Surface composition analysis during the oxidation of ferrites: A necessity

Issue		Eur. Phys. J. Appl. Phys. Volume 4, Number 2, November 1998


Page(s)		157 - 159
DOI		10.1051/epjap:1998255

DOI: 10.1051/epjap:1998255

Eur. Phys. J. AP 4, 157-159

Surface composition analysis during the oxidation of ferrites:
A necessity

K. Basset - B. Domenichini - J. Merle - P. Perriat - S. Bourgeois

Université de Bourgogne, 9 avenue A. Savary, BP 400, 21011 Dijon Cedex, France

Received: 14 April 1998 / Revised: 6 July 1998 / Accepted: 8 July 1998

Abstract
The cationic composition of a titanium ferrite (Fe_2.5Ti_0.5O₄) 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 $350~{^\circ{\rm C}}$ , the titanium ferrites surface becomes richer in iron and poorer in titanium. But, if the reaction is extended above $400~{^\circ{\rm C}}$ , 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 $450~{^\circ{\rm C}}$ , on the surface of the spinel, the $\alpha$ -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

Author for correspondance: byhan@satie.u-bourgogne.fr

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