期刊
CERAMICS INTERNATIONAL
卷 44, 期 15, 页码 17812-17823出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.06.249
关键词
Co-Zr substituted calcium hexaferrite; Magnetic properties; Anisotropy constant; AC conductivity; Mossbauer analysis; Cole-Cole plots
资金
- Gujarat Council on Science and Technology (GUJCOST), Gandhinagar, India [GUJCOST/MRP/14-15/1119]
- UGC, New Delhi, India [F.530/10/DRS/2010]
- DST, India [SR/FST/PSI-198/2014]
Polycrystalline nanoparticles of M-type Ca(ZrCo)(x)Fe12-2xO19 (0.0 <= x <= 1.0) hexaferrites were prepared using a simple heat treatment method at a low heating temperature of 650 degrees C. Effect of cobalt-zirconium substitution on the structural, microstructural, magnetic and dielectric properties was investigated. XRD analysis indicates that all the samples possess a hexagonal structure with anti-ferromagnetic alpha-Fe2O3 phase. The values of lattice parameters and cell volume found to be increased with increasing the cobalt-zirconium substitution along with the amount of alpha-Fe2O3 phase. Crystal symmetry has not affected by Zr-Co substitution in prepared calcium hexaferrite samples but the position of diffraction peak [108] is found to shift towards a lower angle as an increase in the substitution of Zr-Co. The crystallite size found to vary between 12 and 17 nm. SEM images show agglomerated grains and surface morphology has changed with Zr-Co substitution. EDX analysis of typical samples revealed the presence of Ca, Fe, Co, Zr. The magnetic analysis revealed the formation of multi-domain structure. Room temperature Mossbauer spectra of prepared samples show that all five sextets are merged together with a paramagnetic doublet and it confirmed that the size of particles is very small in the nano range. Single and double semicircle arcs were observed in Cole-Cole plots, due to the contributions of grain and grain boundaries resistance.
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