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Structural and some magnetic properties of manganese-substituted lithium ferrites
Faculty
Science
Year:
2012
Type of Publication:
Article
Pages:
3366-3373
Authors:
Mazen, S. A, Abu-Elsaad, N. I
DOI:
10.1016/j.jmmm.2012.05.056
Journal:
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS ELSEVIER SCIENCE BV
Volume:
324
Research Area:
Materials Science; Physics
ISSN
ISI:000306107800023
Keywords :
Ferrite, X-ray, SEM, Magnetization, B-H loop and initial permeability
Abstract:
The structural and magnetic properties of Mn-substituted lithium ferrites having the general formula Li0.5-0.5xMnxFe2.5-0.5xO4 (where x=0.0-1.0) prepared by the standard ceramic technique have been studied. Single phase cubic structure is confirmed by X-ray diffractometer. This result demonstrates that the samples are homogeneous, and the sharp peaks reveal that the samples are in crystalline form. The lattice parameter `a' and average grain diameter `D' increase with increasing Mn2+ ion substitution. The saturation magnetization and the experimental magnetic moment are found to increase with manganese up to x=0.5 and then tends to decrease for x > 0.5. The increase in magnetic moment with manganese is attributed to Neel's two sublattice model according to which the magnetic moment is the vector sum of lattice magnetic moment. The decrease in magnetization for x > 0.5 obeys the Yafet-Kittel (Y-K) model. The increase in Y-K angles for x >= 0.5 indicates the increased favor for triangle spin arrangements on B-sites. This suggests the existence of canted spin structure in the ferrite system with higher content of Mn. Hystersis loops were measured. The initial permeability mu(i) was measured as a function of temperature. (C) 2012 Elsevier B.V. All rights reserved.
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