(Видавництво Львівської політехніки, 2017-12-23) Klym, Halyna; Kostiv, Yuriy; Lviv Polytechnic National University
Modified 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.
