Combined dilatometric and calorimetric study of kinetic processes occurring in Ge20Te76Se4 infrared bulk glass

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F16%3A39901017" target="_blank" >RIV/00216275:25310/16:39901017 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2015.11.015" target="_blank" >http://dx.doi.org/10.1016/j.jnoncrysol.2015.11.015</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2015.11.015" target="_blank" >10.1016/j.jnoncrysol.2015.11.015</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Combined dilatometric and calorimetric study of kinetic processes occurring in Ge20Te76Se4 infrared bulk glass

Popis výsledku v původním jazyce

Kinetic processes (cold crystallization and structural relaxation) occurring in the Ge20Te76Se4 infrared bulk glass were studied by means of differential scanning calorimetry (DSC) and thermomechanical analysis (TMA). The crystallization behaviour was described in terms of the Autocatalytic and Johnson-Mehl-Avrami kinetic models. The crystallization activation energies evaluated by the two techniques were: 164 +/- 7 kJ mol(-1) (DSC) and 153 8 kJ mol(-1) (TMA). The agreement between the two values was explained in terms of the marked glass stability and glass-forming ability of the Ge20Te76Se4 glass, where the crystal growth proceeds at rather low viscosities. Regarding the process complexity, increasing heating rate led to a decrease of the dimensionality of the formed crystallites (3D -> 2D). Structural relaxation kinetics was described in terms of the Tool-NarayanaswamyMoynihan model. Values of the parameters of the TNM model were interpreted with respect to the molecular structures determined by Raman spectroscopy. The Se <-> Te substitution appears to lead to larger interconnection between the GeTe4 tetrahedral chains rather than to significant changes in the intra-chain bonding. Good agreement between the activation energies of the relaxation process determined by the two experimental techniques was again obtained: 501 +/- 10 kJ mol(-1) (DSC) and 490 +/- 34 kJ mol(-1) (TMA).

Název v anglickém jazyce

Combined dilatometric and calorimetric study of kinetic processes occurring in Ge20Te76Se4 infrared bulk glass

Popis výsledku anglicky

Kinetic processes (cold crystallization and structural relaxation) occurring in the Ge20Te76Se4 infrared bulk glass were studied by means of differential scanning calorimetry (DSC) and thermomechanical analysis (TMA). The crystallization behaviour was described in terms of the Autocatalytic and Johnson-Mehl-Avrami kinetic models. The crystallization activation energies evaluated by the two techniques were: 164 +/- 7 kJ mol(-1) (DSC) and 153 8 kJ mol(-1) (TMA). The agreement between the two values was explained in terms of the marked glass stability and glass-forming ability of the Ge20Te76Se4 glass, where the crystal growth proceeds at rather low viscosities. Regarding the process complexity, increasing heating rate led to a decrease of the dimensionality of the formed crystallites (3D -> 2D). Structural relaxation kinetics was described in terms of the Tool-NarayanaswamyMoynihan model. Values of the parameters of the TNM model were interpreted with respect to the molecular structures determined by Raman spectroscopy. The Se <-> Te substitution appears to lead to larger interconnection between the GeTe4 tetrahedral chains rather than to significant changes in the intra-chain bonding. Good agreement between the activation energies of the relaxation process determined by the two experimental techniques was again obtained: 501 +/- 10 kJ mol(-1) (DSC) and 490 +/- 34 kJ mol(-1) (TMA).

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GAP106%2F11%2F1152" target="_blank" >GAP106/11/1152: Reverzibilní krystalizace a strukturni relaxace amorfních materiálů pro záznam informace</a><br>

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

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

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Svazek periodika

432

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

493-498

Kód UT WoS článku

000367769300043

EID výsledku v databázi Scopus

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