Preparation Of Fe-based Amorphous Nanoparticles And Soft Magnetic Properties

Amorphous nanoparticles are promising for medical,wave absorbing and wastewater treatment applications due to their structural properties and excellent soft magnetic properties.Fe-based amorphous nanoparticles are simple to prepare,have excellent properties and good soft magnetic properties without doping with precious metals.The preparation of Fe-based amorphous nanoparticles with excellent soft magnetic properties and uniform particle size has become a current research hotspot.In this paper,by adjusting the ratio of BH₄^-and H₂PO₂^-two ions to change the molar concentration ratio of non-metallic elements B and P in the liquid environment,FeBP amorphous nanoparticles with uniform particle size were prepared.The microstructure and properties of the samples were determined by XRD,SEM,DSC,VSM,and other means,and FeBP and FeB amorphous particles were annealed,and the effects of annealing time and temperature on the amorphous particles were studied.Influence of particle microstructure on the soft magnetic properties.Then,with the help of solid and molecular empirical electron theory（EET theory）and the crystallite model of amorphous alloys,the valence electronic structure parameters of amorphous alloys were calculated by the BLD method and compared with the measured values.The relationship between structure and performance.The research results are as follows:1.The results showed that the samples were all amorphous,the particle size was less than 100 nm,and the amorphous particles prepared had excellent soft magnetic properties when the molar concentration ratio of B and P in the liquid phase environment was 2:3,the saturation magnetization strength could reach 123 emu/g,and the coercivity was only 20 Oe.2.FeBP and FeB amorphous particles were annealed at different times and temperatures,and the amorphous particles showed partial crystallization after annealing.The saturation magnetization and coercivity of the two amorphous particles showed an increasing trend,among which the soft magnetic properties of FeBP amorphous particles significantly increased after annealing at 380℃ for 30 minutes,and the saturation magnetization increased without significant change in coercivity.3.The magnetic moment of FeBP amorphous alloy prepared with the molar concentration ratio of B and P in the liquid phase environment was 125.69 emu/g,and the error between the result and the experimental measurement result was 2.2%,which met the first-level approximation conditions.The magnetic calculation of amorphous alloys is realized at the level of valence electronic structure,which has certain theoretical guiding significance for the optimization of soft magnetic properties and composition of amorphous alloys.