Abstract:Al2O3
samples grown with natural well-ordered channels (having sizes of 30–90 nm in
diameter) perpendicular to the surface, one side closed, were measured by means of
Doppler broadening (DB) by variable energy positron (VEP) beam and positron
annihilation lifetime (PAL) spectroscopy. The samples annealed at 300 and
560 °C
showed amorphous structure and no positronium (Ps) formation. The sample annealed at
850 °C showed
γ-phase polycrystalline structure and Ps formation. We were not able to prove from the PAL… Show more
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