High frequency dielectric behaviour of aluminium-substituted lithium ferrites

Ravinder, D.; Mohan, G.; Prankishan,; Nitendarkishan,; Sagar, D.R.

doi:10.1016/s0167-577x(00)00039-2

Cited by 33 publications

(14 citation statements)

References 10 publications

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“…In addition dispersion of the values of tan d are observed at low frequencies; tan d then becomes frequency-independent above 20 kHz. [26][27][28] These results can be interpreted on the basis of the strong correlation between tan d and the type of conduction mechanism in the spinel ferrites. 8 The conduction mechanism is mainly depends on the hopping process in the octahedral B site, and a maximum loss peak is observed when the frequency of the external field is equal to the frequency of the hopping process.…”

Section: Dielectric Propertiesmentioning

confidence: 72%

Preparation and Characterization of Zinc-Containing Nickel Gallate Ferrite

Hashhash

Imam

Ismail

et al. 2015

Journal of Elec Materi

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Titanium-Catalyzed Intermolecular Hydroaminoalkylation of ConjugatedDienes. -For the first time the new and highly atom-efficient reaction for the synthesis of homoallylic amines from readily available 1,3-butadienes is presented. The scope of the reaction is still limited [e.g. reaction of (If), (Vb), and (VIIIb)]. Aliphatic dienes (XI) react much more regioselectively than the aromatic ones. -(PREUSS, T.; SAAK, W.; DOYE*, S.; Chem. -Eur.

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Section: Dielectric Propertiesmentioning

confidence: 72%

Preparation and Characterization of Zinc-Containing Nickel Gallate Ferrite

Hashhash

Imam

Ismail

et al. 2015

Journal of Elec Materi

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“…The electronic polarizations can orient themselves with the electric field at the lower frequency range but at higher frequency, the internal individual dipoles contributing to the dielectric constant can't move instantly. So as frequency of an applied voltage increases, the dipole response is limited and the dielectric constant diminishes [17,18,23]. Ordinary dielectric behavior shows for all fired sample and in case of 1,400°C samples a dielectric switching takes place at 33.5 kHz.…”

Section: Resultsmentioning

confidence: 90%

Dielectric switching above a critical frequency occured in iron mullite composites used as an electronic substrate

Paul

Halder

Roy

et al. 2014

J Mater Sci: Mater Electron

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Highly crystallized mullite is synthesized via sol-gel technique in presence of iron of different concentrations at different temperature. FTIR spectroscopy, XRD and FESEM characterization showed prominent mullite phase which is found to depend on the concentrations of Fe 2? ions. The phase evolution and electrical properties like dielectric constant, tangent loss, a.c. conductivity and resistivity of the composites with increasing concentration of the doped metal at different temperature have been studied. The results showed a decrease in mullite phase up to 1.2 (M) which is mainly responsible for the increasing dielectric behavior with respect to undoped mullite. The hematite phase continued to increase with increasing doping concentration. The dielectric constant decreased with frequency for all the samples attaining constancy at higher frequency, which is normal behavior for dielectric ceramics. A.c. conductivity increased with frequency following Jonscher's power law and was found to depend on the amount of glassy phase and concentration of mobile ions present in the composites. The composite showed a minimum dielectric constant of 33.69 at 1.2 (M) concentration of iron at 2 MHz. Thus due to their good dielectric response the composite may widely be used use as electronic substrates like packaging materials for integrated high speed circuits, multilayer capacitors, high voltage insulators etc.

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“…It can be seen also that tan ı versus frequency sometimes shows maxima. These maxima of tan ı as a function of frequency in ferrites are attributed to the coincidence of the hopping frequency of electrons with the frequency of the externally applied field [23][24][25]. The high values of losses may be very important in some future applications that depend mainly on the thermal effect of the losses.…”

Section: Resultsmentioning

confidence: 97%

AC conductivity and dielectric properties of, Zn1−Cu Cr0.8Fe1.2O4 spinel ferrites

Elkestawy

2010

Journal of Alloys and Compounds

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High frequency dielectric behaviour of aluminium-substituted lithium ferrites

Cited by 33 publications

References 10 publications

Preparation and Characterization of Zinc-Containing Nickel Gallate Ferrite

Preparation and Characterization of Zinc-Containing Nickel Gallate Ferrite

Dielectric switching above a critical frequency occured in iron mullite composites used as an electronic substrate

AC conductivity and dielectric properties of, Zn1−Cu Cr0.8Fe1.2O4 spinel ferrites

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