6533b872fe1ef96bd12d443e
RESEARCH PRODUCT
'Cold' crystallization in nanostructurized 80GeSe2-20Ga2Se3 glass
Oleh ShpotyukAdam IngramRoman SzatanikB. KulykHalyna KlymRoman SerkizLaurent CalvezElena Petracovschisubject
Materials scienceNano ExpressAnnealing (metallurgy)Scanning electron microscopePositron annihilationNucleationChalcogenide glass[CHIM.MATE]Chemical Sciences/Material chemistryCondensed Matter PhysicsMolecular physicslaw.inventionPositron annihilation spectroscopyAnnealingChalcogenide glass Crystallization Annealing Positron annihilation TrappingCrystallographyPositronMaterials Science(all)lawChalcogenide glassTrappingGeneral Materials ScienceCrystallizationCrystallizationDoppler broadeningdescription
International audience; '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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-01-01 | Nanoscale Research Letters |