The effect of powder coarseness on crystallization kinetics of Ge11Ga11Te78 infrared glass

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F17%3A39902744" target="_blank" >RIV/00216275:25310/17:39902744 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1007/s10973-017-6148-0" target="_blank" >http://dx.doi.org/10.1007/s10973-017-6148-0</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s10973-017-6148-0" target="_blank" >10.1007/s10973-017-6148-0</a>

Result language
angličtina
Original language name
The effect of powder coarseness on crystallization kinetics of Ge11Ga11Te78 infrared glass
Original language description
The effect of powder particle size on non-isothermal crystallization kinetics of Ge11Ga11Te78 glass was examined by differential scanning calorimetry. Multivariate kinetic analysis was used to deconvolute the complex crystallization data. The overall process was found to be composed of initial tellurium precipitation followed by simultaneous formation of Ga2Te5 and GeTe phases. While the Te precipitation followed the nucleation growth Johnson-Mehl-Avrami kinetics with the growth originating mainly from surface and mechanically induced defects, the formation of gallium and germanium tellurides proceeded autocatalytically with a significantly lower involvement of the defects-based crystal growth. The model-based part of the kinetic behavior was found to be uninfluenced by the change in powder coarseness-both crystallization sub-processes were described in terms of similar models with similar kinetic exponents for all particle size fractions. On the other hand, the model-free kinetic parameters (activation energies, pre-exponential factors and crystallization enthalpies) were found to be significantly changing with increasing particle size; the observed trends were explained in terms of the changing amounts of the two involved types of crystallization centers.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20300 - Mechanical engineering

Project
<a href="/en/project/GA17-11753S" target="_blank" >GA17-11753S: Kinetic analysis of complex physico-chemical processes</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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