Publikace detail

Oxidation-influenced crystallization crystallization in (GeSe2)(x)(Sb2Se3)(1-x) chalcogenide glasse

Autoři: Svoboda Roman

Rok: 2019

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Non-Crystalline Solids

Název nakladatele: Elsevier Science BV

Místo vydání: Amsterdam

Strana od-do: 6-14

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Oxidací ovlivněná krystalizace v (GeSe2)(x)(Sb2Se3)(1-x) chalcogenidových sklech	Vliv kyslíku v atmosféře na krystalizaci (GeSe2)(x)(Sb2Se3)(1-x) skel s obsahem GeSe2 x = 0,3 - 0,5 byl zkoumán pomocí DSC, XRD a mikroskopie. Proces byl studován také z hlediska závislosti jeho kinetiky na velikosti částic a množství mechanicky indukovaných defektů.	krystalizace; kyslíková atmosféra; DSC; XRD; mikroskopie; Ge-Sb-Se skla
eng	Oxidation-influenced crystallization crystallization in (GeSe2)(x)(Sb2Se3)(1-x) chalcogenide glasse	Influence of oxygen atmosphere on crystallization of (GeSe(2))(x)(Sb2Se3)(1-x) glasses (for x = 0.3, 0.4 and 0.5) was investigated by differential scanning calorimetry, X-ray diffraction analysis and infrared microscopy. Particlesize-dependent study was performed to reveal the role of mechanically induced defects. The presence of oxygen led to an early formation of a thin surface crystalline layer (smoothly structured) that significantly influenced further crystal growth. The most pronounced consequence was surprisingly found in case of the (GeSe2)(0.3)(Sb2Se3)(0.7) composition that crystallizes in volume. The thin surface crystalline layer hindered the macroscopic viscous flow, so that the samples retained their original shape, and these quasi-stationary conditions accelerated the initial nucleation and growth rates. At the same time, however, these conditions prevented the samples from reaching full crystallinity. In case of the compositions with x = 0.4 and 0.5, the crystal growth proceeded only at the surface and presence of external interfaces and mechanically induced defects took over the major role driving the crystallization kinetics. Correlation of the calorimetric, microscopic and viscosity data is discussed in detail.	Crystallization behavior; Oxygen atmosphere; DSC; XRD; Infrared microscopy; (GeSe(2))(x)(Sb2Se3)(1-x) glasses

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