Study Of Transition Metals Doped Iron Nitride Magnetic Nanomaterials

Recently,iron nitride material gets wide attention for their admirable magnetic properties as well as potential applications in many areas.Thereinto,it is found that ?-Fe3 N and ??-Fe4 N have potential applications as magnetic fluid,contrast agent and catalysts,due to their room temperature ferromagnetism,good stability as well as metal behavior.However,monotonous synthetic method has restricted their further research and application.Thus,it is crucial to explore a simple and novel way to obtain the ?-Fe3 N and ??-Fe4 N material and expand their applications.According to previous research,we synthesized the ?-Fe3 N magnetic materials by a simple route.Moreover,we obtained the transition metal(Ni,Mn and Co)doped ?-Fe3 N materials and investigated properties of the prepared materials.In addition,we tried to prepare ??-Fe4 N magnetic material.The main content works of this paper are as follows:1.Precursors were prepared by three different organic amines.And the different ?-Fe3 N magnetic materials was obtained by calcining different precursors.Firstly,we proposed phase transfer process occurred in the reaction by adjusting the calcining conditions and consulting previous studies.Secondly,we investigated the morphology of different ?-Fe3 N materials by transmission electron microscope.Finally,we investigated the magnetic properties.The results indicated that different materials prepared by different precursors have similar phase transfer process,but temperature range of phase transfer process was different.Thus,the ?-Fe3 N magnetic materials prepared by different precursors have different properties.2.Ni,Mn,and Co doped ?-Fe3 N materials was obtained by ethylenediamine complexation.And we explore effect of Ni,Mn and Co doping on the structure,morphology and magnetic properties of ?-Fe3 N.The results indicated that the incorporation of Ni and Mn has a slight impact on the structure.But the incorporation of Co reduced the stability of Fe3 N and led to early occurrence of the phase transfer process.Moreover,the incorporation of Ni and Mn exert a significant influence on morphology of ?-Fe3 N.3.The structure,morphology and magnetic properties of ?-Fe3 N,?-(Fe1-x Nix)3N and(Fe1-x Mnx)3N was carefully compared.We found the incorporation of Mn also reduced the stability of Fe3 N by calculation and comparison of lattice parameters.Moreover,the incorporation of Mn and Ni reduced the magnetic properties of ?-Fe3 N.This should be the main reason for the change of morphology.4.Precursors were prepared by hexamethylenetetramine.The ??-Fe4N/Fe3 C composite material were prepared by calcining and nitridation of precursors,and the properties of material was carefully investigated.Moreover,?-Fe3 C and ?-Fe5C2 were obtained by change of the calcining conditions and the amount of ethylenediamine.Through the study of magnetic properties of materials,we found both ??-Fe4N/Fe3 C composite material and prepared iron carbide materials had high saturation magnetization.5.Finally,we explored potential application of prepared samples.Firstly,we investigated photocatalytic properties of ?-Fe3 N and ?-(Fe1-x Nix)3N materials.The results indicated that ?-(Fe1-x Nix)3N materials have relatively higher catalytic performance.Secondly,we investigated catalytic activity of oxygen evolution reaction of ??-Fe4N/Fe3 C composite material.The results demonstrated that the composite material has potential as a catalyst for low-cost oxygen evolution.