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Hydrothermal grown ZnO single crystals were annealed in N2 or O2 between 900 and 1300 °C. Positron lifetime measurements reveal a single lifetime in all the ZnO samples before and after annealing. The positron lifetime is about 181 ps after annealing at 900 °C in either N2 or O2 atmosphere. However, increase of the positron lifetime is observed after further annealing the sample at higher temperatures...
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