Achieving integrated soft magnetic-catalytic functionalities in Fe-based amorphous ribbons via glassy matrix and self-spalling oxide layer

This study comprehensively explores the correlation between microstructural evolution/surface characteristics and the dual functional performance of soft magnetism and catalytic degradation in Fe-based amorphous alloys. The magnetic properties and methyl orange (MO) degradation performance of as-spun Fe₈₀P₅C_{15− x} B _x ribbons ( x = 0 and 10), produced at various roller speeds ( R _s) ranging from 10 to 45 s⁻¹, were carefully analyzed. The soft magnetic properties and MO degradation performance of the ribbons are synergistically enhanced with increasing R _s and boron (B) doping. This enhancement can be ascribed to matrix modification, specifically the formation of the Fe₂₃(C,B)₆ crystalline phase and a fully glassy phase, along with the formation of a self-spalling oxide layer on the surface. Specifically, the kinetic rate constant ( k ) for all ribbons shows a clear positive correlation with both saturation magnetization ( B _s) and logarithmic magnetic permeability at the frequency of 1000 kHz (ln μ _hf), highlighting the role of magnetic-catalytic synergy in accelerating the reaction rate. This work presents a novel strategy for designing Fe-based amorphous alloys with integrated soft magnetic and catalytic functionalities, offering promising potential for application in reusable wastewater treatment systems.