The Study Of Nd And B Doped Fe₃N Magnetic Nanomaterials

Aa a high-profile magnetic nanomaterial,Fe₃N possesses excellent physical properties,such as high hardness,high saturation magnetization,corrosion resistance and so on.However,the nitrogen source of synthetizing Fe₃N magnetic nanomaterials is poisonous and brings serious pollution,which restricts the development and application of the Fe₃N magnetic nanomaterials.Therefore,it is very important to explore a simple and feasible method for the synthesis of Fe₃N magnetic nanomaterials.What′s more,numerous studies have now shown the doping of the heteroatoms will make a great influence on the host materials,such as improving magnetic properties or bringing other new excellent performance to the host materials,and so on.In this paper,the single-phase Fe₃N、(Fe_1-xNd_x)₃N、Fe₃N_1-xB_x magnetic nanomaterials are synthesized via a simple way.The main contents of this paper are as follows:1.Through a simple and practicable method,Fe₃N magnetic nanomaterials were successfully obtained.Ethylenediamine was used instead of ammonia as nitrogen source to reduce pollutant emission,and the optimum conditions of synthesizing Fe₃N magnetic nanomaterials were determined.The results of the XRD showed the obtained product was single-phase Fe₃N magnetic nanomaterials with good crystallinity.The SEM and TEM results revealed the product has a regularly rod-like structure,and the Fe₃N nanoparticles are coated with a large number of amorphous carbon.EDS and XPS tests showed that the product is rich in carbon and nitrogen.VSM results indicated the product has high coercivity and remanence.2.In order to obtain Fe₃N magnetic nanomaterials with better magnetic properties,we prepared Nd³⁺doped Fe₃N magnetic nanomaterials with NdCl₃·6H₂O as dopant.After a large number of experiments,the maximum doping concentration of Nd³⁺was determined to be 5%.Based on a series of characterizations such as XRD,SEM,TEM,EDX and XPS,the structure and morphology of(Fe_1-xNd_x)₃N magnetic nanomaterial had been studied in detail,which proved that Nd³⁺was successfully incorporated into Fe₃N lattice.The results of the VSM revealed that the doping of the rare earth Nd³⁺increases the coercivity of the host material.The coercivity reaches the maximum when the doping concentration is 3%.3.To further expand the application of the Fe₃N magnetic nanomaterials,we prepared B doped Fe₃N magnetic nanomaterials with H₃BO₃ as dopant.After several experiments,we determined the maximum doping amounts of B are 20%.The characterizations of XRD,XPS and VSM proved that the B was successfully doped into the carbon layer and had an effect on the magnetic properties of the host material.The results of the TEM revealed the Fe₃N nanoparticles are coated with graphite carbon layer.In addition,the catalytic activity of Fe₃N_1-xB_x magnetic nanomaterials on HER under alkaline conditions was explored,showing a rather low overpotential of 216 mV and Tafel slope of 133 mV/dec when the doping concentration is 20%.