Positron lifetime study of the crystal evolution and defect formation processes in a scintillating glass
Nie, J., Yu, R., Wang, B., Ou, Y., Zhong, Y., Li, Z., Xia, F. and Chen, G. (2009) Positron lifetime study of the crystal evolution and defect formation processes in a scintillating glass. Journal of the American Ceramic Society, 92 (10). pp. 2422-2424.
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The crystal evolution and defect formation in scintillating glasses as a consequence of thermal annealing were studied by annihilation lifetime spectroscopy and UV-Vis absorption spectroscopy. The annihilation lifetime spectra and UV-Vis spectra were recorded on glass 50SiO2–45ZnO–5BaF2 before and after annealing at 580°C for 16, 32, and 48 h, respectively. The results show that the three lifetime components (τ1, τ2, and τ3) and the corresponding intensities (I1, I2, and I3) change systematically with increasing annealing time. This reflects the crystal evolution and defect formation in the glass matrix. The continued crystal evolution was also revealed by the UV-Vis spectra, as the absorption edge of the material shifted to a lower energy with prolonged annealing.
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