Study On The Controllable Preparation And Performance Of α-Fe₂O₃ Nano-particles

In this paper, the developed history and representative methods of magnetic nanometersparticles were introduced ae well as α-Fe₂O₃ nano-particles. Nano-sized α-Fe₂O₃ powderswere firstly prepared by microwave radiation combining high temperature sintering. Duringthe preparation of α-Fe₂O₃ nano-particles, the effects of microwave radiation on dispersionand particle sizes was studied;At the same time, the effects of different gowth-regulatings onpatterns and dispersibility of nano-particles were discussed. At last, the powders werecharacterazied. (一),The α-Fe₂O₃ nano-particles were separately prepared by Sol-Gel method andmicrowave radiation method. The effects of two preparations methods on the performance ofnano-particles were discussed. (二),The advantages and feasibility of microwave radiation method were confirmed bycomparing and contrasting without microwave radiation. The study of the gowth-regulatingsin reaction liquid and reaction conditions exhibited that good sensitivity and small particlesize of spheral,diamond and clubbed α-Fe₂O₃ nano-particles were obtained by microwave-assistant synthesis method. In order to obtain good sensitivity, the effects of the mol ratio ofinitial solution FeCl3 and gowth-regulatings,ageing stage,calcination temperature and calcina-tion time on the patterns and the sensitivity of the powders were studied. Investigations of inf-rared spectrum(IR) analysis,X-ray diffracton(XRD),and transmission electron microscopy(TEM), the reaction mechanism and the optimal reaction conditions were revealed.(三),Under the best preparation condition, the different patterns of α-Fe2O3 nano-particleswere successfully obtained. The formation process and crystal structure were characterized byTEM,IR,XRD respectively. The specific area and magnetic performance were characterizedand studied.