Dielectric relaxation in a nonferroelectric phase of magneto-electric multiferroic CuFeO2

Mitsuda, Setsuo; Yamano, Motoyoshi; Kuribara, Koichi; Nakajima, Tsuyoshi; Masuda, Kazunori; Yoshitomi, Keisuke; Terada, Noriki; Kitazawa, Hideaki; Takenaka, K.; Takamasu, T.

doi:10.1088/1742-6596/200/1/012120

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…This means the dielectric dynamics of milled samples, where two spinel phases are coexisting in each other, are drastically different from the samples where Co atoms are being incorporated in the spinel lattices of Fe 3(1-x) Co 3x O 4 composition. The mechanism of electrical conduction and multiferroelectricity in the present materials may be controlled by many factors in spinel lattices, e.g., site exchange among A and B sites cations, exchange of electrons among B site cations (Fe 2+ ↔ Fe 3+ , Co 3+ ↔ Co 2+ ), interfacial interaction between grain and grain boundary spin, structural disorder at the interfaces (grain boundaries) of grains and grain size effects, effects of magnetic domain and magnetic disorder (Gopalan et al, 2008;Meena et al, 2009;Mitsuda et al, 2010;Heikes et al, 1957). It is believed that at lower frequency region the grain boundaries are more active and hopping between ions Fe 3+ and Fe 2+ is less.…”

Section: Ac Conductivity At Room Temperaturementioning

confidence: 99%

Structure, ac conductivity and complex impedance study of Co3O4 and Fe3O4 mixed spinel ferrites

Bhowmik¹,

Naresh²

2011

Int. J. Eng. Sci. Tech

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We have synthesized the composition of Fe 3(1-x) Co 3x O 4 (x =0.1, 0.3 and 0.5) spinel ferrite using the techniques of mechanical alloying, high temperature annealing of milled samples and conventional solid state sintering. We present here comparative results of the crystal structure formation and dielectric properties of the materials studied at room temperature. The crystalline structure of the single phased samples is cubic spinel phase with space group Fd3m. The alloying of two spinel oxides (i.e., Fe 3 O 4 and Fe 3 O 4) is also complemented from FTIR spectrum. Impedance spectroscopy suggested only one semi circle in the Cole-Cole plot of mechanical milled samples, which indicated the dominant grain boundary contribution in the conduction mechanism. In addition to the grain boundary contribution, the electrical conduction from grains is also substantial in the single phased compositions of the present material. The present results could be interesting in tailoring the electrical conductivity in magnetic nanocomposite.

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Section: Ac Conductivity At Room Temperaturementioning

confidence: 99%

Structure, ac conductivity and complex impedance study of Co3O4 and Fe3O4 mixed spinel ferrites

Bhowmik¹,

Naresh²

2011

Int. J. Eng. Sci. Tech

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Origin of Magnetic Dielectric Effect in Geometry Frustrated CuFe1−xMnxO2 Single Crystal

Xiao

Xia

et al. 2022

J Supercond Nov Magn

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Colossal dielectric permittivity and mechanism of AC conduction in bulk delafossite CuFeO2

Pokhriyal

Bhakar

Sinha

et al. 2019

Journal of Applied Physics

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We report structural, dielectric, and ac conductivity studies of CuFeO2, a material that belongs to the delafossite family. X-ray diffraction, X-ray absorption near edge structure (XANES), and impedance studies were carried out in order to investigate the structural and dielectric properties of the system. XANES measurement suggests that Fe present in the sample is in a mixed valence state. Dielectric properties measured at a temperature range of 84–450 K exhibit colossal dielectric permittivity with clearly distinguishable grain and grain boundary contributions. It has been found that both short-range and long-range motions of charge carriers are present in the sample, with the short-range motion dominating at low temperatures and long-range motion dominating at high temperatures. It has also been observed that the conduction in the sample is dominated by the conduction through the grain boundaries.

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Dielectric relaxation in a nonferroelectric phase of magneto-electric multiferroic CuFeO₂

Cited by 4 publications

References 15 publications

Structure, ac conductivity and complex impedance study of Co<sub>3</sub>O<sub>4</sub> and Fe<sub>3</sub>O<sub>4</sub> mixed spinel ferrites

Structure, ac conductivity and complex impedance study of Co<sub>3</sub>O<sub>4</sub> and Fe<sub>3</sub>O<sub>4</sub> mixed spinel ferrites

Origin of Magnetic Dielectric Effect in Geometry Frustrated CuFe1−xMnxO2 Single Crystal

Colossal dielectric permittivity and mechanism of AC conduction in bulk delafossite CuFeO2

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