −30°C), and dissipation (tan δ = εr′′/εr′) between 0.1 and 5 (for 500 Hz ≤ ν ≤ 1 MHz, and −100 ≤ T ≤ 150°C). The ac conductivity of Pr2CuO4 ceramics ranged between 10−6 and 10−3 Scm−1 for the measured frequencies and temperatures, and showed frequency‐dependent double power law behavior akin to a modified Jonscher's power law.

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Dielectric properties of Gd2CuO4

Cited by 21 publications

References 13 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

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

Exceptionally High Dielectric Constant in Ceramic Pr₂CuO₄

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Dielectric properties of Gd2CuO4

Cited by 21 publications

References 13 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

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

Exceptionally High Dielectric Constant in Ceramic Pr2CuO4

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Exceptionally High Dielectric Constant in Ceramic Pr₂CuO₄