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Publication detail

Thermal properties and viscous flow behavior of As2Se3 glass
Year: 2016
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: 220-228
Titles:
Language Name Abstract Keywords
cze Tepelné vlastnosti a viskozitní chování skelného As2Se3 Tepelná deformace objemových skel As2Se3 vyleštěných na optickou kvalitu byla zkoumána v oblasti podchlazené taveniny pomocí termomechanického analyzátoru. Během neizotermního měření byla měřena výška vzorku v závislosti na aplikovaném zatížení a rychlosti ohřevu. Ze získaných údajů byly stanoveny koeficient tepelné expanze, teplota skelného přechodu, teplota počátku deformace viskozitním tokem a teplota zastavení deformace vlivem růstu krystalů. chalkogenidová skla; krystalový růst; viskozitní tok; termomechanická analýza
eng Thermal properties and viscous flow behavior of As2Se3 glass Thermal deformation of the As2Se3 bulk samples polished to optical quality has been investigated in the undercooled liquid region using thermomechanical analyzer (TMA). During the non-isothermal measurements the change of sample height has been monitored under compression at different heating rates (1-5 degrees C/min). The coefficient of linear thermal expansion, glass transition temperature and two characteristic extrapolated temperatures To, as beginning of sample deformation caused by viscous flow, and Tf, as temperature at which the deformation is stopped by crystal growth and the sample reaches the final height hf, were obtained from TMA measurements. It was found that the value of activation energy obtained from the shift of characteristic temperature Tf with heating rate using the Kissinger method is very close to activation energy of crystal growth obtained by direct monitoring using microscopic methods. The influences of applied force, sample dimensions and heating rate on the overall TMA crystallization curve are discussed. For the first time, theoretical simulations of crystal growth were used to correlate the course of the TMA curve with the direct microscopic observation of the crystallization process. Chalcogenide glasses; Crystal growth; Viscous flow; Thermomechanical analysis

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