Crystal structures and magnetic properties of Fe1.93-Co P1-Si  compounds

Lingling-Bao,; Yibole, H.; Xu, Jun; Ou, Z.Q.; Haschuluu, O.; Tegus, O.; Dijk, N.H. van; Brück, E.; Guillou, F.

doi:10.1016/j.jallcom.2022.163770

Cited by 3 publications

(1 citation statement)

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“…Simultaneous metal and metalloid substitutions have been theoretically proposed to overcome some of the limitations of ternary compounds and maintain a uniaxial magnetocrystalline anisotropy while increasing the Curie temperature [ 25 ]. Recent experimental studies in bulk (Fe,Co) 2 (P,Si) polycrystalline materials have indeed shown that simultaneous metal and metalloid substitutions can raise the Curie temperature ( T C up to 650 K) while maintaining a relatively large c -axis uniaxial magnetocrystalline anisotropy and the desired hexagonal Fe 2 P-type structure [ 26 , 27 , 28 ]. Single-crystal studies have confirmed the combination of significant room-temperature anisotropy ( K 1 in the range 0.9 to 1.1 MJ m −3 ), sizable saturation magnetization (corresponding to saturation polarization of 0.8–1.0 T at room temperature) and high Curie temperatures, making (Fe,Co) 2 (P,Si) quaternary alloys intrinsically promising for permanent magnet applications [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Sintering Conditions of (Fe,Co)1.95(P,Si) Compounds for Permanent Magnet Applications

Yiderigu,

Yibole,

Bao

et al. 2024

Materials

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(Fe,Co)2(P,Si) quaternary compounds combine large uniaxial magnetocrystalline anisotropy, significant saturation magnetization and tunable Curie temperature, making them attractive for permanent magnet applications. Single crystals or conventionally prepared bulk polycrystalline (Fe,Co)2(P,Si) samples do not, however, show a significant coercivity. Here, after a ball-milling stage of elemental precursors, we optimize the sintering temperature and duration during the solid-state synthesis of bulk Fe1.85Co0.1P0.8Si0.2 compounds so as to obtain coercivity in bulk samples. We pay special attention to shortening the heat treatment in order to limit grain growth. Powder X-ray diffraction experiments demonstrate that a sintering of a few minutes is sufficient to form the desired Fe2P-type hexagonal structure with limited secondary-phase content (~5 wt.%). Coercivity is achieved in bulk Fe1.85Co0.1P0.8Si0.2 quaternary compounds by shortening the heat treatment. Surprisingly, the largest coercivities are observed in the samples presenting large amounts of secondary-phase content (>5 wt.%). In addition to the shape of the virgin magnetization curve, this may indicate a dominant wall-pining coercivity mechanism. Despite a tenfold improvement of the coercive fields for bulk samples, the achieved performances remain modest (HC ≈ 0.6 kOe at room temperature). These results nonetheless establish a benchmark for future developments of (Fe,Co)2(P,Si) compounds as permanent magnets.

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