Positron annihilation studies of an icosahedral quasicrystal and the cubic<i>R</i>phase of Al-Li-Cu

Abstract

Positron annihilation lifetime and Doppler-broadening measurements have been performed for Bridgman-grown single-grained icosahedral quasicrystal and cubic R phase of Al-Li-Cu. The results are consistent with the existence of triacontahedral clusters with the vacant center in the icosahedral phase as well as in the R phase.