Extended Study on Crystal Growth and Viscosity in Ge-Sb-Se Bulk Glasses and Thin Films

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F17%3A39911950" target="_blank" >RIV/00216275:25310/17:39911950 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1021/acs.jpcb.7b04429" target="_blank" >http://dx.doi.org/10.1021/acs.jpcb.7b04429</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcb.7b04429" target="_blank" >10.1021/acs.jpcb.7b04429</a>

Result language

angličtina

Original language name

Extended Study on Crystal Growth and Viscosity in Ge-Sb-Se Bulk Glasses and Thin Films

Original language description

Crystal growth rates in Ge18Sb(28)Se(54) bulk glass and thin film were measured using optical and scanning electron microscopy under isothermal conditions. The studied temperature region was 255-346 degrees C and 254-286 degrees C for bulk glass and thin film, respectively. The compact crystalline layer growing from the surface into the amorphous core was formed in bulk glasses and no bulk crystallization was observed. In the case of thin films, needle-shape crystals were formed. The crystalline layer and needle-shape crystals grew linearly with time that corresponds to a crystal growth controlled by the crystal-liquid interface kinetics. In the narrow temperature range, crystal growth rates exhibit simple exponential behavior, so the activation energies of crystal growth for the studied temperature regions were estimated (EG = 294 6 kJ/mol for bulk glass and EG = 224 +/- 12 kJ/mol for thin film). Viscosity of Ge18Sb28Se54 material was measured in the region of the undercooled melt and glass. The extrapolation of viscosity data into the immeasurable, but important, temperature range is discussed. The experimental growth data were combined with melting and viscosity data and the appropriate growth models were proposed to describe crystal growth in a wide temperature region. The standard crystal growth models are based on a simple proportionality of the crystal growth rate to the viscosity (u proportional to eta(-1)). This simple proportionality holds for the bulk material. Nevertheless, in the thin films the decoupling of the crystal growth rate from the inverse viscosity occurs, and the standard kinetic growth models need to be corrected. Such corrections provide better description of experimental data and more realistic value of the parameter describing the mean interatomic distance in the crystal-liquid interface layer, where the crystal growth takes place.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/GA16-10562S" target="_blank" >GA16-10562S: Viscosity and kinetic phenomena in glass-forming systems</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

Name of the periodical

Journal of Physical Chemistry B

ISSN

1520-6106

e-ISSN

—

Volume of the periodical

121

Issue of the periodical within the volume

33

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

7978-7986

UT code for WoS article

000408598300025

EID of the result in the Scopus database

2-s2.0-85028305046