title: 'Cold' crystallization in nanostructurized 80GeSe2-20Ga2Se3 glass.
abstract: 'Cold' crystallization in 80GeSe2-20Ga2Se3 chalcogenide glass nanostructurized due to thermal annealing at 380°C for 10, 25, 50, 80, and 100 h are probed with X-ray diffraction, atomic force, and scanning electron microscopy, as well as positron annihilation spectroscopy performed in positron annihilation lifetime and Doppler broadening of annihilation line modes. It is shown that changes in defect-related component in the fit of experimental positron lifetime spectra for nanocrystallized glasses testify in favor of structural fragmentation of larger free-volume entities into smaller ones. Nanocrystallites of Ga2Se3 and/or GeGa4Se8 phases and prevalent GeSe2 phase extracted mainly at the surface of thermally treated samples with preceding nucleation and void agglomeration in the initial stage of annealing are characteristic features of cold crystallization.
authors: Lviv Polytechnic National University, 12 Bandera str, Lviv, 79013 Ukraine.
authors: Halyna
authors: H
authors: Klym
authors: Physics Faculty of Opole University of Technology, 75 Ozimska str, Opole, 45370 Poland.
authors: Adam
authors: A
authors: Ingram
authors: Lviv Institute of Materials of SRC 'Carat', 202 Stryjska str, Lviv, 79031 Ukraine ; Institute of Physics of Jan Dlugosz University, 13/15 al. Armii Krajowej, Czestochowa, 42201 Poland.
authors: Oleh
authors: O
authors: Shpotyuk
authors: Equipe Verres et et Céramiques, UMR-CNRS 6226, Institute des Sciences chimiques de Rennes, Université de Rennes 1, Rennes, Cedex 35042 France.
authors: Laurent
authors: L
authors: Calvez
authors: Equipe Verres et et Céramiques, UMR-CNRS 6226, Institute des Sciences chimiques de Rennes, Université de Rennes 1, Rennes, Cedex 35042 France.
authors: Elena
authors: E
authors: Petracovschi
authors: Ivan Franko National University of Lviv, 1 Universytetska str, Lviv, 79000 Ukraine.
authors: Bohdan
authors: B
authors: Kulyk
authors: Ivan Franko National University of Lviv, 1 Universytetska str, Lviv, 79000 Ukraine.
authors: Roman
authors: R
authors: Serkiz
authors: Opole University, 11a Kopernika sq, Opole, 45040 Poland.
authors: Roman
authors: R
authors: Szatanik
keywords: Annealing; Chalcogenide glass; Crystallization; Positron annihilation; Trapping