1. In-situ high-pressure X-ray diffraction on the Zn6Sc 1/1 periodic cubic approximant to a quasicrystal
- Author
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Ceasar Pay Gómez, Tsunetomo Yamada, Hiroyuki Takakura, Gaston Garbarino, Marc de Boissieu, Ryuji Tamura, Dept. Mat. Sci. & Technol Noda, Tokyo Univ. Sci., European Synchrotron Radiation Facility (ESRF), Grad. Sch. Engn. Div. Appl. Phys., Hokkaido University [Sapporo, Japan], Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Angström Laboratory, Uppsala University, Tokyo University Sci. Dept. Sci. & Technol., and The University of Tokyo (UTokyo)
- Subjects
Phase transition ,Chemistry ,Icosahedral symmetry ,approximants ,Quasicrystal ,02 engineering and technology ,[CHIM.MATE]Chemical Sciences/Material chemistry ,Kemi ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Inorganic Chemistry ,Crystallography ,Lattice constant ,phase transition ,Phase (matter) ,0103 physical sciences ,Chemical Sciences ,General Materials Science ,010306 general physics ,0210 nano-technology ,quasicrystals ,Superstructure (condensed matter) ,Phase diagram ,Monoclinic crystal system - Abstract
International audience; The Zn6Sc 1/1 cubic approximant to a quasicrystal has been studied in-situ at high pressures by single-crystal X-ray diffraction. This phase can be described as a bcc packing of Tsai-type icosahedral clusters whose center is occupied by a disordered Zn-4 tetrahedron. At ambient pressure the Zn6Sc undergoes a structural phase transition at 159 K to a monoclinic superstructure in which the Zn-4 tetrahedra are orientationally ordered along the [101] direction of the high-temperature bcc phase. In the pressure range up to 35 GPa, two new superstructures have been observed. The second phase corresponds to a four-fold pseudo cubic superstructure, i.e. a very large unit cell with a lattice parameter of about 5.5 nm. The resulting pressure-temperature phase diagram is different from that of Cd6Yb, which was reported by Watanuki et al. (2006).
- Published
- 2014
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