Structure and magnetic properties of Fe1.95-Ni P1-Si alloys

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

“…x Ni x P 1-y Si y compounds [19]. But in contrast to the latter, at fixed Si content, high Co substitutions eventually lead to the formation of a Co 2 P-type orthorhombic structure.…”

“…So far, improvements of the permanent magnetic properties in the Fe 2 P system have mostly been reached through control of the microstructure rather than compositional adjustments. Yet, very recent theoretical and experimental studies revealed that quaternary compositions can be more promising than (Fe,Co) 2 P ternary compounds [17][18][19][20][21]. A preliminary study on Fe 1.80 Co 0.20 P 1-y Si y and Fe 1.75 Co 0.20 P 1-y Si y powders oriented in magnetic field suggested the possibility to combine high Curie temperatures (up to 640 K) with uniaxial magnetocrystalline anisotropy [18].…”

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

“…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 ].…”

Intrinsic Magnetic Properties of a Highly Anisotropic Rare‐Earth‐Free Fe2P‐Based Magnet

“…Guillou et al reported on mixtures with Si, Co, and Ni doping in polycrystalline materials using ball milling. [23,24] These mixtures do not represent a homogeneous compound with a unique crystal structure. Rather the mixture includes secondary phases, as evidenced by x-ray diffraction (XRD) and the magnetization versus temperature curves.…”