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Figure 2
An icosahedron viewed along two of its symmetry axes; (a) two- and (b) threefold. Triples of twofold axes represent orthogonal bases for the α-phase in Al coordinates. The 〈ττ21〉 set represents irrational Al directions (gray arrows) denoted a′, b′, c′ (OR1). The 〈100〉 set (black arrows denoted a, b, c) has bases parallel with Al (OR2). Coordinates of type [\tau 10] show icosahedral vertices giving directions of fivefold symmetry. Twofold directions are given in brackets. (b) shows that both systems have a common (111) plane.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 70| Part 5| October 2014| Pages 888-896
doi:10.1107/S2052520614017880
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