NDLI: Structural, Magnetic, and Electrical Properties of Ni$_{0.65}$Zn$_{0.35−x }$Cu$_{ x }$Fe$_{2}$ O $

Content Provider	Springer Nature Link
Author	Venkatesh, Davuluri Himavathi, G. Ramesh, K. V.
Copyright Year	2015
Abstract	Copper-substituted Ni–Zn nanoferrite system having the composition of Ni$_{0.65}$Zn$_{0.35−x }$Cu$_{ x }$Fe$_{2}$O$_{4}$ (x=0.00, 0.05, 0.10, 0.15, 0.20, 0.25) has been prepared by autocombustion method. Structural and magnetic characterizations were done on the as-prepared powders while the dc electrical conductivity measurements were studied on pellets sintered at 900 $^{∘}$C. X-ray diffraction measurements of all the samples showed a single spinel phase. The lattice parameter has been found to decrease with increasing Cu, and this variation in the spinel unit cell is ascribed to the difference in the ionic radius of Cu$^{2+}$ and Zn$^{2+}$ ions. The average crystallite size was determined using the Scherrer equation. The dc electrical resistivity of nanocrystalline starting composition Ni$_{0.65}$Zn$_{0.35}$Fe$_{2}$O$_{4}$ was few orders of magnitude higher than the bulk Ni$_{0.65}$Zn$_{0.35}$Fe$_{2}$O$_{4}$ prepared by conventional ceramic method. However, Curie’s temperatures and dielectric constant were decreased with increasing copper concentration. The observed variation in dc electrical resistivity and activation energy for conduction with Cu$^{2+}$ substitution is attributed to changes in the microstructure, structural defects, and hopping mechanism.
Starting Page	2801
Ending Page	2807
Page Count	7
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	28
Issue Number	9
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2015-05-28
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Citrate gel method X-ray diffraction FT-IR Electrical resistivity Magnetic properties Dielectric measurements Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials Condensed Matter Physics Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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