Search

The magnetic and electronic properties of Fe 77 X 5 Si 4 B 10 P 4 (X = V, Cr, Mn, Fe, Co, and Ni) metallic glasses were investigated based on first-principle calculations. While the ability of losing electrons is increasingly weaker, that of acquiring charges is stronger with increasing the number of valence electrons from V to Ni atoms. For the addition of V, Cr, and Mn nonmagnetic atoms, while they all behave antiferromagnetic character, the magnetic moments of nearest neighboring (NN) Fe atoms around them are weaker compared to that of Fe 82 Si 4 B 10 P 4 , resulting from the strong hybridization between 3 d states of impurity and Fe. For Co and Ni magnetic atoms, while the magnetic moments of NN Fe atoms are increasingly stronger than that in Fe 82 Si 4 B 10 P 4 , the local magnetic moments of additive atoms reduce. These result in that the addition of X atoms weakens the saturation magnetic flux density of Fe 82 Si 4 B 10 P 4. Moreover, if Co with a minor proportion is incorporated, it will enhance the total magnetization compared to Fe 82 Si 4 B 10 P 4 metallic glass, which is certified by experimental results. Image 1 • The ability of losing electrons is increasingly weaker from V to Ni atoms. • While V, Cr, and Mn behave antiferromagnetically, magnetic moments of Co and Ni reduce. • The addition of X atoms weakens the saturation magnetic flux density of Fe 82 Si 4 B 10 P 4. • If Co with a minor proportion is added, it will enhance the magnetization of Fe 82 Si 4 B 10 P 4. [ABSTRACT FROM AUTHOR]

To satisfy the reliability and magnetic property requirements of surface mounted devices (SMD), the high-performance Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders were prepared by gas-water two-phase coupled rapid-setting sedimentation atomisation technology (WGC). They were compared with the Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders prepared by the traditional water-gas combined atomisation technology (W-G). The result shows that the morphology of the Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders prepared by the WGC device is better. The defects, such as burrs and protrusions on the surface of powder particles, were removed, and the formed powders were almost entirely spherical. Through x-ray diffraction (XRD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and vibrating sample magnetometer (VSM) analyses, we concluded that the Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 raw powder developed by the WGC device exhibited higher amorphousness and magnetic properties. Therefore, the novel WGC device exhibits a higher cooling capacity while preparing amorphous and nanocrystalline powders. It is also more suitable for the commercial production of amorphous and nanocrystalline powders. The magnetic properties of the powder were further evaluated by preparing them into a powder core. The powder developed by the WGC device with higher permeability can achieve similar direct current (DC) bias characteristics under higher permeability and lower core losses. These advantages of magnetic properties were pursued via SMD. [Display omitted] • The high-performance Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders were prepared by the gas-water two-phase coupled rapid-setting sedimentation atomization technology(WGC). • The WGC device is suitable for industrial production of amorphous and nanocrystalline powders • The Fe79Si8B13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders prepared by WGC device, which permeability can be increased more than 5%-10% under the same DC bias, and the core losses can reduced more than 20%. [ABSTRACT FROM AUTHOR]

To satisfy the reliability and magnetic property requirements of surface mounted devices (SMD), the high-performance Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders were prepared by gas-water two-phase coupled rapid-setting sedimentation atomisation technology (WGC). They were compared with the Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders prepared by the traditional water-gas combined atomisation technology (W-G). The result shows that the morphology of the Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders prepared by the WGC device is better. The defects, such as burrs and protrusions on the surface of powder particles, were removed, and the formed powders were almost entirely spherical. Through x-ray diffraction (XRD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and vibrating sample magnetometer (VSM) analyses, we concluded that the Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 raw powder developed by the WGC device exhibited higher amorphousness and magnetic properties. Therefore, the novel WGC device exhibits a higher cooling capacity while preparing amorphous and nanocrystalline powders. It is also more suitable for the commercial production of amorphous and nanocrystalline powders. The magnetic properties of the powder were further evaluated by preparing them into a powder core. The powder developed by the WGC device with higher permeability can achieve similar direct current (DC) bias characteristics under higher permeability and lower core losses. These advantages of magnetic properties were pursued via SMD. [Display omitted] • The high-performance Fe 79 Si 8 B 13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders were prepared by the gas-water two-phase coupled rapid-setting sedimentation atomization technology(WGC). • The WGC device is suitable for industrial production of amorphous and nanocrystalline powders • The Fe79Si8B13 and Fe 75 S 8 iB 13 Nb 3 Cu 1 powders prepared by WGC device, which permeability can be increased more than 5%-10% under the same DC bias, and the core losses can reduced more than 20%. [ABSTRACT FROM AUTHOR]

The structures of liquid Fe–C alloys in the Fe-rich end were investigated by ab initio molecular dynamics simulations. The trend of intensity of chemical short range order around Fe and C atoms changes at the eutectic composition, indicating the close correlation between liquid structure and phase diagram. The tri-capped trigonal prism (Voronoi index <0,3,6,0>) and mono-capped square archimedean antiprism (Voronoi index <0,4,4,0>) around C atoms have the largest frequency fractions and the longest lifetimes among all the polyhedra. Moreover, they tend to connect with each other to form network structure. The maximum intensity of network structure is located at the 20% C composition, which might be the reason why alloys near eutectic composition have great glass-forming ability. [ABSTRACT FROM AUTHOR]

Highlights: [•] Thermal stability of the FeSiBPNbCu alloys is strongly dependent on the Fe content. [•] The FeSiBPNbCu alloys with high Fe content exhibit good soft magnetic properties. [•] The coexistence of Cu, P and Nb leads to the excellent soft magnetic properties. [ABSTRACT FROM AUTHOR]