The effect of material aging on crystallization kinetics of Se70Te30 glass

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F16%3A39902163" target="_blank" >RIV/00216275:25310/16:39902163 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0040603116301447?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0040603116301447?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.tca.2016.06.005" target="_blank" >10.1016/j.tca.2016.06.005</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The effect of material aging on crystallization kinetics of Se70Te30 glass

Popis výsledku v původním jazyce

The effect of long-term room-temperature degradation (up to 6 months) on Se70Te30 crystallization kinetics was investigated by differential scanning calorimetry in dependence on experimental conditions of the measurement applied heating rate and particle size of the powdered material. In case of very fine powders massive amorphous-to-crystalline degradation occurred even at room temperature, indicating that the small powder grains have fully defects-imbued inner structure that accelerates crystal growth. The kinetic data obtained for the consequent crystallization of the remaining glassy matrix showed that the defects-based Johnson-Mehl-Avrami crystallization is under quasi-equilibrium conditions further accelerated towards autocatalytic mechanism. Coarse powders, on the other hand, exhibited primary degradation only in a surface layer of the powder grains. The main effect of the coarse powders aging was found to be associated with marked enhancement of crystal growth originating from volume-located nuclei-either a sub-T-g nucleation occurred during aging or some pre-existing nuclei were activated during this time (possibly via mechanical stresses arising from structural relaxation processes).

Název v anglickém jazyce

The effect of material aging on crystallization kinetics of Se70Te30 glass

Popis výsledku anglicky

The effect of long-term room-temperature degradation (up to 6 months) on Se70Te30 crystallization kinetics was investigated by differential scanning calorimetry in dependence on experimental conditions of the measurement applied heating rate and particle size of the powdered material. In case of very fine powders massive amorphous-to-crystalline degradation occurred even at room temperature, indicating that the small powder grains have fully defects-imbued inner structure that accelerates crystal growth. The kinetic data obtained for the consequent crystallization of the remaining glassy matrix showed that the defects-based Johnson-Mehl-Avrami crystallization is under quasi-equilibrium conditions further accelerated towards autocatalytic mechanism. Coarse powders, on the other hand, exhibited primary degradation only in a surface layer of the powder grains. The main effect of the coarse powders aging was found to be associated with marked enhancement of crystal growth originating from volume-located nuclei-either a sub-T-g nucleation occurred during aging or some pre-existing nuclei were activated during this time (possibly via mechanical stresses arising from structural relaxation processes).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Thermochimica Acta

ISSN

0040-6031

e-ISSN

1872-762X

Svazek periodika

638

Číslo periodika v rámci svazku

August

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

25-34

Kód UT WoS článku

000381248200004

EID výsledku v databázi Scopus

2-s2.0-84975894226