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Crystal Growth Velocity in As2Se3 Supercooled Liquid
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Crystal Growth & Design
Publisher name: American Chemical Society
Place: Washington
Page from-to: 4990-4999
Titles:
Language Name Abstract Keywords
cze Rychlost růstu krystalů v podchlazené tavenině As2Se3 Růst krystalů v pochlazené tavenině As2Se3 byl studován pomocí optické mikroskopie. Zárodky krystalů se tvořili pouze na povrchu vzorku, oblast nuleace byla ověřena a kvantifikována pro vybranou teplotu. Rychlost růstu krystalů byla stanovena pro celý rozsah od teploty skelného přechodu do teploty tání a její závislost na teplotě byla popsána příslušným modelem. As-Se; krystalizační kinetika; viskozita; nukleace; růst krystalů
eng Crystal Growth Velocity in As2Se3 Supercooled Liquid The crystal growth velocity of spherulitic As2Se3 in a supercooled melt of the same composition was studied by optical microscopy and thermoanalytical methods in isothermal and nonisothermal conditions. The time dependence of crystal size is linear, which suggests the crystal growth is controlled by interface kinetics. Crystal growth velocity was determined as the slope of these linear dependences. The experimental results presented in this paper considerably extend the previously reported range of crystal growth velocity. All isothermal crystal growth velocity data can be well described by the standard two-dimensional surface nucleated growth model (2Dsg) including crystal growth viscosity decoupling (xi = 0.647). The activation energy of crystal growth for microscopic experiments is in a good agreement with values obtained from thermoanalytical experiments, and the ratio of the activation energy of crystal growth and the activation energy of viscous flow well corresponds to an independently determined decoupling parameter. The same model successfully describes also crystalline layer thickness and growth pattern at the amorphous As2Se3 surface in nonisothermal conditions. as-se; crystallization kinetics; chalcogenide glasses; phase-change; viscosity; temperature; transition; nucleation

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