【摘要】 本研究将强磁场引入到湿化学法中,合成高有序度的FePtCu纳米粒子。研究表明:磁场下制备的FePtCu纳米粒子呈球形,形貌、尺寸均一,分散度较好。随着磁场强度的增加,FePtCu纳米粒子的尺寸增加,有序度（s）和矫顽力逐渐增加。在6 T强磁场下,获得了尺寸约为11.21 nm,s为0.8985的L1₀-FePtCu纳米粒子。强磁场对粒子的磁化作用造成晶格应变,导致空位或缺陷形成,从而有效加速Fe和Pt原子的有序化扩散,促进了FePt纳米粒子的无序-有序转化。强磁场辅助可实现对有序结构的调控,该方法为直接制备L1₀结构纳米材料提供了一种新思路。更多还原

【Abstract】 High magnetic fields （HMF） can pass high intensity energies to the atomic scale of materials without contact to change the thermodynamic state of materials,and affect the arrangement,matching and migration of atoms and molecules.Therefore,in th is work,HMF was introduced into wet-chemical synthesis to prepare FePtCu nanoparticles （NPs）.The results show that the FePtCu NPs with L1 ₀structure,uniform morphology,and good dispersibility were successfully prepared under HMF.With the increase of magnetic field,the size FePtCu NPs increases,and the ordering degree （s） and the coercivity gradually increase.The L1₀-FePtCu NPs with sizes of about11.21 nm and ordering degree of 0.8985 are obtained under the HMF of 6 T.The maghrtization of particle by HMF causes lattice distortions and leads to the formation of vacancies or defects in the FePt NPs,which effectively accelerate the orderly diffusion of Fe and Pt atoms and promotes the disordered-ordered transformation of the FePt NPs.Therefore,HMF assistance can accomplish the regulation of ordered structure.This method provides a new path for the direct synthesis of L1₀ structured nanomaterial’s.更多还原