The role of P in the nanocrystallization of a newly developed Fe-based Fe85Si2B8P4Cu1 soft magnet (NANOMET) is investigated by differential scanning calorimetry (DSC), high-energy X-ray diffraction (XRD), and transmission electron microscope. DSC results show that addition of P into Fe85Si2B8P4Cu1 retards growth of α-Fe precipitates and also hinders the onset of crystallization of the residual amorphous phase. High-energy XRD results indicate that a lattice parameter of the precipitated α-Fe is 2.86652 A, which is very close to that of pure bcc Fe. A small amount of P and/or Si, however, are resolved in nanocrystalline Fe, which causes Curie temperature (TC) of the precipitated α-Fe to decrease by ΔTC = 31 K lower than the value of pure bcc Fe. With increase in the volume fraction of the precipitated α-Fe, the concentration of residual amorphous becomes close to that of the most stable amorphous alloy, i.e., Fe76Si9B10P5 when the volume fraction approaches to 40%. P in NANOMET contributes to hinder the formation of Fe-B(Si,P) compounds by stabilizing residual amorphous phase.
- Amorphous magnetic materials
- Soft magnetic materials
- X-ray scattering
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering