Super cold-crystallization of sodium iodine in selenium based chalco-halide glasses

Super cold-crystallization of sodium iodine in selenium based chalco-halide glasses

Mechanical properties of a chalco-halide glass of the composition (0.72 GeSe2–0.28 Ga2Se3)75 NaI25 are studied during isothermal treatment below Tg (Tg-60 °C). The evolution of the Young's Modulus (E), the damping (Q−1) and the apparent viscosity (J−1, reverse of the creep rate) during heat tre...

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Veröffentlicht in:Journal of non-crystalline solids 2023-10, Vol.617, p.122503, Article 122503
Hauptverfasser: Fourmentin, Claire, Célarié, Fabrice, Gueguen, Yann, Verger, Louisiane, Zhang, Xiang-Hua, Rozé, Mathieu, Guimond, Yann, Calvez, Laurent
Format: Artikel
Sprache:eng
Schlagworte:
Chalcohalide glass
Chemical Sciences
Crystallization
Isothermal treatment
Mechanical properties
Physics
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Zusammenfassung:Mechanical properties of a chalco-halide glass of the composition (0.72 GeSe2–0.28 Ga2Se3)75 NaI25 are studied during isothermal treatment below Tg (Tg-60 °C). The evolution of the Young's Modulus (E), the damping (Q−1) and the apparent viscosity (J−1, reverse of the creep rate) during heat treatment show that a structural rearrangement occurs in the glass below Tg. X-Ray diffraction and transmission measurements of the sample after heat treatment highlight the beginning of a super cold crystallization of cubic NaI within the glass after 1 month at Tg-60 °C. After 3 months of heat treatment, NaI crystals of about 31 nm size have been observed in the glass matrix by transmission electron microscopy.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2023.122503