Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 16, Pages 5119-5126Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.01.193
Keywords
Nanoferrites; Metal-to-semiconductor transition; temperature; Mossbauer Spectroscopy; Electrical properties; AFM; X-ray diffraction
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Funding
- higher education commission (HEC) of Pakistan [20-1515/RD/09-8049]
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Spinel nickel ferrite with nominal composition NiFe2-xSbxO4 (where x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1) has been synthesized by the reverse microemulsion method. The samples synthesized were characterized by XRD, FTIR, TGA/DTGA, SEM, AFM, Mossbauer Spectroscopy and DC electrical resistivity measurements. The XRD analysis confirmed the formation of single spinel phase and the crystallite size was found to be in the range of 8-38 nm. The particle size of the synthesized samples was also confirmed by the AFM and SEM which was found in the range of 5-45 nm and 10-45 nm, respectively and this size is small enough for obtaining the suitable signal-to-noise ratio in high density recording media. The Mossbauer spectra of samples showed two well-resolved Zeeman patterns corresponding to A and B sites and also observed a doublet at higher substitution. The DC electrical resistivity showed an interesting behavior with temperature and observed a metal-to-semiconductor transition temperature (TM-S) which suggests that the material can be applied for switching applications. The resistivity increases with the increase in Sb-content and it suggests that the material can be fruitfully used for applications in microwave devices. (C) 2011 Elsevier B.V. All rights reserved.
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