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Diffuse Scattering in the Zn6Sc 1/1 cubic approximant.
Department of Material & Science., Tokyo Univ. of Science, Noda, Japan..
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..
ITAP, Universitat Stuttgart.
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2010 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The low-temperature phase transition of the Zn6Sc cubic 1/1 approximant [1] has been investigated by X-ray diffraction. It is a crystalline approximant to a recently discovered quasicrystal Zn88Sc12 [2] and has a bcc lattice composed of a Tsai-type cluster with an orientationally disordered Zn tetrahedra at the centers [3]. The phase transition undergoes below 160K and has been attributed to the orientational ordering of the Zn tetrahedra along [110] direction of hightemperature phase [1, 4]. In order to obtain an insight into the orientational ordering occurring at the phase transition, diffuse scattering has been measured. Well above the phase transition at 220K (i.e. 60 K above) we observed a broad diffuse scattering intensity which sharpen and merges into a Bragg peak as the temperature decreases and reaches the transition temperature (Tc). This signature of short-range ordering above Tc will be discussed in details and compared to refined average structures obtained between Tc and room temperature by measuring Bragg peaks.  [1] R. Tamura et al., Phys. Rev. B 71, 092203, (2005). [2] P. C. Canfield et al., Phy. Rev. B 81, 020201(R) (2010). [3] Q. Lin and J. D. Corbett, Inorg. Chem., 43, 1912, (2004). [4] T. Ishimasa et al., Phil. Mag., 87, 2887, (2007).

Place, publisher, year, edition, pages
Darmstadt, 2010. Vol. A66, p. 150-150
Series
Acta Cryst.
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-337779OAI: oai:DiVA.org:uu-337779DiVA, id: diva2:1171200
Conference
26th European Crystallographic Meeting
Funder
Swedish Research Council
Available from: 2018-01-05 Created: 2018-01-05 Last updated: 2018-01-05

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