Free Access
Issue
Microsc. Microanal. Microstruct.
Volume 1, Number 1, February 1990
Page(s) 41 - 53
DOI https://doi.org/10.1051/mmm:019900010104100
Microsc. Microanal. Microstruct. 1, 41-53 (1990)
DOI: 10.1051/mmm:019900010104100

Ordering phenomena in the diphosphate tungsten bronzes with hexagonal tunnels : Ba (P2O4)2 (WO3)2m

Bernadette Domengès, Maryvonne Hervieu et Bernard Raveau

Laboratoire de Cristallographie et Sciences des Matériaux (CRISMAT), ISMRa, Boulevard du Maréchal Juin, 14032 Caen Cedex, France


Abstract
Superstructure phenomena in the barium diphosphate tungsten bronzes with hexagonal tunnels, Ba (P2O4)2 (WO3 )2m , are characterized by electron diffraction and high resolution electron microscopy. A model of superstructure is deduced from the observations and used to perform image calculations. The comparison of experimental and calculated images allows to associate the superstructure phenomena to orderings of the barium cations in the hexagonal tunnels.


Résumé
Les phénomènes de surstructure dans les bronzes diphosphates de tungstène à tunnels hexagonaux au baryum, Ba (P2O4)2 (WO3)2m , sont caractérisés par diffraction électronique et microscopie électronique haute résolution. Un modèle de surstructure est déduit des observations et utilisé dans les calculs de simulation d'images. La comparaison des images expérimentales et calculées permet d'associer aux phénomènes de surstructure, des mises en ordre des cations baryum dans les tunnels de section hexagonale.

PACS
6166F - Inorganic compounds.

Key words
Ordering -- Superstructure -- Crystalline structure -- Electron diffraction -- Electron microscopy -- Theoretical model -- Imagery -- Structure of liquids -- Structure of solids -- Crystallography -- Condensed matter physics -- Materials science -- Physics -- Solid physics -- Cristallography


© EDP Sciences 1990

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