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      • KCI등재

        Impacts of Sr2+ and Annealing Temperature on the Composition, Structure, and Magnetic Properties of SrFe12O19 Synthesized by Tartrate Precursor Route

        M. M. Hessien,Mahdi Albogamy,Mohammed Alsawat,Abdulrahman Alhadhrami 한국자기학회 2023 Journal of Magnetics Vol.28 No.2

        Hexagonal M-type strontium ferrite (SrFe12O19) has been fabricated through a simple self-combustion tartrate precursor approach to producing a homogenous powder with a homogeneous shape and limited size distribution at low-processing temperatures. The impacts of the Sr2+:Fe3+ molar ratio and the annealing temperature on formation, morphological structure, crystallite size, and magnetic performance were studied. The powders were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) profile, and vibrating sample magnetometer (VSM). The development of crystalline single-phase Sr-hexagonal ferrite occurred at ≥ 1100 °C and Sr2+:Fe3+ molar ratios 1.1:12-1.3:12. Existence of α-Fe2O3 and impurities in the hexagonal powders increases the lattice parameters while higher annealing temperature decreases it. The c/a ratios of as-prepared samples (~3.911-3.920) are comfortably within the range of ratios for M-type structures. The platelet-like structure has appeared at an annealing temperature ≥ 1000 °C. The wide saturation magnetization (37.26-66.19 emu/g) and coercivity (275.09-2107.8Oe) were accomplished at diverse synthesis conditions and reached the greatest values at 1350 °C. The squareness ratios (Mr/Ms) for all studied samples are <0.5, which is for multimagnetic domains.

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