Se-doped GeTe4 glasses for far-infrared optical fibers
| Autor: | Mária Chromčíková, Andrea Černá, Jiří Málek, Marek Liška, Jozef Chovanec, Daniela Brandová, Michal Setnička, Roman Svoboda |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Infrared Analytical chemistry 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention symbols.namesake Differential scanning calorimetry Optics Far infrared law Materials Chemistry Crystallization business.industry Mechanical Engineering Metals and Alloys 021001 nanoscience & nanotechnology 0104 chemical sciences Mechanics of Materials symbols Thermomechanical analysis Relaxation (physics) 0210 nano-technology Glass transition Raman spectroscopy business |
| Zdroj: | Journal of Alloys and Compounds. 695:2434-2443 |
| ISSN: | 0925-8388 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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