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Thermokinetic behavior of Ga-doped GeTe4 glasses
Authors: Svoboda Roman | Brandová Daniela | Chromcikova Maria | Liska Marek
Year: 2019
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: 7-14
Titles:
Language Name Abstract Keywords
cze Termokinetické chování Ga-dopovaných GeTe4 skel Termokinetické chování skel GeTe4 dopovaných Ga bylo studováno pomocí DSc a TMA technik. Skelný přechod těchto materiálů byl popsán pomocí TNM modelu, zatímco krystalizační chování bylo nalezeno následovat SB kinetický model. Tepelná stabilita jednotlivých složení byla stanovena. Ge-Ga-Te; skelný přechod; krystalizace; tepelná stabilita; DSC; TMA
eng Thermokinetic behavior of Ga-doped GeTe4 glasses Differential scanning calorimetry (DSC) and thermomechanical analysis (TMA) were used in conjunction to study thermokinetic behavior of (GeTe4)(y)(GaTe3)(100-y) bulk infrared glasses (for y between 40 and 100). The DSC data were utilized to describe the glass transition and crystallization kinetics in terms of the Tool-Narayanaswamy-Moynihan and Sestak-Berggren models, respectively. The kinetic data are of sufficient quality to enable predictions utilizable for preparation of Ge-Ga-Te ceramics and glass-ceramics. Whereas the compositional evolution of the positions of glass transition and crystallization effects was found to be small, the activation energies obtained for the two processes have shown that in case of the crystallization process the applied heating rate q(+) has large influence on the position of the corresponding kinetic peak on the temperature axis (T-c) and, consequently, on the values of glass stability and glass-forming criteria calculated by using this value. For this reason, a new viscous-flow-related criterion, which utilizes the joint DSC and TMA measurements and is independent from applied q(+), was derived to consider the thermal stability of the glassy materials with regard to their processing (fiber-drawing or shape-molding). Based on the newly developed criteria, the (GeTe4)(67)(GaTe3)(33) glass (positioned near the eutectic) was found to be optimal with respect to the fiber-drawing procedure. Ge-Ga-Te glasses; Glass transition; Crystallization; Thermal stability; DSC; TMA

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