Effect of Tb3+ substitution on structural, electrical and magnetic properties of sol–gel synthesized nanocrystalline nickel ferrite

Jacob, Binu P.; Thankachan, Smitha; Xavier, Sheena; Mohammed, E. M.

doi:10.1016/j.jallcom.2013.04.147

Cited by 96 publications

(26 citation statements)

References 45 publications

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“…The dielectric constant decreases gradually with frequency in all the three cases ( Fig. 5(a)), the decrease being more rapid in the low frequency region and slow in the high frequency region, and such a behavior has been commonly reported [2,26,32,33]. The decrease in dielectric constant with frequency can be explained by Koop's theory, which considers the dielectric as a MaxwellWagner type inhomogeneous medium consisting of conducting grains separated by highly resistive grain boundaries [26].…”

Section: Dielectric Propertiessupporting

confidence: 59%

“…Nickel ferrite (NiFe 2 O 4 ) is one of the most important soft ferrites with unique properties, exhibiting high electromagnetic performance, low coercivity, good mechanical hardness and chemical stability. These attractive properties are found useful for applications in microwave devices, memory devices, and transformer cores [2]. NiFe 2 O 4 (NFO) has an inverse spinel structure in which the ferric ion occupies both tetrahedral (A-site) and octahedral (B-site) sites, and Ni 2 þ occupies the octahedral site (B-site) and the compound can be represented by the chemical formula as [Fe 3 þ ] A [Ni 2 þ Á Fe 3 þ ] B O 4 where A and B represent the tetrahedral and octahedral sites respectively [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dielectric and magnetic properties of Nickel ferrite ceramics using crystalline powders derived from DL alanine fuel in sol–gel auto-combustion

Chauhan

Shukla

Sreenivas

2015

Ceramics International

132

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Section: Dielectric Propertiessupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Dielectric and magnetic properties of Nickel ferrite ceramics using crystalline powders derived from DL alanine fuel in sol–gel auto-combustion

Chauhan

Shukla

Sreenivas

2015

Ceramics International

132

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“…ion concentration. Similar increase in porosity with increase in particle size with rare earth doping has been reported [18].…”

Section: Xrd Analysissupporting

confidence: 83%

“…Similar increase in crystallite size with Tb 3? ion in NiFe 2 O 4 is reported by Binu et al [18]. The X-ray density increases with increase in Gd 3?…”

Section: Xrd Analysismentioning

confidence: 63%

Effect of Gd3+ substitution on the structural and electrical properties of Mg0.75Zn0.25Fe2O4 nanoparticles

Sebastian¹,

Mohammed²

2016

Indian J Phys

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Nanoparticles of gadolinium substituted Mg-Zn ferrite, Mg 0.75 Zn 0.25 Gd x Fe 2-x O 4 (where x = 0.00, 0.05, 0.10, 0.15) have been prepared by the sol-gel technique. The lattice constant is found to increase with increase in the Gd 3? ion concentration. The observed variation of dielectric constant with frequency is explained on the basis of the MaxwellWagner two layer model and the electron hopping mechanism. The dielectric constant and dielectric loss decrease with Gd 3? ion substitution. The variation of AC conductivity with frequency suggests that the conduction is due to small polaron hopping. It is also noticed that the dielectric constant and the AC conductivity increase with temperature and it is explained in terms of the thermally enhanced drift mobility of the charge carriers. The observed low value of dielectric constant and also the dielectric loss factor obtained for gadolinium substituted ferrites make them desirable for high frequency applications.

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“…All the peaks of as-prepared and sintered samples matched with the mentioned reference cards. The analysis showed that samples have a cubic spinel ferrite structure [10,11]. The width of XRD peaks of the sintered sample has reduced and the peaks have become more visible due to the release of stresses, strains and dislocations from the crystal structure of the sample [12].…”

Section: Structural Analysismentioning

confidence: 99%

Electrical Properties of Ni-Zn Ferrite Nanoparticles Prepared by Simplified Sol-Gel Method

Munir

Ahmed

Saqib

et al. 2014

J Supercond Nov Magn

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Ferrites have become the source of attention for scientists due to their variety of physical properties. Their massive use in the electronics industry has made the study of their dielectric, thermal, and optical properties unavoidable. These materials have potential applications in high-frequency devices. The empirical formula for the synthesized nanoparticles is given by Ni 0.5 Zn 0.5 Fe 2 O 4 . Nanoferrites were prepared by a simplified sol-gel method. The crystalline phase; crystallite size; surface morphology; dielectric properties such as AC conductivity (σ AC ), dielectric constant ( ), and dielectric loss (tanδ) as a function of frequency at different temperatures; and DC electrical resistivity as a function of temperature were studied. The Ni-Zn nanoferrite was sintered at 550 • C. The X-ray diffraction (XRD) results showed a spinel cubic structure having a lattice constant a = 8.383Å and crystallite size of 12 nm for the (311) peak after sintering. Scanning electron microscopy showed the particle morphology of the samples. AC conductivity (σ AC ) increases with frequency as well as the temperature. DC resistivity decreased with increase in temperature. The observed behavior could be explained by the Maxwell-Wagner model. Parameters observed were correlated to understand the conduction mechanism.

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Effect of Tb3+ substitution on structural, electrical and magnetic properties of sol–gel synthesized nanocrystalline nickel ferrite

Cited by 96 publications

References 45 publications

Dielectric and magnetic properties of Nickel ferrite ceramics using crystalline powders derived from DL alanine fuel in sol–gel auto-combustion

Dielectric and magnetic properties of Nickel ferrite ceramics using crystalline powders derived from DL alanine fuel in sol–gel auto-combustion

Effect of Gd3+ substitution on the structural and electrical properties of Mg0.75Zn0.25Fe2O4 nanoparticles

Electrical Properties of Ni-Zn Ferrite Nanoparticles Prepared by Simplified Sol-Gel Method

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