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Se-doped GeTe4 glasses for far-infrared optical fibers
Authors: Svoboda Roman | Brandová Daniela | Chromčíkova Mária | Setnička Michal | Chovanec Jozef | Černá Andrea | Liška Marek | Málek Jiří
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Journal of Alloys and Compounds
Publisher name: Elsevier Science SA
Place: Lausanne
Page from-to: 2434-2443
Titles:
Language Name Abstract Keywords
cze Se-dopovaná skla pro infračervená optická vlákna DSC a TMA byly využity pro studium termokinetického chování Ge21SeyTe79-y infračervených skel s obsahem Se do 8 at. %. Kinetika skelného přechodu byla popsána TNM modelem a relaxační pohyb byl interpretován pomocí Ramanovy spektroskopie. Zatímco relaxační kinetika nebyla ovlivněna přídavkem Se, krystalizační změny byly významně ovlivněny složením. Ge-Se-Te skla; skelný přechod; krystalizace; tepelná stabilita; DSC; TMA
eng Se-doped GeTe4 glasses for far-infrared optical fibers Differential scanning calorimetry (DSC) and thermomechanical analysis (TMA) were used to study thermokinetic behavior of Ge21SeyTe79-y infrared glasses (for y up to 8 at.% of Se). Glass transition kinetics was described in terms of the Tool-Narayanaswamy-Moynihan model and the relaxation motions were interpreted using Raman spectroscopy data. Both enthalpy and volume relaxation kinetics were found to be uninfluenced by Se addition. On the other hand, DSC crystallization behavior changed significantly with increasing Se content: initial addition of Se partially delays and decelerates both the initial Te precipitation and the consequent volume-located crystallization of GeTe and Te; additional increase of Se content then further delays and separates the volume-located crystallization processes but the initial surface Te precipitation is no longer affected. From this point of view the fine compositional tuning of basic thermal stability of Ge-Te-Se infrared glasses appears meaningless. On the contrary, glass workability window (determined by means of the TMA crystallization experiments) was found to be significantly affected by Se addition, emphasizing the importance of this type of measurements for the glass technology and material science. The 4 at.% Se content was found optimal with respect to fiber-drawing procedure. Ge-Se-Te glasses; Glass transition; Crystallization; Thermal stability; DSC; TMA

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