Abstract
A small amount of other transition metals or rare-earths to binary iron-boron amorphous alloys causes significant changes in their physical properties. Knowledge of the electronic structure of these alloys is the key to understanding the dependence of mentioned changes of the physical properties on the additional element. X-ray Photoelectron spectroscopy (XPS) together with the structure of the valence band may get qualitative information about impurities on the surface and inside of samples. Core-level XPS spectra get also good information about the changes of surface composition during ion etching at cleaning alloy surfaces. The chapter reviews the electron spectroscopy studies of a large number of amorphous alloys, and emphasizes on the influence of T elements on valence bands and the changes of surface composition of Fe-T-B /T = Cr, W, Co, Pt, Ho/ materials. From the analysis of core-level energy shifts induced by T elements influences the possibility of the existence of another chemical state of boron in Fe-W-B and Fe-Cr-B materials than in the other samples.
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