Journal ArticleDOI
Temperature dependence of electrical properties of nickel–zinc ferrites processed by the citrate precursor technique
TLDR
In this article, temperature dependence of resistivity, dielectric constant and Dielectric loss have been investigated for four different compositions of nickel-zinc ferrites, Nii_IZnIFe2O4 (x = 0.2, 0.5 and 0.6), prepared by the citrate precursor technique, and the variations in activation energy with composition and sintering temperature were explained on the basis of the site occupancy in ferrites and the atomic radii of the constituent metal ions.Abstract:
Temperature dependence of resistivity, dielectric constant and dielectric loss have been investigated for four different compositions of nickel-zinc ferrites, Nii_IZnIFe2O4 (x = 0.2, 0.35, 0.5 and 0.6), prepared by the citrate precursor technique. Activation energies calculated from the resistivity versus temperature curves for the compositions sintered at 1200 °C and 1300 °C range from 0.55 eV to 0.73 eV. Samples sintered at 1200 °C exhibit higher activation energies and low dielectric losses compared to those sintered at 1300 °C. Samples of the composition with x = 0.6 show low dielectric losses up to a measurement temperature of around 200 °C at higher frequencies as compared to samples of other compositions. The variations in activation energy with composition and sintering temperature have been explained on the basis of the site occupancy in ferrites and the atomic radii of the constituent metal ions.read more
Citations
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Electrical and magnetic characterization of nanocrystalline Ni–Zn ferrite synthesis by co-precipitation route
TL;DR: In this paper, the powder X-ray diffraction (XRD) patterns confirm the single phase spinel structure for the synthesized materials and the crystallite size was calculated from the most intense peak (3-1-1) using the Scherrer formula.
Journal ArticleDOI
Structural characteristics, electrical conduction and dielectric properties of gadolinium substituted cobalt ferrite
TL;DR: In this paper, a two-layer heterogeneous model consisting of semiconducting grains separated by insulating grain boundaries was able to account for the observed temperature and frequency dependent electrical properties in CFGO ceramics.
Journal ArticleDOI
Metal-semiconductor transition in NiFe2O4 nanoparticles due to reverse cationic distribution by impedance spectroscopy
TL;DR: In this article, the magnetic and electrical response of the sol-gel synthesized NiFe2O4 nanoparticles is investigated and changes in the impedance plane plots with temperature have been discussed and correlated to the microstructure of the material.
Journal ArticleDOI
Enhanced magneto-optical and photo-catalytic properties of transition metal cobalt (Co2+ ions) doped spinel MgFe2O4 ferrite nanocomposites
A. Godlyn Abraham,Ayyar Manikandan,Elayaperumal Manikandan,Elayaperumal Manikandan,Elayaperumal Manikandan,Sethumathavan Vadivel,Saravana Kumar Jaganathan,Saravana Kumar Jaganathan,Abdulhadi Baykal,P. Sri Renganathan +9 more
TL;DR: In this paper, the effects of cobalt ions on morphology, structural, optical, magnetic and photo-catalytic properties of spinel Co x Mg 1−x Fe 2 O 4 nanocomposites were investigated.
Journal ArticleDOI
Effect of zinc concentration on the structural, electrical and magnetic properties of mixed Mn–Zn and Ni–Zn ferrites synthesized by the citrate precursor technique
TL;DR: In this paper, mixed manganese-zinc and nickel zinc ferrites of composition Mn0.2Ni0.8−xZnxFe2O4 where x = 0.4, 0.5 and 0.6 were synthesized by the citrate precursor technique.
References
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Journal ArticleDOI
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TL;DR: In this article, an einigen gesinterten Stabchen aus Magnetit (Fe 3 O 4 ) wird festgestellt dass sich der elektrische Widerstand bei Uberschreitung eines Umwandlungpunktes in der Umgebung von 100-200°K sprunghaft andert.
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Principles of electronic ceramics
Larry L. Hench,Jon K. West +1 more
TL;DR: In this paper, the band theory of solids semiconductors ionic and defect conductors linear dielectrics nonlinear dielectric magnetic ceramics photonic and optical waveguides optical waveguide glass and crystalline lasers ceramic superconductors.