XPS and XAS analysis of surface chemical states of -FeSi single crystals

Esaka, Fumitaka  ; Yamamoto, Hiroyuki; Udono, Haruhiko*; Matsubayashi, Nobuyuki*; Yamaguchi, Kenji; Shamoto, Shinichi  ; Magara, Masaaki  ; Kimura, Takaumi 

Chemical states of solid surface were investigated by a combination of energy-tunable X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. The analysis was performed for the -phase and -phase iron silicide single crystals. The result reveals that Si-rich and Fe-rich structures exist in the -phase single crystal. Depth profiling also indicates that the Fe-rich structure is located in the surface region, while the Si-rich structure exists in the deeper region. In conclusion, this analytical technique is a powerful tool for solid samples such as nuclear materials and fuels.