The Stude Of The Fe-B Compoiunds Under High Temperature And High Press Conditions

The aim of this paper is using Fe powder, FeB powder and B powder as theexperimental raw material to seek a new structure of the Fe-B compound in the hightemperature and pressure conditions. In the experimental process, the experimentparameters such as the raw material stoichiometric ratio, holding time of samples, appliedpressure or temperature are being changed. The samples getting on the differentexperimental conditions were analysised to tell of the phase composition of thecomponent.Power Diffraction software of the Material Studio was used to optimize theprediction structure of FeB₂and FeB₄and simulate the corresponding X-Ray of eachcrystal structure.Fe powder and B powder were weighted according to the stoichiometric ratio1:2.2,the experiment pressure was set to2GPa, heat preservation time was set for1h, andtemperature was set517℃,1054℃,1591℃and2127℃in the experiment. X-RayDiffraction and Scanning Electron Microscope （SEM） was used to analysis the sample,and get FeB, FeB₄₉and unreacted B powder in the sample. The increasing proportion of Bpowder in the sample is conducive to the growth of the FeB₄₉, but no new phase of theFe-B compound was found in the sample.FeB powder and B powder were weighted according to the stoichiometric ratio1:1.5,the experiment pressure was set to5GPa, heating preservation time was set for30minutes and the sample heating temperature choosed1200℃,1650℃and1750℃. X-rayDiffraction and Scanning Electron Microscope （SEM） was used to analysis the samples,the sample under the condition of5GPa,1650℃contain the new phase FeB₄, its crystalstructure is the same as the oP10-FeB₄. The FeB and B stoichiometric ratio in the rawmaterial, heat preservation time and the pressure parameters were changed. The all ofsamples under different experimental conditions contain the new phase oP10-FeB₄. Theheating temperature and pressure play a decisive role on the formation of oP10-FeB₄.