Dielectric relaxation and magnetic field dependent alternating current conductivity of nanocrystalline cadmiumzinc ferrite below room temperature

S. Ghatak; G. Chakraborty; M. Sinha; S. K. Pradhan; A. K. Meikap

doi:10.1016/j.physb.2011.05.036

Dielectric relaxation and magnetic field dependent alternating current conductivity of nanocrystalline cadmiumzinc ferrite below room temperature

S. Ghatak, G. Chakraborty, M. Sinha, S. K. Pradhan, A. K. Meikap

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

The dielectric permittivity of nanocrystalline cadmiumzinc ferrite prepared by the ball milling method has been investigated within a temperature range 77≤T≤300 K in presence of a magnetic field up to 1 T and in the frequency range 20 Hz1 MHz. The dielectric permittivity follows the power law ε^/(f)∝Tⁿ where the temperature exponent 'n' is found to be frequency dependent. The dielectric properties of the samples have been analyzed in terms of electric modulus vector. The dielectric relaxation has been explained by interfacial polarization. The variation of the relaxation time with temperature indicates the presence of two different activation energies. The ac magnetoconductivity is positive for the milled sample and becomes negative for the unmilled sample. This behavior can be explained in terms of grain and grain boundary contribution to impedance of the samples.

Original language	English
Pages (from-to)	3261-3266
Number of pages	6
Journal	Physica B: Condensed Matter
Volume	406
Issue number	17
DOIs	https://doi.org/10.1016/j.physb.2011.05.036
State	Published - 1 Sep 2011
Externally published	Yes

Keywords

Dielectric Properties
Interfacial Polarization
Nanostructures
X-ray diffraction

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10.1016/j.physb.2011.05.036

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title = "Dielectric relaxation and magnetic field dependent alternating current conductivity of nanocrystalline cadmiumzinc ferrite below room temperature",

abstract = "The dielectric permittivity of nanocrystalline cadmiumzinc ferrite prepared by the ball milling method has been investigated within a temperature range 77≤T≤300 K in presence of a magnetic field up to 1 T and in the frequency range 20 Hz1 MHz. The dielectric permittivity follows the power law ε/(f)∝Tn where the temperature exponent 'n' is found to be frequency dependent. The dielectric properties of the samples have been analyzed in terms of electric modulus vector. The dielectric relaxation has been explained by interfacial polarization. The variation of the relaxation time with temperature indicates the presence of two different activation energies. The ac magnetoconductivity is positive for the milled sample and becomes negative for the unmilled sample. This behavior can be explained in terms of grain and grain boundary contribution to impedance of the samples.",

keywords = "Dielectric Properties, Interfacial Polarization, Nanostructures, X-ray diffraction",

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T1 - Dielectric relaxation and magnetic field dependent alternating current conductivity of nanocrystalline cadmiumzinc ferrite below room temperature

AU - Ghatak, S.

AU - Chakraborty, G.

AU - Sinha, M.

AU - Pradhan, S. K.

AU - Meikap, A. K.

PY - 2011/9/1

Y1 - 2011/9/1

N2 - The dielectric permittivity of nanocrystalline cadmiumzinc ferrite prepared by the ball milling method has been investigated within a temperature range 77≤T≤300 K in presence of a magnetic field up to 1 T and in the frequency range 20 Hz1 MHz. The dielectric permittivity follows the power law ε/(f)∝Tn where the temperature exponent 'n' is found to be frequency dependent. The dielectric properties of the samples have been analyzed in terms of electric modulus vector. The dielectric relaxation has been explained by interfacial polarization. The variation of the relaxation time with temperature indicates the presence of two different activation energies. The ac magnetoconductivity is positive for the milled sample and becomes negative for the unmilled sample. This behavior can be explained in terms of grain and grain boundary contribution to impedance of the samples.

AB - The dielectric permittivity of nanocrystalline cadmiumzinc ferrite prepared by the ball milling method has been investigated within a temperature range 77≤T≤300 K in presence of a magnetic field up to 1 T and in the frequency range 20 Hz1 MHz. The dielectric permittivity follows the power law ε/(f)∝Tn where the temperature exponent 'n' is found to be frequency dependent. The dielectric properties of the samples have been analyzed in terms of electric modulus vector. The dielectric relaxation has been explained by interfacial polarization. The variation of the relaxation time with temperature indicates the presence of two different activation energies. The ac magnetoconductivity is positive for the milled sample and becomes negative for the unmilled sample. This behavior can be explained in terms of grain and grain boundary contribution to impedance of the samples.

KW - Dielectric Properties

KW - Interfacial Polarization

KW - Nanostructures

KW - X-ray diffraction

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IS - 17

ER -

Dielectric relaxation and magnetic field dependent alternating current conductivity of nanocrystalline cadmiumzinc ferrite below room temperature

Abstract

Keywords

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