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Thermokinetic behavior of the Al2O3-PbO-B2O3 glasses
Authors: Chromcikova Maria | Svoboda Roman | Hruska Branislav | Osipov Armenak A | Osipova Leyla M | Pecusova Beata | Nowicka Aleksandra | Liska Marek
Year: 2022
Type of publication: článek v odborném periodiku
Name of source: Journal of Non-Crystalline Solids
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: "121230-1"-"121230-11"
Titles:
Language Name Abstract Keywords
cze Termokinetické chování Al2O3-PBO-B2O3 skel Termokinetické chování skel na bázi Al2O3-PBO-B2O3 bylo studováno technikami DSC, XRD a Ramanovou spektroskopií. Kinetika skelného přechodu byla popsána modelem TNM. Pro popis krystalizační kinetiky byly použity modely JMA a Sestak-Bergrren. Kompoziční trendy termokinetického chování byly popsány. Koncept Avramov-Šesták pro teplotní závislost aktivační energie byl úspěšně aplikován a testován. strukturní relaxace; krystalizační kinetika; Avramov-Sestak koncept; Al2O3-PBO-B2O3 skla
eng Thermokinetic behavior of the Al2O3-PbO-B2O3 glasses Thermokinetic behavior of the Al2O3-PbO-B2O3 glassy system was investigated by means of differential scanning calorimetry, X-ray diffraction analysis and Raman spectroscopy. The glass transition kinetics was described in terms of the Tool-Narayanaswamy-Moynihan model. The compositional evolution of the relaxation parameters was explained in terms of the structural changes and movements of the characteristic structural units detected by Raman spectroscopy. Crystal formation in the studied glassy matrices was investigated in dependence on composition and particle size. The crystal growth was suppressed by increasing particle size as well as by increasing Al2O3 content; formation of crystalline boron oxides was replaced by formation of mixed Al2O3/PbO oxides and Pb4B2O7 phase. The nucleation-growth Johnson-Mehl-Avrami model and the empirical autocatalytic model of.Sestak and Berggren were used to describe the complex crystallization kinetics. The Avramov-.Sestak concept of temperature dependent activation energy was successfully applied and tested on the real-life experimental data. The corresponding methodology was critically reviewed. structural relaxation; crystallization kinetics; Avramov-Sestak concept; Al2O3-PbO-B2O3 glasses

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