High-resolution positron lifetime and coincidence Doppler broadening spectroscopy were used to characterize defects in Fe76Al24 and Fe72Al28 alloys. In order to facilitate defect identification, a theoretical study was also made of basic vacancy-like defects in three phases of the Fe–Al system: ordered, short-range ordered, and disordered. Positron characteristics, like positron lifetime, positron binding energy to defects, high-momentum parts of Doppler broadening curves and specific trapping rates, were calculated for various defect configurations. The results were discussed in the context of experimental data obtained here and available in literature.

Positron Annihilation Study of Vacancies in Fe–Al Based Alloys. O.Melikhova, J.Čížek, J.Kuriplach, I.Procházka, M.Cieslar, W.Anwand, G.Brauer: Intermetallics, 2010, 18[4], 592-8