PRESNIAKOV, Igor; DEMAZEAU, Gérard; BARANOV, Alexey; SOBOLEV, Alexey; GUBAIDULINA, Tatyana V.; RUSAKOV, Viyacheslav S.; VASILIEV, Alexander

doi:10.1016/j.matchemphys.2008.07.116

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

PRESNIAKOV, Igor
Chair of Radiochemistry, Department of Chemistry

DEMAZEAU, Gérard
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BARANOV, Alexey
Chair of Radiochemistry, Department of Chemistry
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

Langue

Article de revue

Ce document a été publié dans

Materials Chemistry and Physics. 2009, vol. 113, n° 1, p. 462-467

Elsevier

Résumé en anglais

Mössbauer spectroscopy studies were developed in order to obtain an evaluation of different physico-chemical factors characterizing the electronic structure of the local sites (CuO6) into three copper(III) oxides: LaCuO3 having a three-dimensional (3D) perovskite structure; SrLaCuO4 and La2Li0.50Cu0.50O4 with a two-dimensional (2D) K2NiF4-type structure. All these matrixes have been doped with 57Fe (1 at.%) Mössbauer probe atoms. Such evaluation was based on analysis of the 57Fe Mössbauer parameters (isomer shift and quadrupole splitting) characterizing the formal oxidation state and the local structure of the 57Fe probe atoms. The obtained results underline that four main factors play an important role in the stabilization of formally trivalent “Cu3+” ions: (i) the involved preparation process (in particular the oxygen pressure level able to impede the formation of oxygen vacancies); (ii) the dimensionality (3D or 2D) of the lattice; (iii) the chemical surrounding and (iv) the local structural distortion of the transition metal site (CuO6), both last factors governing the local crystal field energy, orbital ordering and a possible charge transfer Cu3+–O2− ↔ Cu2+–O−(L).< Réduire

Mots clés en anglais

Oxides

Cu3+ oxides

High pressure synthesis

Perovskite structure

K2NiF4 structure

Mössbauer spectroscopy

Charge transfer phenomena

Métadonnées

Licence d’utilisation du document

Electronic state of 57Fe Mössbauer probe atoms in Cu(III) oxides with perovskite and perovskite-related structures

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche