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Crystallization kinetics in Se-Te glassy system-Effect of long-term material degradation
Authors: Svoboda Roman
Year: 2016
Type of publication: článek v odborném periodiku
Name of source: Thermochimica Acta
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 108-119
Titles:
Language Name Abstract Keywords
cze Krystalizační kinetika v Se-te systému - efekt dlouhodobé materiálové degradace Vliv dlouhodobého skladování při pokojové teplotě na krystalizaci byl zkoumán pro sklovité vzorky Se90Te10, Se80Te20 a Se70Te30 pomocí metody DSC. Výsledky ukázaly rozsáhlý stupeň degradace vzniklý při skladování těchto materiálů při teplotách pod jejich teplotou skelné transformace. krystalizační kinetika; DSC; Se-Te chalkogenidová skla; dlouhodobá degradace
eng Crystallization kinetics in Se-Te glassy system-Effect of long-term material degradation The influence of long-term laboratory-temperature degradation on the crystallization kinetics of the Se90Te10, Se80Te20 and Se70Te30 chalcogenide glasses was studied by differential scanning calorimetry. Periodical measurements during the 6 months aging period have shown that the fine Se-Te powders degraded largely, large degree of crystallinity occurred even though the materials were stored well below their glass transition temperature. The degradation increased with Te content. The defects-based residual crystallization kinetics exhibited by the fine Se-Te powders was not influenced significantly by the continuous degradation. Coarse Se-Te powders, on the other hand, exhibited only weak degradation with low amount of crystallinity occurring during the 6 months period but the crystallization kinetics of the degraded glasses changed markedly. The degraded coarse Se-Te powders have shown increased nuclei based volume-located growth of crystallites, which indicates that nucleation proceeded significantly below the glass transition; the effect increased largely with Te content. Crystallization kinetics; DSC; Se-Te chalcogenide glass; Long-term degradation

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