Abstract
Bismuth substituted cobalt nano ferrites with the chemical composition Co Bix Fe2-x O4 (x = 0.00, 0.05, 0.10, 0.15, 0.20 & 0.25) were prepared by sol-gel combustion method. The phase identification of prepared samples is characterised by X-ray powder diffraction (XRD) method, which confirms the formation of a single phase fcc spinal structure. The mean crystallite sizes of all prepared samples were obtained within the range of 21 (±5) nm. Transmission Electron Microscopy (TEM) images also confirmed the crystallite size of all the synthesised samples was in nano range. With the effect of Bi3+ ion substitution on spinal cobalt ferrite, the magnetic properties were investigated by using Vibration Sample Magnetometer (VSM). The obtained hysteresis (M-H) curves of all the samples were analysed under the applied magnetic field of range ± 10 K Oe at 300 K. The magnetic properties such as saturation magnetisation (Ms), remnant magnetization (Mr) and coercivity (Hc) values are tabulated, which show a decrease in trend as the bismuth ion concentration increases. This is due to the addition of Bi3+ ion in the place of Fe3+ ion (octahedral site) and hence the Bi3+-Fe3+ ion interaction predominates as compared with the Fe2+-Fe3+ ion interaction. The data obtained from magnetic studies, the variation among the magnetic properties have been investigated for all the prepared samples.
Highlights
Ferrites are well-known magnetic nano particles exhibiting great physiochemical properties
The present work is done to investigate the magnetic properties of bismuth doped cobalt nano ferrites synthesised by sol-gel combustion method
The complete X-ray powder diffraction (XRD) pattern confirms the formation of single phase cubic spinal structure
Summary
Ferrites are well-known magnetic nano particles exhibiting great physiochemical properties. Among the different nano ferrite compositions, cobalt ferrite (CoFe2O4) is one of the best ferromagnetic oxides because of its unique properties such as high coercivity, moderate saturation magnetization, mechanical hardness, chemical stability and high curie’s temperature (~520 ̊C) with large magneto crystalline anisotropy [1]-[3]. Along with these properties, the metal oxides produce high magneto chemical interactions, and have high magnetostriction properties. The distribution of metal cations in the spinal ferrite leads to new materials In this point of view, the authors aim at investigating the magnetic properties of bismuth doped cobalt nanoferrites particles. The present work is done to investigate the magnetic properties of bismuth doped cobalt nano ferrites synthesised by sol-gel combustion method
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