Volume 54, Number 6, June II 2001
|Page(s)||753 - 759|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Coherent -ray diffraction and phason fluctuations in quasicrystals
LTPCM, INPG, UMR CNRS 5614 - BP 75, 38402
St. Martin d'Heres Cedex, France
2 ESRF - BP 220, 38043 Grenoble Cedex, France
3 LAMEL-CNR - Via P. Gobetti 101, 40129 Bologna, Italy
4 Laboratoire d'étude des Microstructures, ONERA-CNRS - BP 72, 92320 Chatillon France and LLB, CEA, CNRS, CE Saclay - 91190 Gif-sur-Yvette, France
5 ILL - BP 156, 38042 Grenoble Cedex 9, France
6 CRMC2, CNRS, Campus de Luminy - case 913, 132888 Marseille Cedex 9, France
Accepted: 5 April 2001
Frozen-in phason fluctuations in single grains of icosahedral -- quasicrystals have been studied by high-resolution coherent X-ray scattering. Bragg peak widths scale as expected for a distribution of uniform phason strains. Strong relaxation of the uniform phason strain is observed after sample annealing. Large intensity fluctuations or speckle patterns are observed in the Bragg peaks due to the uniform phason strain distribution in the sample. Speckle patterns are also observed in the diffuse scattering located close to the Bragg reflections and are related to long-wavelength phason fluctuations taking place in the sample.
PACS: 61.44.Br – Quasicrystals / 61.10.Eq – X-ray scattering (including small-angle scattering)
© EDP Sciences, 2001
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