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Document Details
Document Type
:
Article In Journal
Document Title
:
Low-temperature synthesis of nanocrystalline NiCuZn ferrite and the effect of Cr substitution on its electrical properties
Low-temperature synthesis of nanocrystalline NiCuZn ferrite and the effect of Cr substitution on its electrical properties
Subject
:
Chemistry
Document Language
:
English
Abstract
:
In this study, nano-sized ferrites of compositions (Ni0.6Cu 0.20Zn0.20Fe2-xCrxO4), where x=01.0, were synthesized through nitratecitrate auto-combustion method at relatively low temperature. XRD revealed the formation of nano-sized ferrite particles with cubic spinel structure. An exception was obtained for samples with Cr content ≤0.2, where weak diffraction peaks attributed to the presence of CuO and Fe2O3 were appeared. The average crystallite sizes are much dependent on the chromium content and were found to decrease with its increase. The lattice parameter (a) slightly decreases with Cr substitution, which can be explained on the basis of the relative ionic radii of Cr3 and Fe3 ions. X-ray density was found also to decrease slightly with increase in chromium content, which indicates lower densification by the addition of Cr. FT-IR measurements show the characteristic ferrite bands. The Mssbauer spectra varied from Zeeman sextets to a relaxed doublet by increase in Cr content, which indicates a decrease in the hyperfine field at the octahedral site. Electrical property measurements revealed that Cr3 ions do not participate in conduction process but limit the degree of Fe3O2-Fe3 conduction resulting in a decrease in the conductivity and increase in conduction activation energy.
ISSN
:
0304-8853
Journal Name
:
Journal of Magnetism and Magnetic Materials
Volume
:
322
Issue Number
:
20
Publishing Year
:
1431 AH
2010 AD
Article Type
:
Article
Added Date
:
Sunday, October 30, 2011
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
محمد عبدالفتاح جبل
Gabal, Mohamed A
Researcher
Doctorate
mgabalabdonada@yahoo.com
ياسر محمد العنقري
Al Angari, Y M
Researcher
Doctorate
YALANGARI@kau.edu.sa
Files
File Name
Type
Description
31192.pdf
pdf
Abstract
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