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Thermo-structural characterization of (As2Se3)(100-x)-(As2Te3)(x) glasses for infrared optics
Year: 2019
Type of publication: článek v odborném periodiku
Name of source: Journal of the American Ceramic Society
Publisher name: Wiley-Blackwell
Place: Hoboken
Page from-to: 382-396
Titles:
Language Name Abstract Keywords
cze Termo-strukturní charakterizace (As2Se3)(100-x)-(As2Te3)(x) skel pro infračervenou optiku Diferenciální skenovací kalorimetrie byla použita ke studiu termokinetického chování (As2Se3)(100-x)-(As2Te3)(x) skel pro infračervenou optiku. Relaxace v oblasti skelného přechodu byla popsána na základě fenomenologického TNM modelu a relaxační pohyb byl interpretován za použití dat z Ramanovy spektroskopie. As-Se-Te skla; kinetika krystalizace; DSC; mikroskopie; Ramanova spektroskopie; strukturní relaxace; XRD
eng Thermo-structural characterization of (As2Se3)(100-x)-(As2Te3)(x) glasses for infrared optics Differential scanning calorimetry was used to study thermokinetic behavior of (As2Se3)(100-x)(As2Te3)(x) infrared glasses (seven compositions along the pseudo-binary were investigated). Glass-transition kinetics was described in terms of the Tool-Narayanaswamy-Moynihan model and the relaxation motions were interpreted using Raman spectroscopy data. The enthalpy relaxation kinetics was found to be absolutely uninfluenced by changing Se/Te ratio. On the other hand, DSC crystallization behavior changed significantly with increasing As2Te3 content: Te-rich compositions show marked affinity toward crystallization, whereas in case of the compositions with 0-34 mol.% As2Te3 crystal growth is significantly suppressed. X-ray diffraction analysis indicated presence of monoclinic As2Se3, As2Te3, and As2Se(Te)(3) phases. The complex crystallization behavior occurring in case of the Te-rich compositions was described by superposition of two autocatalytic kinetic signals. Based on the information from infrared microscopy the two overlapping crystallization processes can be attributed to the respective formations of spherulitic and needle-shaped crystallites. Best glass stability was identified in case of the (As2Se3)(66)(As2Te3)(34) composition, which appears to be a potential candidate for optic applications in the far-infrared region of the spectrum. (As2Se3)(100-x)(As2Te3)(x) glass; crystallization kinetics; DSC; IR microscopy; Raman spectroscopy; structural relaxation; XRD

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