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Item Positron annihilation lifetime spectroscopy in application to nanostructured glasses and ceramics(Видавництво Львівської політехніки, 2017-12-23) Klym, Halyna; Kostiv, Yuriy; Lviv Polytechnic National UniversityModified nanostructured Ge-Ga-Se chalcogenide glasses and oxide MgO-Al2O3 ceramics were investigated using positron annihilation lifetime spectroscopy. It was shown that crystallization process in 80GeSe2-20Ga2Se3 glasses annealed at 380°C for 25 and 50 h indicates specific free-volume transformation. It is established that water vapor modifies defects located near grain boundaries in MgO-Al2O3 ceramics sintered at 1300 °C, the process being accompanied by void fragmentation at water adsorption with further void agglomeration at water desorption after drying.