Structure of a high-order icosahedral approximant phase in Mg–Ga–Al–Zn system
- 1 August 1991
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Letters
- Vol. 64 (2) , 95-103
- https://doi.org/10.1080/09500839108214673
Abstract
The melt-spun Mg39·5Ga16·4 A14·1Zn40·0 ribbon consists entirely of micrograins of an icosahedral phase (I-phase). The calorimetric and X-ray diffraction studies have shown that the I-phase undergoes an exothermic transformation to an approximant crystalline phase at 630 K on heating at a rate of 20 K min−1. Detailed structural analysis of the crystalline phase has revealed that the phase corresponds to a 3/2–2/1–2/1 rational approximant of I-phase, which has the orthorhombic C-type Bravais lattive with large cell parameters, a = 36·93 ± 0·06 Å, b = 22·83 ± 0·04 Å and c = 22·96 ± 0·04 Å.Keywords
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