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Positron Lifetime Study of the Crystal Evolution and Defect Formation Processes in a Scintillating Glass

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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 (1, 2, and 3) 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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Document Type: Research Article

Affiliations: 1: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China 2: Key Laboratory of Nuclear Analysis Techniques,Institute of High Engergy Physics,Chinese Academy of Sciences, Beijing 100039, China 3: School of Chemical Engineering, University of Adelaide, Adelaide SA 5005, Australia

Publication date: October 1, 2009

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