Author/Authors :
Vondr??ek، نويسنده , , M. and Dudr، نويسنده , , V. and Tsud، نويسنده , , N. and Lej?ek، نويسنده , , P. and Ch?b، نويسنده , , V. and Prince، نويسنده , , K.C. and Matol?n، نويسنده , , V. and Schneeweiss، نويسنده , , O.، نويسنده ,
Abstract :
The surface segregation of a Fe94Si6 and Fe76Si24 alloys was studied using high resolution photoemission spectroscopy with synchrotron radiation at 150–166 eV photon beam energy. During Ar+ ion sputtering and following heat treatment, a SiO2 layer and segregation of Si atoms in three clearly resolved phases occurred. This indicates formation of silicides, mainly Fe3Si and cubic FeSi superstructures. The photoemission measurements were complemented by 57Fe Mössbauer spectroscopy in different modes which gave information about deeper surface layers (approximately 10–30 000 nm) of the samples. The results derived from the Mössbauer spectra support the conclusions concerning phase composition of the surface deduced from photoemission spectroscopy.
Keywords :
Fe–Si alloy , photoemission spectroscopy , Segregation , M?ssbauer spectroscopy , surface
