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Studies of Defects in ZnO by Positron Annihilation

  • Werner Puff (a1), Sebastian Brunner (a1), Peter Mascher (a2) and Adam G. Balogh (a3)

Abstract

In order to investigate the basic properties of radiation-induced defects in ZnO crystals, positron annihilation lifetime and Doppler-broadening measurements were performed on crystals sinterd for 18 hours at 1200 °C and irradiated with 3 MeV protons at 223 K. The irradiation induced a colour change of the specimens from the original yellowish-white to dark orange or even brown. Isochronal annealing experiments showed three annealing stages, centred at about 150 °C, 500 – 550 °C, and 750 °C, respectively. These stages are related to the annealing of variously sized vacancy complexes.

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Studies of Defects in ZnO by Positron Annihilation

  • Werner Puff (a1), Sebastian Brunner (a1), Peter Mascher (a2) and Adam G. Balogh (a3)

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