Structural and Magnetic Behavioral Improvisation of Nanocalcium Hexaferrites

In modern technoscientific era, the industrial application of nanomaterials has grabbed a paramount importance owing to their improved characteristics. Hexagonal ferrites especially M-type ferrites have been proved to be the promising candidates for nanomaterials by virtue of their ease of applicability in high density recording media, microwave absorption devices, magneto-optic recording media, etc. Keeping a birdʹs view over, the samples of varied combinations of M-type substituted hexaferrites are synthesized using sol–gel combustion route by blending nitrates and chlorides as oxidants accompanied with fuels like urea, glycine, citric acid, etc. as reducing agents. The substitution of Co2+ and Sn4+ ions lie essentially in the octahedral and tetrahedral sites. As the Fe3+ ions are being replaced by Co2+ and Sn4+ ions, the probability of having oxygen vacancies in the structure was found to be greatly reduced. The magnetic particles produced by conventional solid state reactions are often larger than those produced by sol–gel combustion route. Larger particles of magnetic oxides generally exhibit multidomain magnetic structure whereas nanosized particles generally exhibit single domain magnetic structure. The simultaneous or coupled divalent and tetravalent substitution of Co2+ and Sn4+ for Fe3+ ions greatly helps to improvise the magnetic parameters such as Curie temperature, coercivity, remanent magnetization, saturation magnetization, etc. The structural comparison is being analyzed through the XRD, TEM. The samples so synthesized are found to be reseasonably homogeneous and the average particle size of the sample synthesized is found to be in the nanorange. The structural and magnetic properties are observed be improved upon those of the samples reported earlier. This confirms the more viability of such samples in the various applications of digital data devices. Further attempts could possibly lead to investigate their vitality in aerospace and military applications as such applications favors for nanosized magnetic materials.