We measured the positron-annihilation lifetime in Al71.4Pd20.2Mn8.4, Al71.9Pd19.7Mn8.4, Al70.2Pd20.3Mn9.5, and Al69.1Pd21.5Mn9.4 polyquasicrystalline icosahedral quasicrystals. As-grown and plastically deformed single quasicrystals of Al70.6Pd21.1Mn8.3 were also studied. In every sample the lifetime spectrum consists of a single component with the lifetime of 206±4ps. The results indicate that icosahedral quasicrystalline AlPdMn contains a dense distribution of vacancy-type sites. These trapping sites seem to remain unaltered during plastic deformation at high temperature.
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Kanazawa et al. (1997) studied this question.
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