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Vanadium samples with controlled oxygen impurity of up to 2460at.ppm were irradiated with fast neutrons to a fluency of 8.3×1018ncm-12 at 150°C. The irradiation-induced nanovoids and the interaction between the defects and the oxygen impurities are studied systematically by combining the positron lifetime technique, the coincidence Doppler broadening technique and the first-principles calculations...
We have studied the chalcopyrite compound ZnGeAs2 to access its potential as a novel photovoltaic material. Thin films of ZnGeAs2 have been produced by pulsed laser deposition.The films are deposited at 315??C and are amorphous. They crystallize above 450??C and improve in crystallinity up to and including 600??C. At that temperature the Hall mobility is 55 ?? 2 cm2/Vs, which is within uncertainty...
Quenched-in vacancies in a β Ti–Nb–Sn alloy are studied by positron annihilation spectroscopy. It has been reported that the superelastic properties of the alloy are strongly affected by the quenching temperature between 700 and 900°C, as a consequence of the different concentrations of quenched-in vacancies. However, the present positron lifetime experiments and the corresponding first-principles...
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