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- W4229884038 abstract "In this paper models of cubic approximants in the AgAlMg system are developed and their structure chemistry is described. The analysis of two complex binary AgMg phases by means of the 13-cluster concept showed that a third component is necessary to construct quasicrystals or large approximants. The four unit cells of the quasiperiodic tiling by Levine, Steinhardt and Socolar, the rhombohedron, the rhombic dodecahedron, the rhombic icosahedron, and the rhombic triacontahedron, are used to build periodic structures. Together with an atomic decoration of the zonohedra the complete structures of a FK-type 11-approximant, a MI-type 11-approximant, a 21-approximant, and a 32-approximant are generated. The structures of the models are described. The FK-type 11-approximant is isostructural to the Bergman phase Mg32(Al,Zn)49. The MI-type 11-approximant is an almost bcc packing of Mackay icosahedra and therefore one variant of the cubic 11-approximants within the I3-family. The two higher approximants contain regions which are typical of I3-phases and regions of Frank-Kasper type. The 32-approximant has a large unit cell with a lattice parameter of 37.96 Å and 2828 atoms in the unit cell. But there are only six different coordination polyhedra in it. Calculated single crystal precession photographs along the twofold, threefold, and fivefold directions as well as powder diffraction patterns are shown and compared with experimental data of other authors." @default.
- W4229884038 created "2022-05-11" @default.
- W4229884038 date "1992-09-01" @default.
- W4229884038 modified "2023-10-14" @default.
- W4229884038 title "Subject index of volume 187" @default.
- W4229884038 doi "https://doi.org/10.1016/0925-8388(92)90448-i" @default.
- W4229884038 hasPublicationYear "1992" @default.
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