Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 10, Pages 15569-15575Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.07.033
Keywords
Ni-Cd ferrites; Cation distribution; EDTA; Magnetic moment; Y-K model
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Funding
- Payame Noor University
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Nanocrystalline samples with stoichiometric composition and general formula of Ni1-xCdxFe2O4 (x=0.0, 0.1, 0.3, 0.5, and 0.7) were synthesized by the sol gel auto-combustion method. Structure and crystallite size were analyzed using X-ray diffraction data and revealed spinel mono-phase formation in the range of nanometric crystallite size (12-31 nm), which was also confirmed using field emission scanning electron microscopy (FE-SEM). The absence of the organic phase and spmel formation were monitored by Fourier transform infrared (FTIR) spectroscopy. Saturation magnetization at room temperature was found to increase with Cd content up to x=0.3 and then tended to decrease for x > 0.3. Increase in magnetic moment with Cd is explained by Neel's two-sublattice (tetra and octahedral sublattice) collinear models, according to which the magnetic moment is the vector sum of the lattice magnetic moment. Decrease in magnetization for x > 0.3 samples could be explained by Yafet-Kittel model. Also, coercivity was decreased by increasing Cd content due to the decrease of magnetocrystalline anisotropy constant of the samples. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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