IBLC effect leading to colossal dielectric constant in layered structured Eu2CuO4 ceramic

Salame, Paresh H.; Drai, Renangso; Prakash, Om; Kulkarni, Ajit R.

doi:10.1016/j.ceramint.2013.08.123

Cited by 26 publications

(11 citation statements)

References 37 publications

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“…Recently, anomalously high-dielectric constants (e 0 ) in many polycrystalline and single crystalline ceramic metal oxides have been widely associated with an electrical response of the internal interface(s) in the bulk ceramics [1][2][3][4][5]. CaCu 3 Ti 4 O 12 (CCTO) is a prototypically interesting case study for demonstrating the effects of internal interfaces on apparent macroscopic dielectric properties [1,6].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and Maxwell–Wagner relaxation in Ca 2 Cu 2 Ti 4−x Zr x O 12 : The important clue to achieve the origin of the giant dielectric behavior

Thongbai

Jumpatam

Putasaeng

et al. 2014

Materials Research Bulletin

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Section: Introductionmentioning

confidence: 99%

Microstructural evolution and Maxwell–Wagner relaxation in Ca 2 Cu 2 Ti 4−x Zr x O 12 : The important clue to achieve the origin of the giant dielectric behavior

Thongbai

Jumpatam

Putasaeng

et al. 2014

Materials Research Bulletin

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“…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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“…The values of C g were found between 10 -10 and 10 -11 F, while the C gb values were found to vary between 10 -8 and 10 -9 F. The value of R gb was found to be (C10 4 X) which is only 1-2 orders higher than the grain resistance, R g (B10 3 X). Usually the network of insulating grain boundaries and semiconducting grains could give rise to the internal barrier layer capacitance (IBLC) effect, as observed in many high dielectric and high loss oxide electro-ceramics [24,29,30]. However, in this sample the difference in grain and grain boundary resistance is not that much.…”

Section: Complex Impedance Studies Of 95bfo-5bt Ceramicsmentioning

confidence: 95%

“…This variation of De 00 r /Df with slope of -1 signifies that the dc conductivity ought to be a prime contributor to the dielectric losses in the sample. This conductivity contribution to the dielectric losses in the sample can be represented by [24] e 00…”

Section: Frequency Dependence Of the Dielectric Constant Of 95bfo-5btmentioning

confidence: 99%

Giant dielectric response and magnetoelectric behavior of 95BiFeO3–5BaTiO3 (95BFO–5BT) ceramics

Raut

Salame

Kolte

et al. 2015

J Mater Sci: Mater Electron

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A detailed study of electrical behavior of 95BiFeO 3 -5BaTiO 3 (95BFO-5BT) ceramics through comprehensive analysis of temperature and frequency dependent dielectric behavior, ac impedance and magnetodielectric (MD) properties is reported here. Addition of insulating BaTiO 3 into BiFeO 3 have exhibited enhanced dielectric and ferromagnetic responses. The remnant polarization (P r ) was found to be 6 lC/cm 2 , while the dielectric constant was found to be very high (e 0 r C 10 2 , for T C 140°C). Along with strong conductivity contribution to e 0 r , spectroscopic plots of e 0 r revealed the MaxwellWagner type relaxation in the sample, which ultimately could have led to an apparent high e 0 r in 95BFO-5BT ceramics. Origin of such a high e 0 r in BFO-BT was further investigated using impedance spectroscopy. MD studies revealed the magneto-electric coupling in the ceramics. The MD studies along with anomaly in dielectric data near antiferromagnetic ordering temperature (T N = 170°C) of BFO suggests the magnetic bearing on the electrical properties of 95BFO-5BT ceramics.

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IBLC effect leading to colossal dielectric constant in layered structured Eu2CuO4 ceramic

Cited by 26 publications

References 37 publications

Microstructural evolution and Maxwell–Wagner relaxation in Ca 2 Cu 2 Ti 4−x Zr x O 12 : The important clue to achieve the origin of the giant dielectric behavior

Microstructural evolution and Maxwell–Wagner relaxation in Ca 2 Cu 2 Ti 4−x Zr x O 12 : The important clue to achieve the origin of the giant dielectric behavior

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

Giant dielectric response and magnetoelectric behavior of 95BiFeO3–5BaTiO3 (95BFO–5BT) ceramics

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