Microwave Synthesis of Nickel Ferrite: Structure, Morphology and Bonding

Bhavikatti, A M; Kulkarni, S. P.; Lagashetty, Arun Kumar

doi:10.13005/msri/040228

Cited by 4 publications

(5 citation statements)

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“…Gupta et al [8], have reported the properties of cobalt-substituted lithium ferrite in the GHz frequency range of cobalt ferrite. Bhavikatti et al [9] reported the magnetic and transport properties of cobalt ferrite. The aim of this work is to modify the electrical properties of the samples either in the conduction mechanism or the type of the conduction (from nto p-type), by introducing Cu 2+ instead of Co 2+ .…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of Cu substituted Co nano ferrite

2012

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The samples Co1−xCuxFe2O4 (0.0 ⩽ x ⩽ 0.6) were prepared using the standard ceramic method. The dielectric constant (ε′), dielectric loss (tan δ) and ac conductivity (σ) were measured at room temperature as a function of the frequency. The results of the dielectric properties were explained on the basis of Maxwell–Wagner behaviour. The effect of Cu2+ ion substitution on the ac electrical conductivity and dielectric properties at different frequencies, 0.1–1000 kHz, were studied. The data revealed that ε′ and tan δ increased as the Cu2+ ion increased, due to the increase in the number of vacancies at the iron site. The Cu2+ ions change the conduction from an n- to a p-type. The Seebeck coefficient (dV/dT) mV K−1 gives a positive sign (p-type) for all samples up to ≈500 K, except for x = 0.6, for which it gives a negative sign. This indicates that the conduction is predominantly caused by electrons hopping between Fe3+↔Fe2+. The mobility was calculated and found to increase with an increasing Cu content.

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Section: Introductionmentioning

confidence: 99%

Electrical properties of Cu substituted Co nano ferrite

2012

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“…The interfacial polarization increases with temperature due to creation of crystal defects and dipolar polarization. The effect of temperature is more pronounced on the interfacial polarization than that of the dipolar polarization which results in the rapid increase in dielectric constant with increasing temperature at low frequencies[16,30]. The interfacial polarization can be understood by Maxwell-Wagner two layer model.…”

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confidence: 99%

Dielectric properties of nanocrystalline Co-Mg ferrites

Sharma

Parashar

et al. 2015

Journal of Alloys and Compounds

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“…At higher frequencies range, losses are found to be low if the domain wall motion is restrained as per Rezlescu model. 32,35 Moreover, the tan d rises when the polarization lags behind the applied alternating electric eld. This rise in tan d may also be caused by the grain boundaries, imperfections in the crystal lattice, and impurities.…”

Section: Resultsmentioning

confidence: 99%