Dielectric relaxation and conduction mechanism of cobalt ferrite nanoparticles

Panda, Ranjit Kumar; Muduli, Rakesh; Kar, Subrat Kumar; Behera, D.

doi:10.1016/j.jallcom.2014.07.031

Cited by 129 publications

(44 citation statements)

References 51 publications

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“…13a, b. In the low frequency, it was found that, frequency exponent 'n' decrease with increase in temperature which agrees with correlated barrier hopping model [41]. According to this model,…”

Section: Ac Conductivity Studysupporting

confidence: 67%

Dielectric and impedance spectroscopy of (Ba, Sm)(Ti, Fe)O3 system in the low-medium frequency range

Sahoo

Mahapatra

Choudhary

et al. 2015

J Mater Sci: Mater Electron

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The (Ba, Sm)(Ti, Fe)O 3 system, combination of non-ferroelectric samarium ortho-ferrite and ferroelectric barium titanate, was prepared by using a standard hightemperature solid-state reaction technique. Structural analysis of the material using room temperature XRD data confirmed the formation of the single-phase compound. Detailed structural analysis of the system using Rietveld refinement method exhibits the tetragonal structure with polar space group P4mm. Room temperature micrograph of the sample recorded by a scanning electron microscope shows uniform distribution of grains of various dimension and with less voids confirming the formation of high density sample. Studies of dielectric and impedance spectroscopy characteristics of the sample were carried out in the low-frequency (100-1300 mHz) and the high-frequency region (100 Hz-1 MHz) at different temperatures (25-300°C). The frequency dependence of dielectric constant of both low and high frequency plots was explained on the basis of Maxwell-Wagner mechanism, Shockley Read statistics and Koops phenomenological theories. Ferroelectric phase transition appears in both the low-and high-frequency regions. Nyquist plots show the contributions of grain, grain boundary and electrode effect. The frequency dependence of conduction mechanisms were explained on the basis of correlated barrier hopping model and overlapping large polaron tunneling models.The P-E hysteresis loop confirms the ferroelectricity in the material.

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Section: Ac Conductivity Studysupporting

confidence: 67%

Dielectric and impedance spectroscopy of (Ba, Sm)(Ti, Fe)O3 system in the low-medium frequency range

Sahoo

Mahapatra

Choudhary

et al. 2015

J Mater Sci: Mater Electron

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show abstract

“…The peak frequency for grain boundaries is much smaller than that for grains. This is due to the high resistance and low capacitance of grain boundaries as compared to those of grains [38]. Due to this fact, we attribute the higher frequency response to the grains (small arc) and the lower one to the grain boundaries.…”

Section: Impedance Spectroscopymentioning

confidence: 91%

“…When n is temperature independent, the quantum mechanical tunnelling is expected. However, the correlated barrier hopping is usually associated with decreasing of n with the temperature [38]. Therefore, the correlated barrier hopping conduction mechanism is predominant in the samples with X = 0.02, 0.04, 0.06 and 0.08.…”

Section: [11]mentioning

confidence: 96%

Dielectric and impedance study of polycrystalline Li0.35−0.5Cd0.3Ni Fe2.35−0.5O4 ferrites synthesized via a citrate-gel auto combustion method

Dar

Majid

Batoo

et al. 2015

Journal of Alloys and Compounds

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“…Anyway, the results on the real part of permittivity reported here agree very well with the results reported in Refs. [15][16][17][18][19][28][29][30][31][32][33]. They explain that the high values of permittivity (ԑ'~ 4000 at room temperature) in low frequency range are due to Maxwell Wagner type interfacial polarization coming from grain boundaries and surface polarization.…”

Section: Dielectric Characterizationmentioning

confidence: 99%

CoFe 2 O 4 magnetic ceramic derived from gel and densified by spark plasma sintering

Cernea

Galizia

Ciuchi

et al. 2016

Journal of Alloys and Compounds

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Dielectric relaxation and conduction mechanism of cobalt ferrite nanoparticles

Cited by 129 publications

References 51 publications

Dielectric and impedance spectroscopy of (Ba, Sm)(Ti, Fe)O3 system in the low-medium frequency range

Dielectric and impedance spectroscopy of (Ba, Sm)(Ti, Fe)O3 system in the low-medium frequency range

Dielectric and impedance study of polycrystalline Li0.35−0.5Cd0.3Ni Fe2.35−0.5O4 ferrites synthesized via a citrate-gel auto combustion method

CoFe 2 O 4 magnetic ceramic derived from gel and densified by spark plasma sintering

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