Thermal stability, crystallization, and magnetic properties of FeNiBCuNb alloys*

Abstract

Amorphous (Fe40Ni40B19Cu1)100−x Nb x (x = 1, 3, 5, 7) ribbons are prepared by using the melt-spinning method. We find that the glass forming ability (GFA) of the as-melt spun ribbons is significantly improved by adding Nb element. In addition, the thermal stability evaluated in steps of Δ T = T x 2 − T x 1 effectively increases from 16 K to 75 K with Nb content increasing. The as-melt spun (Fe40Ni40B19Cu1)97Nb3 ribbon exhibits a lowest coercivity of 2 A/m and relatively large saturation magnetization of 103.7 A · m 2 / kg and thus it can be further treated by being annealed at 809 K. The crystallization behavior is confirmed to be determined by two individual crystallization processes corresponding to the precipitation of (Fe,Ni)23B6 phase and γ-(Fe,Ni) phase. With increasing annealing time, the single (Fe,Ni)23B6 phase can be transformed into a mixture of (Fe,Ni)23B6 and γ-(Fe,Ni) phase, and the grain size of γ-(Fe, Ni) phase increases from 5 nm to 80 nm while the grain size of (Fe,Ni)23B6 remains almost unchanged. Finally, we find that the grain growth in each of (Fe,Ni)23B6 and γ-(Fe, Ni) deteriorates the overall magnetic properties.

Gd impurity effect on the magnetic and electronic properties of hexagonal Sr ferrites: A case study by DFT

“…[16][17][18] Studies on garnet and perovskites and other magnetic nano-particles have also shown that doping the above elements has a significant effect on their thermal stability, crystallization, physical, magnetic, and optical properties. [19][20][21][22] The carrier doping positive effects on the magnetic properties of defective graphene have been detected. [23] Using firstprinciple calculations, researchers have investigated the mechanical, structural, and electronic properties and formation energy of 25 kinds of III-V binary monolayers in detail.…”

The Non-Isothermal and Isothermal Crystallization Behavior and Mechanism of Fe–Ni Alloys

“…In our previous study, we prepared amorphous alloys with Nb content of 1%, 3%, 5%, and 7%. The results showed that the comprehensive soft magnetic properties of the alloy with 3% Nb are the best with coercivity of 2 A/m and saturation magnetization of 103.7 A·m 2 /kg.…”

“…15 known KJMA model can be easily determined to aid understanding of the nucleation and growth mechanism in various crystallization stages. 16−19 In our previous study, 20 we prepared amorphous alloys with Nb content of 1%, 3%, 5%, and 7%. The results showed that the comprehensive soft magnetic properties of the alloy with 3% Nb are the best with coercivity of 2 A/m and saturation magnetization of 103.7 A•m 2 /kg.…”