The Synthesis And Characterization Of Fe And Si Compound By DC Arc Discharge Plasma

Because of their high melting point, low electronic resistivity and goods tability in high temperature, transition metal silicides are one of the most potential groups for applications in high-temperatue performance and electronics. Furthermore, nano-sized metal silicide coating can improve physical and chemical properties of the base materials. Therefore, researches on the synthesis of nanocrystalline metal silicides are becoming urgent and important.The Fe-Si system is one of the environmental-friendly materials because of their abundant existence on tne Earth's crust and no chemical pollution. There exist several compounds in the equilibrium phase diagram of the Fe-Si binary alloy.such as Fe2Si, Fe5Si3, FeSi, FeSi₂. Among these compounds, semiconducting orthorhombicβ-FeSi₂ has meny merits for the industrial applicatons due to excellent physical properties such as a direct band gap of 0.8-0.85eV and large optical absorption ang Seeback coeffieients.ε-FeSi is narrow-bandgap semiconductor with a cubic structure (apace group p213) that has been classified as a hybridization-bandgap semiconductor or Kondo insulator.It has attracted interest for over half a century, mainly because of its unusual magnetic behavior.In this paper, we take iron silica as research object. Using an effective synthesized method, direct current (DC) arc discharge plasma method, we synthesize Fe₃Si andε-FeSi nanoparticle. We use X-ray diffraction spectra and TEM picture character Fe₃Si,ε-FeSi andα-FeSi₂. The nanoparticle diameter is 10-30 nm. We also synthesize nanowire in the some method, but in different area. The nanowire diameter is about 10nm and length is 500nm-1μm. There are two nanopartical on the nanowire two sides. The last, we analyse the infact of discharge plasma method about gas pressure and electric current.