Abstract
Core-shell FeCo/MnZn ferrite powders were prepared by the sol-gel method with ferrite contents ranging from 5.01 wt.% to 17.10 wt.%. The target composition for the MnZn ferrite shell was Mn0.8Zn0.2Fe2O4. The powders were compacted into bulk composites with FeCo separated by an oxide matrix using the field-assisted sintering technique (FAST) at 800°C for 10 min. All resulting compacts achieved relative density > 95%. As the MnZn ferrite content in the original core-shell powder increases from 5.01 wt.% to 17.10 wt.%, the saturation magnetization of the compacts decreases from 222 Am2/kg to 165 Am2/kg, and the coercivity increases from 772 A/m to 1654 A/m. XRD of the compacts indicates that a chemical reaction dissociates the spinel-structured MnZn ferrite into a rocksalt structured phase. Thermodynamics calculation indicates that the reaction happens between FeCo and MnZn ferrite at 800°C, but favors MnZn ferrite at temperatures ≤ 400°C. This prediction was substantiated by FAST consolidation at 400°C.
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The authors gratefully acknowledge the support from NASA SBIR under Contract Number 80NSSC19C0358 and assistance with XRD and SEM/EDS characterization in the Swagelok Center of Surface Analysis of Materials (SCSAM) at Case Western Reserve University.
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Dong, B., Wang, H., Santillan, G. et al. Field-Assisted Sintering of FeCo/MnZn Ferrite Core-Shell Structured Particles. JOM 73, 3901–3909 (2021). https://doi.org/10.1007/s11837-021-04916-3
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DOI: https://doi.org/10.1007/s11837-021-04916-3