Electronic state of 57Fe Mössbauer probe atoms in Cu(III) oxides with perovskite and perovskite-related structures
BARANOV, Alexey
Chair of Radiochemistry, Department of Chemistry
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
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Chair of Radiochemistry, Department of Chemistry
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]
< Reduce
Chair of Radiochemistry, Department of Chemistry
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Language
en
Article de revue
This item was published in
Materials Chemistry and Physics. 2009, vol. 113, n° 1, p. 462-467
Elsevier
English Abstract
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 ...Read more >
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).Read less <
English Keywords
Oxides
Cu3+ oxides
High pressure synthesis
Perovskite structure
K2NiF4 structure
Mössbauer spectroscopy
Charge transfer phenomena
Origin
Hal imported