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Crystal Growth Kinetics in GeS2 Glass and Viscosity of Supercooled Liquid
Authors: Málek Jiří | Podzemná Veronika | Shánělová Jana
Year: 2021
Type of publication: článek v odborném periodiku
Name of source: Journal of Physical Chemistry B
Publisher name: American Chemical Society
Place: Washington
Page from-to: 7515-7526
Titles:
Language Name Abstract Keywords
cze Krystalový růst v GeS2 skle a viskozita podchlazené kapaliny Kinetika růstu krystalů a morfologie v GeS2 objemovém skle a na skelném povrchu je popsána v této práci. Během růstu krystalů byly sledovány dvě krystalografické modifikace a jejich růst byl popsán společnou růstovou křivkou, která je dána viskozitním chováním a termodynamickými podmínkami. kinetika krystalizace; růst krystalů; GeS2; sklo; viskozita; uspořádání
eng Crystal Growth Kinetics in GeS2 Glass and Viscosity of Supercooled Liquid The crystal growth kinetics and morphology in germanium disulfide bulk glass and glass surface is described. The structural relaxation taking place below the glass transition is slow and the corresponding volumetric change is negligible. Therefore, it does not affect substantially the crystal growth process. The crystal growth rate of low temperature beta-GeS2 and high temperature alpha-GeS2 polymorphs in the bulk glass is comparable, being slightly decoupled from the shear viscosity below the glass transition. The crystal growth rate of beta-GeS2 in an amorphous thin film of the same composition is several orders of magnitude faster than that at the surface of bulk glass. This fast surface crystal growth is strongly decoupled from viscosity. Such behavior resembles the glass-to-crystal fast growth mode observed by several authors in some organic molecular glasses. Taking into account previously reported viscosity and heat capacity data, the crystal growth kinetics of both polymorphs can be quantitatively described by the 2D surface growth model for low and high supercooling. The nonisothermal differential scanning calorimetry experiments are analyzed, providing evidence of a complex nature of the overall crystallization process with apparent activation energy comparable to that obtained from isothermal microscopy measurement of crystal growth in the same temperature range. medium-range order; crystallization kinetics; structural relaxation; temperature; sulfide; sulfur; transition; disulfide; density

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