X-ray photoelectron spectroscopy has been used to obtain surface composition and depth profiles of both ‘shiny’ and ‘dull’ sides of aged Fe75B20TM5 (TM ≡ Co, V) amorphous ribbons prepared by melt spinning. Thick oxide films are found on both sides of the two ribbons, the dull side being always much more oxidized. The composition of the oxide layers strongly depends upon the nature of TM. The outermost layer of the dull sides is invariably composed of iron oxides while, on the shiny surfaces, boron oxides are also detected, mixed with TM oxides only when TM ≡ V. Depth profiles obtained by sputtering revealed large oxygen-induced segregation phenomena. Cobalt, which does not participate actively in the formation of the passive layer, is depleted, whereas a large enrichment is found for vanadium which contributed to the layer mostly as VO2.
Surface Characterization of Fe75b20v5, Fe75b20co5 Amorphous Ribbons By X-ray Photoelectron-spectroscopy
GLISENTI, ANTONELLA;GRANOZZI, GAETANO;BERTONCELLO, RENZO;CASARIN, MAURIZIO;TONDELLO, EUGENIO
1990
Abstract
X-ray photoelectron spectroscopy has been used to obtain surface composition and depth profiles of both ‘shiny’ and ‘dull’ sides of aged Fe75B20TM5 (TM ≡ Co, V) amorphous ribbons prepared by melt spinning. Thick oxide films are found on both sides of the two ribbons, the dull side being always much more oxidized. The composition of the oxide layers strongly depends upon the nature of TM. The outermost layer of the dull sides is invariably composed of iron oxides while, on the shiny surfaces, boron oxides are also detected, mixed with TM oxides only when TM ≡ V. Depth profiles obtained by sputtering revealed large oxygen-induced segregation phenomena. Cobalt, which does not participate actively in the formation of the passive layer, is depleted, whereas a large enrichment is found for vanadium which contributed to the layer mostly as VO2.Pubblicazioni consigliate
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