Effect of ytterbium on the electrical properties of Li–Co ferrite

Ahmed, Mohamed; Bishay, Samiha T.; Abdelatif, G.

doi:10.1016/s0022-3697(00)00267-5

Cited by 60 publications

(21 citation statements)

References 6 publications

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“…But with further increase in temperature after a particular level there will be a decrease in internal viscosity of the system which in turn give rise to more degrees of freedom to the dipole resulting in the increase of the disorder of the system [28] thus decreasing the dielectric constant. Similar variation of dielectric constant with temperature is reported in zinc substituted nickel ferrite [28], lanthanum substituted Ni-Zn ferrite [29] and ytterbium substituted Li-Co ferrite [24].…”

Section: Real Part Of Dielectric Permittivity (E R )supporting

confidence: 81%

“…The initial decrease of e r present in the Gd 3? doped samples is an indication of the metallic nature of the samples at low temperature as a result of gadolinium doping [24]. With further increase in temperature, the hopping electrons will be thermally activated leading to increase in hopping frequency.…”

Section: Real Part Of Dielectric Permittivity (E R )mentioning

confidence: 99%

“…All the other compositions exhibit similar behavior. The decrease in conductivity at low temperatures may be due to the phonon-electron effect, elastic and inelastic scattering due to the rare earth ions and the effect of residual part due to impurities [24]. As temperature is increased beyond the metallic region the thermally enhanced drift mobility of charge carriers increases the conductivity with temperature.…”

Section: Ac Conductivitymentioning

confidence: 99%

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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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Section: Real Part Of Dielectric Permittivity (E R )supporting

confidence: 81%

Section: Real Part Of Dielectric Permittivity (E R )mentioning

confidence: 99%

Section: Ac Conductivitymentioning

confidence: 99%

See 1 more Smart Citation

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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“…The frequency independent dielectric constant at higher frequencies is known as static value of dielectric constant. The reason behind this is failure of electric dipoles to follow the fast varying alternating electric field which increases the friction between them [36][37][38]. …”

Section: Magnetic Propertiesmentioning

confidence: 99%

Phase formation, microstructure, electrical and magnetic properties of Mn substituted barium titanate

Rani

Kolte

Gopalan

2015

Ceramics International

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“…But at higher frequencies, the dielectric constant remains independent of frequency may be due to the inability of electric dipoles to follow the fast variation of alternating applied electric field and accordingly the friction between them will increase. A quantity of heat will thus be generated and internal viscosity of system, as well as dielectric constant, may decrease [12]. It is evinced from Fig.…”

Section: Fig 4: Ir Spectra For Various Compositesmentioning

confidence: 92%

Influence of Fe<sup>3+</sup> Ion Substitution on Thermal and Dielectric Properties of Titanium Dioxide

Hunagund

Chavan

Desai

et al. 2016

ILCPA

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ABSTRACT. Thermal and dielectric characteristics of Fe 2 O 3 doped TiO 2 (FDT) nanopowder is investigated. Formation of FDT was prepared using the formula [1-x] TiO 2 + [x] Fe 2 O 3 by solid state reaction method. The Surface morphology was studied using atomic force microscopy (AFM) technique; it reveals the average particle size in the range of 180 to 200 nm. FT-IR analysis reveals weak transmittance bands between 1020 to 1650 cm -1 and 2800 to 3500 cm -1 which show a gradual decrease in peak intensities with an increase of Fe concentration. Thermal stability was assessed by Thermogravimetric analysis (TGA). Results of TGA profiles indicate that all FDT nanopowder was found to be thermally stable between 400˚C to 600˚C. The dielectric behavior of the said composite has been investigated as a function of frequency (20 Hz -1 MHz) at room temperature and it is observed that the dielectric constant decreases with increasing frequency indicating dispersion behavior.

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Effect of ytterbium on the electrical properties of Li–Co ferrite

Cited by 60 publications

References 6 publications

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

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

Phase formation, microstructure, electrical and magnetic properties of Mn substituted barium titanate

Influence of Fe<sup>3+</sup> Ion Substitution on Thermal and Dielectric Properties of Titanium Dioxide

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