EL OMARI, Malika; EL OMARI, Mohamed; ABAOUZ, A.; YACOUBI, A.; RÉAU, Jean-Maurice; SÉNÉGAS, Jean

doi:10.1016/S0167-577X(01)00462-1

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

EL OMARI, Malika
Department of Chemistry, Faculty of Science

EL OMARI, Mohamed
Department of Chemistry, Faculty of Science

ABAOUZ, A.
Department of Chemistry, Faculty of Science

Langue

Article de revue

Ce document a été publié dans

Materials Letters. 2002, vol. 53, n° 3, p. 138-144

Elsevier

Résumé en anglais

The F− diffusion processes within the anion-excess solid solution Na1−xBixF1+2x with fluorite-type structure have been studied by 19F-NMR investigation. Two types of fluoride ions, Fn and F′, are distinguished in the 19F-NMR spectra of rigid lattice at low temperature (T=175 K) and the distribution of fluoride ions among the two sites is determined by deconvolution of the experimental spectra. The short-range order in these materials is analogous to the clustering process observed in the K1−xBixF1+2x solid solution. It corresponds to an order between cubic entities and cubooctaedral clusters. Two diffusion mechanisms are identified on both sides of a Tr temperature. The first one at TTr to an F− exchange between cubic and cubooctaedral clusters.< Réduire

Mots clés en anglais

Diffusion

NMR

Fluorite-type structure

Clustering

Métadonnées

Licence d’utilisation du document

Short-range order and diffusion processes in the Na1-xBixF1+2x anion-excess solid solution

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche