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Comptes Rendus Physique
Volume 15, n° 1S
pages e1-e5 (janvier 2014)
Doi : 10.1016/j.crhy.2013.10.002
A celebration of the pioneering work on quasicrystals in France and the expansion of crystallography
Des travaux pionniers sur les quasicristaux en France et l'expansion de la cristallographie
 

John Werner Cahn
 Department of Physics and Astronomy, University of Washington, Seattle, WA 98195-1560, USA 

Correspondence to: 116 Fairview Avenue North, Apartment 714, Seattle, WA 98109-5364, USA.
Abstract

The coincidence of a meeting at CECM/CNRS in 1985 to plan work on the newly discovered quasicrystals with a meeting at IHES on hyperspace crystallography greatly expanded crystallography and made France a major player in the opportunities provided by this discovery. Adherence to a paradigm which forbade possible symmetries for sharply diffracting solids discouraged US crystallographers from the field. Even though there were many earlier warnings and amendments to this false paradigm, it was considered by many to be a defining law of crystallography. By 1992, the International Union of Crystallography changed the definition of crystals to include quasicrystals. This definition still excludes many ordered structures, like a recently studied isotropic metallic structure that is as strongly ordered as a related intermetallic crystal.

The full text of this article is available in PDF format.
Résumé

La simultanéité d'une réunion au CECM/CNRS en 1985 planifiant le travail expérimental sur les quasicristaux nouvellement découverts et un atelier mathématique à l'IHES sur la cristallographie N -dimensionnelle a permis un développement des concepts de la cristallographie moderne et fait de la France l'un des acteurs majeurs du domaine. Concomitamment, aux États-Unis, les cristallographes se dissuadèrent d'aborder ce sujet du fait du paradigme interdisant certaines symétries aux solides présentant des diffractions ponctuées, qui était tenu par un grand nombre pour la loi fondamentale de la cristallographie, malgré de nombreux exemples et exceptions (non-stœchiométrie, phases incommensurables, etc.). En 1992, l'Union internationale de cristallographie changea la définition du cristal pour y inclure les quasicristaux. Cette définition exclut toujours de nombreuses structures ordonnées, telle une structure métallique isotrope récemment découverte, qui est aussi ordonnée que le cristal intermétallique dont elle dérive.

The full text of this article is available in PDF format.

Keywords : Crystals, Quasicrystals, Ordered solids, Isotropic solids, Glasses, Aperiodic tilings

Mots-clés : Cristaux, Quasicristaux, Solides ordonnés, Solides isotropes, Verres, Pavages apériodiques



 This online-only article belongs to the dossier Quasicrystals published in the preceding issue /
Cet article, disponible seulement en ligne, fait partie du dossier « Quasicristaux » publié dans le numéro précédent
(C. R. Physique 15 (1) (2014) 1–100).

1  This paper was revised and sent to Metall. Trans. [[1]].


© 2013  Published by Elsevier Masson SAS de la part de Académie des sciences.
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