Journal
NEW JOURNAL OF CHEMISTRY
Volume 40, Issue 11, Pages 9275-9284Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nj02121b
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Funding
- DST-FIST, New Delhi through Nanomission project [SR/MN/NS-86/ 2009]
- UGC, New Delhi for SRF under UGC-BSR [F.4-1/ 2006(BSR)/7-69/2007(BSR)]
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Nanocrystalline Co substituted Ni-Zn ferrites with the general formula CoxNi0.6-xZn0.4Fe2O4 (x = 0.0 to 0.6) were prepared by a precursor combustion method. Average crystallite size, as estimated by using a Scherrer method and the particle size obtained from transmission electron microscopy (TEM) techniques, was found to be in the range of 10-30 nm. EDX and XRD analysis confirms the presence of Co, Ni, Zn, Fe and oxygen and the desired phases in the prepared nanoparticles. Selective area electron diffraction ( SAED) analysis confirms the crystalline nature of the prepared nanoparticles. It is observed that Co substitution has a pronounced effect on the magnetic properties such as M-R, M-S and H-C and also on the Curie temperature (TC), which is found to decrease from 420 degrees C for non-substituted Ni- Zn ferrites to 325 degrees C for the highest substitution of x = 0.6. These effects are assigned to the higher magnetocrystalline anisotropy of Co than Ni and to the size dependent existence of single domain-superparamagnetic particles distribution. Comparatively, the dominant existence of single domain particles with Co substitution over superparamagnetic particles in non- substituted nickel zinc ferrites is extensively investigated in this article.
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