Composition and orientation dependence of the O K and Fe L<SUB>2,3</SUB> EELS fine structures in Ca<SUB>2</SUB>(Al<SUB>x</SUB>Fe<SUB>1-x</SUB>)<SUB>2</SUB>O<SUB>5</SUB> - Archive ouverte HAL Access content directly
Journal Articles Physical Review B Year : 2000

Composition and orientation dependence of the O K and Fe L2,3 EELS fine structures in Ca2(AlxFe1-x)2O5

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Abstract

Oxygen K edge and iron L2,3 edges electron-energy-loss spectra have been collected on brownmillerites [Ca2(Alx,Fe1-x)2O5] synthesized with different Al/Fe compositions (02,3 edges in these compounds has been evaluated together with its possible influence on the determination of the Fe 3d-band occupation. These results have been used as a reference for the study of the Fe 2p spectra in Si and Ti substituted brownmillerites, which are present on a nanometer scale in cements. They demonstrate that substitution by tetravalent cations into brownmillerite is not accompanied by a significant reduction of the valence of the iron atoms. This suggests that charge compensations operate through the increase of oxygen content in the structure.
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insu-03642936 , version 1 (17-09-2022)

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A. Gloter, J. Ingrin, D. Bouchet, C. Colliex. Composition and orientation dependence of the O K and Fe L2,3 EELS fine structures in Ca2(AlxFe1-x)2O5. Physical Review B, 2000, 61, pp.2587-2594. ⟨10.1103/PhysRevB.61.2587⟩. ⟨insu-03642936⟩
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