Magnetic, electrical and dielectric behaviour of Ni0.8Zn0.2Fe2O4 prepared through flash combustion technique

Mangalaraja, Ramalinga Viswanathan; Ananthakumar, S.; Manohar, P.; Gnanam, F. D.

doi:10.1016/s0304-8853(02)00413-4

Cited by 148 publications

(56 citation statements)

References 35 publications

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“…Space charge polarization is known to dominate when the material is composed of grain and grain boundaries. 2,[39][40][41] With increasing temperature, Debye peaks are seen to move to the higher frequency side due to an increase in the rate of hopping of electrons. Also, Z decreases with increasing temperature due to the decreasing loss in the resistive part of the sample.…”

Section: Resultsmentioning

confidence: 99%

Microstructure, AC impedance and DC electrical conductivity characteristics of NiFe2-xGdxO4 (x = 0, 0.05 and 0.075)

Bharathi¹,

Markandeyulu

Ramana³

2012

AIP Advances

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The structure and electrical characteristics of Gd doped Ni ferrite materials, namely NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4, are reported to demonstrate their improved electrical properties compared to that of pure NiFe2O4. NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4 compounds crystallize in the cubic inverse spinel phase with a very small amount of GdFeO3 additional phase while pure NiFe2O4 crystallize in inverse spinel phase without any impurity phase. The back scattered electron imaging analysis indicate the primary and secondary formation in NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4 compounds. Atomic force microscopy measurements indicate that the bulk grains are ∼2-5 micron size while the grain boundaries are thin compared to bulk grains. Impedance spectroscopic analysis at different temperature indicates the different relaxation mechanisms and their variation with temperature, bulk grain and grain-boundary contributions to the electrical conductivity (Rg) and capacitance (Cg) of these materials. The conductivity in pure NiFeO4 is found to be predominantly due to intrinsic bulk contribution (Rg=213 kΩ and Cg=4.5 x 10-8 F). In the case of NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4 compounds, grain and grain-boundary contributions to the conductivity are clearly observed. The DC conductivity values (at 300 K) of NiFe2O4, NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4 compounds are found to be 1.06 x 10-7 Ω-1 cm-1, 5.73 x 10-8 Ω-1 cm-1 and 1.28 x 10-8 Ω-1 cm-1 respectively.

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Section: Resultsmentioning

confidence: 99%

Microstructure, AC impedance and DC electrical conductivity characteristics of NiFe2-xGdxO4 (x = 0, 0.05 and 0.075)

Bharathi¹,

Markandeyulu

Ramana³

2012

AIP Advances

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“…The DC electrical resistivity of the ferrite materials was decided by the chemical composition, type of materials used, preparation method, sintering temperature, crystallite size, density, porosity, crystallography of the samples and type of cations substitutions in the ferrite lattice [46]. Ferrite electrical resistivity may alter by substitution of suitable divalent or trivalent ions occupying into the tetrahedral or octahedral sites.…”

Section: Electrical Resistivitymentioning

confidence: 99%

Dielectric Response of Nix Zn1-x Al Fe O4 Nanoferrites

Donta¹,

Katrapally²,

Pendyala³

2016

NanoWorld J

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Ni-Zn-Al nanoferrites of general formula Ni x Zn 1-x Al Fe O 4 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were synthesized by sol-gel auto combustion technique. The X-ray diffraction and FTIR studies confirmed the formation of single cubic spinel structure. Dielectric performance and AC conductivity of prepared mixed nanoferrites were carried out using LCR impedance meter. It was observed that both dielectric constant and dielectric loss were decreased by increasing the frequency whereas AC conductivity increases with applied frequency but decreases with increasing the Ni 2+ ion substitution for a fixed Al 3+ ion concentration. DC resistivity, activation energy and Curie temperature were calculated by using the two probe experimental method. It was observed that DC resistivity decreased whereas the charge mobility increased with increasing the temperature. DC resistivity and activation energy of the nanoferrite samples were increased with Ni 2+ ion substitution for a fixed Al 3+ ion concentration.

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“…Relative loss factor is the ratio of tanδ to initial permeability. Relative loss factor is measured from 1 kHz to 1 MHz as suggested by many authors [30][31]. The relative loss factor is seen to be decreasing up to 10 MHz and after this it remains smooth.…”

Section: Edx Analysismentioning

confidence: 85%

“…The frequency at which relative loss factor decreases and has minimum value is called threshold frequency. The low loss factor value indicates high purity of samples obtained by non conventional (wet) method [31]. …”

Section: Edx Analysismentioning

confidence: 99%

New EM Transmitter with Y3Fe5O12 Based Magnetic Feeders Potentially Used for Seabed Logging Application

Akhtar

Yahya

Nasir

2013

AMR

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Abstract. Sea bed logging (SBL) is a new technique for detection of deep target hydrocarbon reservoir. Powerful electromagnetic (EM) transmitter is required for the transmission of EM signal underneath the seabed. New aluminum transmitter with yttrium iron garnet (Y 3 Fe 5 O 12 ) based magnetic feeders was used in a scale tank to increase the magnitude of the magnetic field. Yttrium iron garnet samples were prepared using self combustion technique at different sintering temperatures of 750°C, 950°C and 1150°C. Characterizations of Y 3 Fe 5 O 12 samples were done by using XRD, RAMAN, FESEM and Impedence network analyser. X-ray diffraction results revealed that yttrium iron garnet phase with good crystallinity appeared at sintering temperature of 1150°C. Nanoparticles size ranging from 60 to 110 nm was investigated. Raman results also confirmed garnet structure of yttrium iron garnet at sintering temperature of 1150°C. Field emission scanning electron microscopy (FESEM)

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Magnetic, electrical and dielectric behaviour of Ni0.8Zn0.2Fe2O4 prepared through flash combustion technique

Cited by 148 publications

References 35 publications

Microstructure, AC impedance and DC electrical conductivity characteristics of NiFe2-xGdxO4 (x = 0, 0.05 and 0.075)

Microstructure, AC impedance and DC electrical conductivity characteristics of NiFe2-xGdxO4 (x = 0, 0.05 and 0.075)

Dielectric Response of Nix Zn1-x Al Fe O4 Nanoferrites

New EM Transmitter with Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> Based Magnetic Feeders Potentially Used for Seabed Logging Application

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