Titre du document / Document title

Electronic structure of Ag²Cu²O⁴. Evidence of oxidized silver and copper and internal charge delocalization

Auteur(s) / Author(s)

MUNOZ-ROJAS D. ; SUBIAS G. ; FRAXEDAS J. ; GOMEZ-ROMERO P. ; CASAN-PASTOR N. ;

Résumé / Abstract

The electronic structure of the recently isolated silver copper oxide Ag²Cu²O⁴ is analyzed along with its precursor Ag²Cu²O³ and similar binary oxides, Ag²O, AgO, CuO, and NaCuO², using X-ray photoemission (XPS) and X-ray absorption (XAS) measurements. The results for Ag²Cu²O⁴ reveal an electronic distribution in which silver and copper share a delocalized valence scheme with both metals in formal oxidation states larger than the usual Ag₁ and Cull. Only one type of crystallographic silver or copper is found, but disorder-strain parameters are considerable and the possibilities of thermal disorder, atomic motion, oxygen contribution, mixed valence, and internal charge delocalization are considered. Classical coordination descriptions for oxidized silver are revisited in terms of this new internal charge delocalization framework found for the electronic structure.

Revue / Journal Title

The journal of physical chemistry. B   ISSN 1520-6106 

Source / Source

2005, vol. 109, n^o13, pp. 6193-6203 [11 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

American Chemical Society, Washington, DC, ETATS-UNIS  (1997) (Revue)

Localisation / Location

INIST-CNRS, Cote INIST : 549 B, 35400012714615.0250