Abstract
Raman scattering, X-ray diffraction, and differential scanning calorimetry in the temperature range 300–800 K are used to show that, upon isothermal annealing of glass GeSe2 powders below the glass-softening temperature (T g = 635 ± 2 K), fragments of high-temperature polymorphic modifications having no long-range order (HTPM polymorphoids) decompose and transform into low-temperature polymorphoids (LTPM) with an exothermic effect. A high concentration of LTPM polymorphoids in the glass and their stabilization upon annealing below T g favor ordering and the appearance of coherent domains of low-temperature α-GeSe2 (3D form). Upon annealing above T g , the reverse LTPM → HTPM polymorphoid transformation accompanied by an endothermic effect takes place, which results in the predominance of HTPM β-GeSe2 polymorphoids (2D form) in glassy GeSe2 and their crystallization.
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Aleksandrovich, E.V., Minaev, V.S. & Timoshenkov, S.P. Structural relaxation of glassy GeSe2 during isothermal annealing below and above T g . Tech. Phys. 60, 510–514 (2015). https://doi.org/10.1134/S1063784215040039
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DOI: https://doi.org/10.1134/S1063784215040039