'Cold' crystallization in nanostructurized 80GeSe 2 -20Ga 2 Se 3 glass

Halyna Klym (1) , Adam Ingram (2) , Oleh Shpotyuk (3, 4) , Laurent Calvez (5) , Elena Petracovschi (5) , Bohdan Kulyk (6) , Roman Serkiz (6) , Roman Szatanik (2)

1 LPNU - National Polytechnic University of Lviv
2 University of Opole
3 Lviv Scientific Research Institute of Materials of SRC "Carat"
4 Institute of Physics [Jan Dlugosz University in Częstochowa]
5 ISCR - Institut des Sciences Chimiques de Rennes
6 Ivan Franko National University of Lviv

'Cold' crystallization in 80GeSe 2-20Ga 2 Se 3 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 Ga 2 Se 3 and/or GeGa 4 Se 8 phases and prevalent GeSe 2 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.

Keywords: Positron annihilation; Chalcogenide glass; Annealing; Crystallization; Trapping

Domains: Chemical Sciences; Material chemistry

Halyna Klym, Adam Ingram, Oleh Shpotyuk, Laurent Calvez, Elena Petracovschi, et al.. 'Cold' crystallization in nanostructurized 80GeSe 2 -20Ga 2 Se 3 glass. Nanoscale Research Letters, 2015, 10 (1), pp.49. ⟨10.1186/s11671-015-0775-9⟩. ⟨hal-01142067⟩