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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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).

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CF - Physical chemistry and theoretical chemistry

OECD FORD branch

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Project

<a href="/en/project/GAP106%2F11%2F1152" target="_blank" >GAP106/11/1152: Reversible crystallization and structural relaxation in amorphous materials used for phase change recording</a><br>

Continuities

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

Publication year

2016

Confidentiality

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

Name of the periodical

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

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Volume of the periodical

432

Issue of the periodical within the volume

January

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

6

Pages from-to

493-498

UT code for WoS article

000367769300043

EID of the result in the Scopus database

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