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Diffuse scattering and phason modes in the Zn-Sc icosahedral quasicrystal
IMRAM, Tohoku University.
Institute of Materials Science and Technology, Vienna University of Technology, Vienna 1040, Austria.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Department of Material & Science., Tokyo Univ. of Science, Noda, Japan..
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2012 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Recently, a new binary icosahedral quasicrystal Zn-Sc has been obtained by Canfield et. al. [1]. Because of the chemical order and the x-ray contrast between Zn and Sc, this phase is a nice system for the structure refinement. On the other hand, a large amount of diffuse scattering can be seen on the x-ray diffraction pattern [1]. In this study, we carried out an absolute scale measurement of the x-ray diffuse scattering of i-ZnSc to study the possible presence of phason modes (phason diffuse scattering) and estimate phason elastic constats K1 and K2. Millimeter size single grain of i-ZnSc was obtained by slowly cooling from the melt. Systematic Q-scans and diffuse scattering maps have been measured on the D2AM beamline (ESRF) using an incoming x-ray energy equal to 9.3 keV. Compared with i-ZnMgSc quasicrystal [2], we find that the amount of diffuse scattering is larger in i-ZnSc sample. Also, the maximal Qperp value necessary for indexing the diffraction pattern was found to be less than 3 (r.l.u.) i.e. much smaller than for i-ZnMgSc for which it was found to be 7 [2]. In addition, as for other quasicrystals [3] a characteristic diffuse intensity distribution due to phason fluctuations around strong Bragg reflections is clearly visible on the systematic reciprocal space map. The ratio K2/K1 is found to be close to the three-fold instability limit, which results in the strong elongation of the diffuse scattering along directions parallel to a three-fold axis. Finally, the simulation is carried out based on the elastic theory and reproduces well the observed anisotropic shape of the diffuse scattering. [1] P. C. Canfield, et. al., Phys. Rev. B, 2010, 81, 020201.  [2] M. de Boissieu, et. al., Phys. Rev. Lett., 2005, 95, 105503.  [3] T. Janssen, et. al., Aperiodic Crystals. Oxford University Press, 2007

Place, publisher, year, edition, pages
Cairns, Australia., 2012.
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-338116OAI: oai:DiVA.org:uu-338116DiVA, id: diva2:1171436
Conference
APERIODIC ’12
Available from: 2018-01-07 Created: 2018-01-07 Last updated: 2018-01-07

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Pay Gómez, Cesar

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