D
Denis Gratias
Researcher at Centre national de la recherche scientifique
Publications - 80
Citations - 9627
Denis Gratias is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Quasicrystal & Icosahedral symmetry. The author has an hindex of 29, co-authored 79 publications receiving 9082 citations. Previous affiliations of Denis Gratias include Chimie ParisTech.
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Metallic Phase with Long-Range Orientational Order and No Translational Symmetry
TL;DR: In this article, a metallic solid with long-range orientational order, but with icosahedral point group symmetry, which is inconsistent with lattice translations, was observed and its diffraction spots are as sharp as those of crystals but cannot be indexed to any Bravais lattice.
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Generalized cluster description of multicomponent systems
TL;DR: A general formalism for the description of configurational cluster functions in multicomponent systems is developed and a new interpretation of the Cluster Variation Method as a self-consistency relation on the renormalized cluster energies is presented.
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Indexing of icosahedral quasiperiodic crystals
TL;DR: In this article, the extinction rules for three of the five icosahedral Bravais quasilattices are compared, and some simple relationships with the six-dimensional cut and projection crystallography are derived.
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Neutron-diffraction study of icosahedral Al-Cu-Fe single quasicrystals.
TL;DR: La structure a un groupe d'hyperespace F⊗m35 est definie par les trois surfaces atomiques situees a des points speciaux avec une symetrie icosaedrique entiere du reseau F.
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Icosahedral AlCuFe alloys : towards ideal quasicrystals
TL;DR: In this paper, the topological and chemical long range orders in the icosahedral Al 65 Cu 20 Fe 15 alloy have been studied by X-ray powder diffraction and quantitatively measured showing that the final annealed product fits the theoretical predictions of the ideal quasicrystal model within the instrument resolution.