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Nucleation in As2Se3 glass studied by DSC

Authors: Svoboda Roman | Málek Jiří

Year: 2014

Type of publication: článek v odborném periodiku

Name of source: Thermochimica Acta

Publisher name: Elsevier Science BV

Place: Amsterdam

Page from-to: 16-21

Titles:

Language	Name	Abstract	Keywords
cze	Nukleace v As2Se3 skle studovaná pomocí DSC	Pomocí DSC byla studována nukleace ve sklovitém As2Se3 v závislosti na velikosti částic. Získané výsledky byly široce diskutovány s ohledem na podmínky měření.	nukleace; As2Se3; entalpie tání; velikost částic
eng	Nucleation in As2Se3 glass studied by DSC	Differential scanning calorimetry was used to study nucleation behavior in As2Se3 glass, dependent on particle size. The nucleation process was examined for a series of different coarse powders; the nucleation rate was estimated from the proportion of the crystalline material fraction. The enthalpy of fusion was utilized in this respect, and a correlation between Delta H-m, and Delta H-c was confirmed. Two mechanisms of nucleus formation were found: classical heterogeneous nucleation (following CNT) and so-called "activation" of mechanically-induced defects. The latter appears to represent rapid formation of crystallization centers from a damaged glassy structure, where complete saturation occurs for fine powders in the range of 195-235 degrees C. A high amount of mechanical defects, on the other hand, was found to partially suppress the CNT nucleation process.	Nucleation; DSC; As2Se3 glass; Enthalpy of fusion; Particle size