Eur. Phys. J. AP
Volume 4, Number 2, November 1998
|Page(s)||157 - 159|
|Published online||15 November 1998|
Surface composition analysis during the oxidation of ferrites: A necessity
Université de Bourgogne (LRRS, UMR 5613 CNRS),
9 avenue A. Savary,
BP 400, 21011 Dijon Cedex, France
Corresponding author: email@example.com
Revised: 6 July 1998
Accepted: 8 July 1998
Published online: 15 November 1998
The cationic composition of a titanium ferrite (Fe2.5Ti0.5O4) has been followed by XPS during its oxidation in cation deficient phases (without crystallographic transformation) in order to reveal a dynamic segregation phenomenon. Indeed, during this oxidation, an important modification of the chemical composition of the first layers of the material has been revealed: below 350 °C, the titanium ferrites surface becomes richer in iron and poorer in titanium. But, if the reaction is extended above 400 °C, some titanium can move to the surface. This phenomenon has been interpreted on the basis of the differences of mobility of the different ions which are present in the material. Finally, at 450 °C, on the surface of the spinel, the α–Fe2O3 phase begins to appear and hides the ferrite.
PACS: 66.30.-h – Diffusion in solids / 68.35.-p – Solid surfaces and solid solid interfaces
© EDP Sciences, 1998
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