Dielectric behaviour of lithium–cobalt mixed ferrites

Venudhar, Y. C.; Mohan, K.S.

doi:10.1016/s0167-577x(01)00551-1

Cited by 22 publications

(11 citation statements)

References 10 publications

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“…The determination of the complex permittivity and permeability at X-band microwave frequencies (8)(9)(10)(11)(12) is based on the perturbation theory [16]. To evaluate the complex permittivity (2 0 2j2 00 ), the sample was placed in a cavity at the position of maximum electric field, where the contribution of magnetic field for the perturbation is minimal.…”

Section: Microwave Measurementsmentioning

confidence: 99%

“…From microwave application point of view, the substituted lithium ferrites are the promising materials when they are used as composites. The manganese-and cobalt-substituted lithium ferrites have been prominent because of high resistivity and high Curie temperature, and are transparent to electromagnetic waves [7][8]. These ferrite-polymer composites, if formed by non-conventional citrate route, have better compositional homogeneity and narrow particle size distribution as compared to the composites obtained by standard ceramic method.…”

Section: Introductionmentioning

confidence: 99%

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Microwave behavior of substituted lithium ferrite composites in X-band

Gupta

Kashyap

Dube

2005

Journal of Magnetism and Magnetic Materials

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Section: Microwave Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microwave behavior of substituted lithium ferrite composites in X-band

Gupta

Kashyap

Dube

2005

Journal of Magnetism and Magnetic Materials

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“…Many workers have studied the frequency dependence of the dielectric constant, dielectric loss tangent and ac conductivity of Li-Ni [6], Li-Co [7], Li-Mg [8] and Li-Ge [9] ferrite systems. However, no reports have been found in the literature on dielectric properties of Mn-substituted lithium ferrites.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and dielectric properties of nanophase manganese-substituted lithium ferrite

Hankare

Patil

Sankpal

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…The X-ray density (ρ x ) and cell volume (V ) are calculated from XRD data using the standard relations [13]. The X-ray density and measured density are found in the ranges 3.37-4.55 g/cm 3 and 5.13-5.57 g/cm 3 . This observed increase in densities is attributed to differences in atomic masses of Cd (112.41) and Mn (54.93).…”

Section: X-rays and Sem Analysismentioning

confidence: 99%

“…Lithium ferrites play vital role in magnetic and microwave industries. These types of ferrite are used in magnetic switches and cathode material in lithium-based batteries [3][4][5]. The dopant concentration affects magnetic parameters such as saturation magnetization, remanence and coercivity, these being strongly influenced by the dopant concentration and these parameters are enhanced with small amount Cd 2+ dopant concentration.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dopants Mn2+ and Cd2+ Concentration on Electrical and Magnetic Properties of Li-Mixed Spinel Nanoferrites

Faraz

Ahmad

2011

J Supercond Nov Magn

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Spinel mixed Li-ferrites with incorporation of various dopants (Cd 2+ and Ni 2+ ) concentration in ranges 0.00 ≤ x ≤ 0.80 are prepared using sol-gel technique. The various phases, lattice constant/parameter, X-ray density and crystallite size are confirmed using X-ray diffraction (XRD). The particle size and lattice parameters are found in the range 15-33 nm and 8.35-8.66 Å. This confirmed that incorporating dopant strongly influences the material structure and an increase is observed in lattice parameter and particle size with increase in dopant concentration. The structure is influenced by the dopant position, at the octahedral (B) and tetrahedral (A) sites. The decrease in activation energy (E) is observed with increase in dopant concentration. Furthermore, analysis of the crystallite size and morphology is done using scanning electron microscopy (SEM), which confirmed that the observed particle size is comparable with the X-ray diffraction (XRD) results. The dopant affects electrical properties such as dc electrical resistivity and drift mobility. The observed trend for drift mobility and dc electrical resistivity confirmed the semiconducting behavior of the synthesized material. The magnetic parameters saturation magnetization (M s ), remanence (M r ) and coercivity (H c ) are strongly affected by dopant concentration. A sudden increase in magnetic parameters M r and M s is observed A. Faraz ( ) Thermal Transport Laboratory (TTL), School of chemical and materials Engineering (by incorporating a small amount of dopant up to x = 0.40 and with further incorporation cause a decrease in the values of these parameters due to the non-magnetic behavior of incorporating dopant Cd 2+ ions. These decreases in values can be explained using the spin canted model and cations positioning at tetrahedral (A) and octahedral (B) sites. The decrease in Curie temperature, observed with increase in dopant incorporation, is due to the decrease/weakening interaction between tetrahedral (A) and octahedral (B) sites.

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Dielectric behaviour of lithium–cobalt mixed ferrites

Cited by 22 publications

References 10 publications

Microwave behavior of substituted lithium ferrite composites in X-band

Microwave behavior of substituted lithium ferrite composites in X-band

Magnetic and dielectric properties of nanophase manganese-substituted lithium ferrite

Effect of Dopants Mn2+ and Cd2+ Concentration on Electrical and Magnetic Properties of Li-Mixed Spinel Nanoferrites

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