Thermal properties and viscous flow behavior of As sub(2)Se sub(3) glass

Thermal deformation of the As sub(2)Se sub(3) 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 he...

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Bibliographic Details
Published in:Journal of alloys and compounds 2016-01, Vol.655, p.220-228
Main Authors: Zmrhalova, Zuzana, Pilny, Petr, Svoboda, Roman, Shanelova, Jana, Malek, Jiri
Format: Article
Language:English
Subjects:
Activation energy
Arsenides
Crystal growth
Crystallization
Deformation
Heating rate
Thermal expansion
Viscous flow
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Summary:Thermal deformation of the As sub(2)Se sub(3) 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 T sub()0 as beginning of sample deformation caused by viscous flow, and T sub()f as temperature at which the deformation is stopped by crystal growth and the sample reaches the final height h sub()fwere 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.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2015.09.193