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'Cold' crystallization in nanostructurized 80GeSe2-20Ga2Se3 glass.

Klym H, Ingram A, Shpotyuk O, Calvez L, Petracovschi E, Kulyk B, Serkiz R, Szatanik R - Nanoscale Res Lett (2015)

Bottom Line: '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.

View Article: PubMed Central - PubMed

Affiliation: Lviv Polytechnic National University, 12 Bandera str, Lviv, 79013 Ukraine.

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.

No MeSH data available.


Related in: MedlinePlus

XRD patterns of 80GeSe2-20Ga2Se3glass before annealing (0 h) and annealed at 380°C for 10, 25, 50, 80, and 100 h.
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Fig1: XRD patterns of 80GeSe2-20Ga2Se3glass before annealing (0 h) and annealed at 380°C for 10, 25, 50, 80, and 100 h.

Mentions: The results of XRD measurements for 80GeSe2-20Ga2Se3 glasses before and after thermal annealing at 380°C during different time periods (for 10, 25, 50, 80, and 100 h) are shown in Figure 1. As it was noted earlier [18,22], the annealing at 380°C for 10 h does not change significantly the structure of the ChG, since no sharp crystalline features appear in their XRD patterns apart from noticeable decrease in characteristic amorphous gallous. Therefore, we can assume that even under this short-term heat treatment, there are some transformations in the intrinsic structure of ChG, which do not contribute directly to the crystallization.Figure 1


'Cold' crystallization in nanostructurized 80GeSe2-20Ga2Se3 glass.

Klym H, Ingram A, Shpotyuk O, Calvez L, Petracovschi E, Kulyk B, Serkiz R, Szatanik R - Nanoscale Res Lett (2015)

XRD patterns of 80GeSe2-20Ga2Se3glass before annealing (0 h) and annealed at 380°C for 10, 25, 50, 80, and 100 h.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385280&req=5

Fig1: XRD patterns of 80GeSe2-20Ga2Se3glass before annealing (0 h) and annealed at 380°C for 10, 25, 50, 80, and 100 h.
Mentions: The results of XRD measurements for 80GeSe2-20Ga2Se3 glasses before and after thermal annealing at 380°C during different time periods (for 10, 25, 50, 80, and 100 h) are shown in Figure 1. As it was noted earlier [18,22], the annealing at 380°C for 10 h does not change significantly the structure of the ChG, since no sharp crystalline features appear in their XRD patterns apart from noticeable decrease in characteristic amorphous gallous. Therefore, we can assume that even under this short-term heat treatment, there are some transformations in the intrinsic structure of ChG, which do not contribute directly to the crystallization.Figure 1

Bottom Line: '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.

View Article: PubMed Central - PubMed

Affiliation: Lviv Polytechnic National University, 12 Bandera str, Lviv, 79013 Ukraine.

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.

No MeSH data available.


Related in: MedlinePlus