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Dynamic segregation during ferrite oxidation revealed by XPS
Author(s) -
Domenichini B.,
AmilainBasset K.,
Bourgeois S.
Publication year - 2002
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1353
Subject(s) - x ray photoelectron spectroscopy , ferrite (magnet) , cationic polymerization , molybdenum , materials science , chemical engineering , metallurgy , chemistry , composite material , polymer chemistry , engineering
Dynamic segregation phenomena were revealed by XPS during the oxidation of some ferrites (Fe 2.5 Ti 0.5 O 4 , Fe 2.5 Ni 0.5 O 4 , Fe 2 CrO 4 and FeCr 2 O 4 ). This kind of phenomenon induces, at a low temperature (below room temperature), drastic changes in the cationic composition of the most external layers. Dynamic segregation is a function of the cationic composition, the oxidation capability and the morphology of these ferrites. Although dynamic segregation seems to be a quite frequent phenomenon that often can be observed during ferrite oxidation, there are materials in existence where it does not appear, such as molybdenum ferrite. Copyright © 2002 John Wiley & Sons, Ltd.