Electrical conductivity and thermopower studies of titanium-substituted lithium-magnesium ferrites

Purushotham, Y.; Reddy, M. Bhagavantha; Kishan, Pran; Sagar, D.R.; Reddy, P. Venugopal

doi:10.1016/0167-577x(93)90122-e

Cited by 14 publications

(2 citation statements)

References 8 publications

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“…There are many researches that have been reported in the literature on the studies of Li-Zn, Li-Mg, Li-Ti, Li-Cd, Li-Cu, and Li-Ga ferrites [3][4][5][6][7][8]. However, little information is available in the literature regarding the Li-Ni ferrite.…”

Section: Introductionmentioning

confidence: 94%

Structural and Elastic Properties of Li-Ni Ferrite

Mazen

Elmosalami

2011

ISRN Condensed Matter Physics

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Li-Nickel ferrites with the chemical formula Li 0.5−0.5x Ni x Fe 2.5−0.5x O 4 (0.0 ≤ x ≤ 1.0) have been prepared by the ceramic method. The spinel structure in homogenous state was realized by X-ray diffraction analysis. The lattice parameter has been determined for each composition and found to be nearly constant over the whole range of Ni concentration (= 0.83 nm ± 0.01). The cation distribution for each composition has been suggested. The experimental and theoretical lattice constants were found to be in good agreement with each other confirming the agreeability of the suggested cation distribution. The analysis of IR spectra indicates the presence of splitting in the absorption band due to the presence of small amounts of Fe 2+ ions in the ferrite system. The force constants for tetrahedral and octahedral sites have been determined. Young's modulus (E), rigidity modulus (G), bulk modulus (B), Debye temperature (θ D ), and transverse (V t ) and longitudinal (V l ) wave velocities have been determined. The variation of elastic moduli with composition has been interpreted in terms of binding forces between the atoms of spinal lattice.

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Section: Introductionmentioning

confidence: 94%

Structural and Elastic Properties of Li-Ni Ferrite

Mazen

Elmosalami

2011

ISRN Condensed Matter Physics

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“…Many researchers proposed the citrate gel method is a simple route to synthesize materials in the nanocrystalline form due to lower sintering temperature. Several investigations on the properties of the Li-Cd [14], Li-Zn [15], and Li-Mg [16] ferrites have been reported. Mazen and Elmosalami [17] and Bhatu et al [18] have synthesized nickel substituted lithium ferrites by ceramic method with high sintering temperature.…”

Section: Introductionmentioning

confidence: 99%

Structural and Electrical Properties of Li–Ni Nanoferrites Synthesised by Citrate Gel Autocombustion Method

Aravind

Ravinder

Nathanial

2014

Physics Research International

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An attempt has been made to synthesize nanocrystalline lithium-nickel ferrites with a compositional formula Li0.5−0.5xNixFe2.5−0.5xO4 (where x=0.0 to 1.0 with step of 0.2) by a low temperature citrate gel autocombustion method. Single phase cubic structure is confirmed by X-ray diffraction analysis. This result demonstrates that the prepared samples are homogeneous and the sharp peaks reveal that the samples are in good crystalline form. As the Ni concentration is increased, various interesting changes in the values of the structural parameters like lattice parameter, X-ray density, bulk density, and porosity have been observed. The surface morphology of the prepared samples was studied using scanning electron microscopy (SEM). The DC resistivity measurements were carried out using two-probe method from 200°C to 600°C. The variation of log⁡(σT) with reciprocal of temperature shows a discontinuity at Curie temperature. log⁡(σT) versus 1/T plot of the pure lithium ferrites is almost linear which indicates the Curie temperature of the pure lithium ferrites was beyond our measured temperature. The dielectric properties of these ferrites have been studied using a LCR meter from the room temperature to 700 K at various frequencies up to 5 MHz, which reveals that all the prepared samples have dielectric transition temperature around 600 K.

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