Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 395, Issue -, Pages 159-165Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2015.04.118
Keywords
Sol-gel growth; X-ray diffraction topography; Magnetic properties; Fourier transform infrared spectroscopy; Microwave absorption
Funding
- Higher Education Commission (HEC) of Pakistan
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In order to understand the substitutional effect of rare earth element Sm3+ and divalent Mn2+ on structural, magnetic and microwave absorption properties of hexagonal ferrites, a series of Sr2-xSmx, Ni-2 Fe-28 yMnyO16 X-type hexagonal ferrites with concentration (x=0.00, 002, 0.04, 0.06, 0.08, 0.10 and y=0, 0.1, 0.2, 0.3, 0.4, 0.5) was synthesized by the sol-gel method. The XRD analysis shows that the material crystallized into single X-type hexagonal phase. The absorption bands at low wave number in FTIR curves are the characteristics of the X-type hexagonal ferrites. Decreasing trend in the magnetic properties with the substitution of Sm-Mn contents was also observed, which may be attributed to the oxidation of Mn2+ ions into Mn3+ ions and spin canting effect of rare earth element Sm3+. The reflection loss peak shifted towards the low frequency and microwave absorption properties of the material enhanced with the substitution of Sm-Mn contents which reflects its applications in super high frequency (SHF) devices. The attenuation constant curves are in good agreement with the reflection loss peak. (C) 2015 Published by Elsevier B.V.
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