Microsc. Microanal. Microstruct. 5, 79-90 (1994)
DOI: 10.1051/mmm:019940050207900

Valence of manganese, in a new oxybromide compound, determined by means of electron energy loss spectroscopy

J.L. Mansot¹, P. Leone², P. Euzen² et P. Palvadeau<sup>2

1</sup>  Laboratoire de Physique Cristalline, Institut des Matériaux de Nantes, 2 rue de la Houssinière, 44072 Nantes cedex 03, France
²  Laboratoire de Chimie du Solide, Institut des Matériaux de Nantes, 2 rue de la Houssinière, 44072 Nantes cedex 03, France

Abstract
Electron Energy Loss Spectroscopy, at Mn M2,3 and L2,3 edges is used in order to investigate the ionization state of manganese in a new oxybromide compound. The experimental procedure and the various approaches used to determine Mn oxidation state (edge energy shifts and L3/L2 ratios) are tested on a wellknown manganese oxychloride containing Mn2+ and Mn3+ cations. The comparison of the respective confidence limits of each approach shows that the best precision is obtained with the method based on the energy shifts of the Mn L2,3 edges. That experimental approach applied to the manganese oxybromide allows us to confirm that Mn 4+ is present in this new compound and a reconstruction of the L2,3 white lines, using normalized standard spectra, seems to show the presence of three Mn oxidation states in the material.

PACS
7920U - Electron energy loss spectroscopy.
7120P - Other inorganic compounds.

Key words
Valence -- EEL spectroscopy -- Experimental study -- Deconvolution -- Mixed-valence compounds -- Simulation -- Oxybromides -- Manganese compounds -- Ternary compounds -- Electronic properties -- Condensed matter physics -- Materials science -- Physics -- Impact phenomena -- Electron states -- Condensed state physics -- Inorganic compounds -- Transition element compounds


© EDP Sciences 1994