Stabilization of highest-oxidation states of transition metals and the induced electronic phenomena in oxidic perovskite structures
Langue
en
Article de revue
Ce document a été publié dans
Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie. 2005, vol. 631, n° 2-3, p. 556-563
Wiley-VCH Verlag
Résumé en anglais
In oxides the stabilization of the highest oxidation states n+ of transition metals leads to the stabilization of strong covalent Mn+-O bonds. Such very covalent bonds can induce electronic phenomena as spin transitions ...Lire la suite >
In oxides the stabilization of the highest oxidation states n+ of transition metals leads to the stabilization of strong covalent Mn+-O bonds. Such very covalent bonds can induce electronic phenomena as spin transitions through the increase of the local crystal-field energy (Dq) or in the specific case of an anisotropic eg1 electronic configuration some strong interactions with the perovskite structure (3D character, structural distortion) can lead to a insulatormetal transition or a disproportionation phenomenon. [2Mn+(M(n - )+)+(M(n+)+)] In order to illustrate such a topic, three unusual oxidation states have been selected: Co3+(d6), Fe4+(d4) and Ni3+(d7) in perovskite-type structures.< Réduire
Mots clés en anglais
High oxidation states
Transition metal cations
Electronic phenomena
Spin transition
Insulator metal transition
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