Denis Gratias

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Denis Gratias

Denis Gratias (born September 22, 1947 in Paris ) is a French physicist and crystallographer . He is one of the pioneers of quasicrystals .

Gratias attended the Lycée Janson de Sally in Paris, studied at the École nationale supérieure de chimie de Paris (ENSCP) from 1967 to 1970 and received his doctorate there in 1978 with a dissertation on crystallography (Cristallographie des interfaces dans les cristaux homogènes). As a post-doctoral student he was at the University of California, Berkeley , at the Center d'Études de Chimie Métallurgique (CECM) in Vitry-sur-Seine and at the University of California, Santa Barbara , with John W. Cahn . During this time, the discovery of quasicrystals by Dan Shechtman (1982) fell, which also became the main research area of ​​Gratias. On his return he worked again at the CECM in close collaboration with the Center for Theoretical Physics of the École polytechnique . In 2000 he moved to the Laboratoire d'étude des microstructures (LEM) of CNRS and ONERA in Châtillon . He is the research director of the CNRS. He lives in Sceaux .

From 1991 to 2002 he taught as Chargé de Cours (professor) at the École Polytechnique and from 1997 to 2005 at the ENSCP.

In 1999 he received the Prix ​​Jean Ricard and in 1994 the silver medal of the CNRS. In 1994 he became a corresponding member of the Académie des sciences .

Fonts

  • with Richard Portier: Time-like perturbation method in high-energy electron diffraction. In: Acta Crystallographica . Section A: Foundations of Crystallography. Volume 39, No. 4, 1983, pp. 576-584, doi : 10.1107 / S0108767383001105 .
  • with Juan M. Sanchez, François Ducastelle: Generalized cluster description of multicomponent systems. In: Physica . A: Statistical Mechanics and its Applications. Volume 128, No. 1/2, 1984, pp. 334-350, doi : 10.1016 / 0378-4371 (84) 90096-7 .
  • with Dan Shechtman , Ilan Blech, John W. Cahn : Metallic phase with long-range orientational order and no translational symmetry. In: Physical Review Letters . Volume 53, No. 20, 1984, pp. 1951-1953, doi : 10.1103 / PhysRevLett . 53.1951 .
  • with John W. Cahn, Dan Shechtman: Indexing of icosahedral quasiperiodic crystals. In: Journal of Materials Research. Volume 1, No. 1, 1986, pp. 13-26, doi : 10.1557 / JMR.1986.0013 .
  • with Marianne Cornier-Quiquandon, Annick Quivy, S. Lefebvre, Erik Elkaim, Gernot Heger , André Katz: Neutron-diffraction study of icosahedral Al-Cu-Fe single quasicrystals. In: Physical Review. B: Covering Condensed Matter and Materials Physics. Volume 44, No. 5, 1991, pp. 2071-2084, doi : 10.1103 / PhysRevB.44.2071 .
  • with Yvonne Calvayrac, Annick Quivy, M. Bessière, S. Lefebvre, Marianne Cornier-Quiquandon: Icosahedral AlCuFe alloys: towards ideal quasicrystals. In: Journal de Physique. Volume 51, No. 5, 1990, pp. 417-431, doi : 10.1051 / jphys: 01990005105041700 .
  • with Françoise Faudot, Annick Quivy, Yvonne Calvayrac, M. Harmelin: About the Al – Cu – Fe icosahedral phase formation. In: Materials Science and Engineering. A: Structural Materials. Volume 133, pp. 383-387, doi : 10.1016 / 0921-5093 (91) 90093-3 .
  • with André Katz: A geometric approach to chemical ordering in icosahedral structures. In: Proceddings of the Fourth International Conference on Quasicrystals. St. Loius, MO, USA May 31-June 5, 1992 (= Journal of Non-Crystalline Solids. 153/154). North-Holland, Amsterdam 1993, pp. 187-195, doi : 10.1016 / 0022-3093 (93) 90340-4 .
  • as editor with Françoise Axel: Beyond Quasicrystals. Winter School, Les Houches, March 7-18, 1994 (= Center de Physique des Houches. 3). Springer et al., Berlin et al. 1995, ISBN 3-540-59251-2 .

Web links

Individual evidence

  1. ↑ Date of birth according to Idref
  2. ^ Entry by Gratias at the Académie des sciences
personal data
SURNAME Gratias, Denis
BRIEF DESCRIPTION French physicist and crystallographer
DATE OF BIRTH September 22, 1947
PLACE OF BIRTH Paris