Research On The Direct Synthesis Fct-phase FePt By The Doping Of Element Ag

This thesis mainly focuses on the studies of avoiding agglomeration caused by the post-annealing when we transform fcc-phase FePt to fct-phase FePt; Compared to the traditional two-step chemical method, sliver was firstly taken advantage to the one-step synthesis. Platinum acelacetonate,Iron acelacetonate and sliver acetic acid act as precursors;1,2-hexadecanedial serves as reduction in the solution hexadecylamine;All the reactions were taken place in four-necks-round-bottom flask under the Nitrogen to prevent against oxidation.Firstly,in order to control the degree of the phase transformation and magnetism; we keep1.1:1as the constant of the ratio of Fe-precursor to Pt-precursor,and modify the content of Ag-precursor; Here atom Ag was successful used to assistant the one-step synthesizing fct-phase FePt. As to the ratio (Fe52Pt48):Ag=5:3,the coercivity can reach as high as4700Oe This was the first time Ag play a role as good as Au.Secondly,we keep the ratio Pt-precursor to Ag-precursor as5:4in constant, and modify the content of Fe-precursor.. The degree of phase transition and magnetism was discussed. When it comes to the ratio Fe:(Pt55Ag45)=5:5,the coercivity can reach as amazing7572Oe! This maybe the largest one in adulterant-assistant one-step synthesis fct-phase FePt which the previous article have reported.The value is as good as the samples which annealed at the temperature higher than550centigrade.Thirdly, different kinds of dopant such as Cu and the light weight atom Li were harnessed to assistant the phase-transition of FePt. Seen from the control groups,Ag was proved to be the most effective dopant. And different kinds of high-temperature solution were studies. We can conclude from them that the effect of different solution was similar and nanoparticle FePt can best disperse in hexadecylamine.In sum, we can conclude that Ag can play a satisfactory role in one-step synthesis fct-phase Fept...