Effect of substitution with potassium and chromium oxides on the magnetic and electrical properties of Li-ferrite

Samy, Ahmed M.; Sattar, A. A.; Afify, Ibrahim Hassan

doi:10.1016/j.jallcom.2010.06.052

Cited by 12 publications

(5 citation statements)

References 20 publications

(19 reference statements)

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“…Another factor for the un-homogeneity for 1% substituted samples is the formation of Fe 2+ ions. It is reported that Fe 2+ ions are formed during the preparation condition for ferrites [8]. The concentration of these ions could be greater for samples substituted with 1% than that substituted with 2%.…”

Section: Resultsmentioning

confidence: 99%

“…Also, one of the important properties of magnetic materials is the initial permeability. In general, these two properties depend on the compositions and on the microstructure of ferrites, as well [8][9][10]. In this work we concentrated on the distribution of pores at different sites of substituted Li-ferrite, and its effect on the electrical resistivity as an electrical parameter, and the initial permeability as magnetic parameter.…”

Section: Introductionmentioning

confidence: 99%

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A study of some properties for substituted Li-ferrite using positron annihilation lifetime technique

Aly

Samy

2015

Results in Physics

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a b s t r a c tPositron annihilation lifetime spectroscopy (PALS) is used to investigate polycrystalline substituted Liferrite samples. The dray ceramic technique was used to prepare all investigated samples. The variation of positron annihilation parameters I 1 %, I 2 %, s 1, and s 2 has been demonstrated with porosity and the initial permeability against the ionic radii of substituted ions for Li ferrite. The grain size (G.S.) increased with increasing the ionic radii of the substituted ions for Li-ferrite. The correlation between I 2 and s 2 has opposite behavior with the ionic radii of the substituted ions. Whereas the correlation between I 1 and s 1 ; has nearly the same behavior with the ionic radii of the substituted ions except for V and Gd samples. There is mostly a direct correlation between the electrical resistivity and I 2 values except for Sm sample with increasing the ionic radii of substituted ions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study of some properties for substituted Li-ferrite using positron annihilation lifetime technique

Aly

Samy

2015

Results in Physics

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“…The contribution of the disordered spins in the surface shell to the total magnetic moment is manifested by the high-field susceptibility  HF , being dependent on the surface anisotropy. Assuming the core-shell morphology for one nanoparticle in which the magnetically disordered layer has a constant thickness t, the dependence of magnetization of the sample on the particle size d can be expressed by the following equation [19]: On the other hand, the spontaneous magnetizations of the substituted samples are higher than the calculated values which reveal the siteinterchange between Fe 3+ and Li 1+ in A and B sites, respectively. This result is consistent with the previous studies on the samples with the same composition prepared by the ceramic method [16,21].…”

Section: Magnetization Loops At 5 Kmentioning

confidence: 99%

Effect of chromium substituted on structural and magnetic characterization lithium ferrite nanoparticles

Lan¹,

Tam²,

Duong³

et al. 2017

VJChem

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In this work, we present a structural, morphology and magnetic study of the Li 0.5 Fe 2.5-x Cr x O 4 spinel nanoparticles (x = 0, 0.5, 0.75, 1, and 1.25) with mean particle size of 20-30 nm prepared by sol-gel method. The lattice constants and the size of particle decrease with increasing Cr concentration. In these samples, the preference of Cr 3+ and Li + ions in the octahedral sites and a small degree of site-interchange between Li + in the octahedral sites and Fe 3+ in the tetrahedral sites were found which increases with increasing the Cr content. A decrease of magnetization due to the spin disorder in the surface layer of the particles was observed. The spontaneous magnetization at 5K suggests the Néel type of magnetic ordering in these samples. The magnetic coercivity is discussed in terms of particle size, morphology and chromium substitution.

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“…It is known that the electric, magnetic and dielectric behaviors depend upon structural properties which are greatly influenced by the preparation method [21,22]. Different methods have been used to prepare lithium ferrite (LiFe 5 O 8 ), such as solid-state reaction [23] and conventional ceramic method [24]. Several researchers have studied the frequency and temperature dependence of the dielectric properties of LiFe 5 O 8 [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Study of the temperature and organic bindings effects in the dielectric and structural properties of the lithium ferrite ceramic matrix (LiFe5O8)

Costa

Sohn

Macêdo

et al. 2011

Journal of Alloys and Compounds

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Effect of substitution with potassium and chromium oxides on the magnetic and electrical properties of Li-ferrite

Cited by 12 publications

References 20 publications

A study of some properties for substituted Li-ferrite using positron annihilation lifetime technique

A study of some properties for substituted Li-ferrite using positron annihilation lifetime technique

Effect of chromium substituted on structural and magnetic characterization lithium ferrite nanoparticles

Study of the temperature and organic bindings effects in the dielectric and structural properties of the lithium ferrite ceramic matrix (LiFe5O8)

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