Structural free volumes and systematics of positron lifetimes in quasicrystalline decagonal and adjacent crystalline phases of Al-Ni-Co, Al-Cu-Co, and Al-Ni-Fe alloys
- 1 September 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 52 (9) , 6411-6416
- https://doi.org/10.1103/physrevb.52.6411
Abstract
Structural free volumes in the stable quasicrystalline decagonal and adjacent crystalline phases in the Al-Ni-Co, Al-Cu-Co, and Al-Ni-Fe alloy systems were studied by means of positron lifetime measurements. The comparison of different phases and different alloy systems enables an unambiguous assessment of the positron lifetimes in the quasicrystalline state. In each alloy system the quasicrystalline decagonal phase reveals a higher value of the positron lifetime than in the crystalline compounds, which is discussed in terms of different types of structural vacancies or vacancy-type free volumes in the various phases.Keywords
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