Publikace detail

Non-isothermal crystallization of (GeS2)(0.1)(Sb2S3)(0.9) chalcogenide glass: Influence of reaction atmosphere

Autoři: Svoboda Roman

Rok: 2016

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Non-Crystalline Solids

Název nakladatele: Elsevier Science BV

Místo vydání: Amsterdam

Strana od-do: 102-108

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Neizotermní krystalizace (GeS2)(0.1)(Sb2S3)(0.9) chalkogenidového skla: vliv reakční atmosféry	DSC, XRD a IČ mikroskopie byly použity pro studium vlivu reakční atmosféry na krystalizační chování prášků sklovitého (GeS2)(0.1)(Sb2S3)(0.9). Bylo zjištěno, že přítomnost kyslíku akceleruje krystalizační proces v závislosti na velikosti částic práškového skla.	krystalizace; reakční atmosféra; DSC; XRD; IČ mikroskopie; (GeS2)(0.1)(Sb2S3)(0.9) sklo
eng	Non-isothermal crystallization of (GeS2)(0.1)(Sb2S3)(0.9) chalcogenide glass: Influence of reaction atmosphere	Differential scanning calorimetry, X-ray diffraction analysis and infrared microscopy were used to investigate the influence of reaction atmosphere (air versus pure nitrogen) on crystallization behavior of (GeS2)(0.1)(Sb2S3)(0.9) powdered and bulk glass. The presence of oxygen was found to accelerate (in comparison to pure N-2) the crystallization process in dependence on particle size of the powdered glass. Large amounts of mechanically induced defects (and not the increased surface area) were found to be the key catalyzing factor. Formal kinetic description of the crystallization mechanism (presented in terms of the nucleation-growth model) remained unchanged by the presence of oxygen. In addition, also the crystallographic nature of the crystalline products was similar for crystallization in air and in pure N-2. Direct observations by infrared microscopy confirmed that the (GeS2)(0.1)(Sb2S3)(0.9) glass crystallizes from surface. These observations also evidenced similar morphology of the crystallites growing in and without presence of oxygen, as well as the more preferential defects-based growth in case of the oxygenated samples. In addition, presence of oxygen was found to partially inhibit the powder sintering above the glass transition temperature.	Crystallization; Reaction atmosphere; DSC; XRD; Infrared microscopy; (GeS2)(0.1)(Sb2S3)(0.9) glass

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