Abstract
Bulk Se80Te20 and Se80Sb20 glasses were prepared using the melt–quench technique. Differential scanning calorimetry (DSC) curves measured at different heating rates (5 K/min≤α≤50 K/min) and X-ray diffraction (XRD) are used to characterize the as-quenched specimens. Based on the obtained results, the activation energy of glass transition and the activation energy of crystallization (E g, E c) of the Se80Te20 glass are (137.5, 105.1 kJ/mol) higher than the corresponding values of the Se80Sb20 glass (106.8, 71.2 kJ/mol). An integer n value (n=2) of the Se80Te20 glass indicates that only one crystallization mechanism is occurring while a non-integer exponent (n=1.79) in the Se80Sb20 glass means that two mechanisms are working simultaneously during the amorphous–crystalline transformations. The total structure factor, S(K), indicates the presence of the short-range order (SRO) and the absence of the medium-range order (MRO) inside the as-quenched alloys. In an opposite way to the activation energies, the values of the first peak position and the total coordination number (r 1, η 1), obtained from a Gaussian fit of the radial distribution function, of the Se80Te20 glass are (2.42 nm, 1.99 atom) lower than the corresponding values (2.55 nm, 2.36 atom) of the Se80Sb20 specimens.
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Moharram, A.H., Abu El-Oyoun, M. & Abdel-Baset, A.M. Thermal kinetics and short range order parameters of Se80X20 (X = Te, Sb) binary glasses. Appl. Phys. A 115, 1025–1032 (2014). https://doi.org/10.1007/s00339-013-7936-4
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DOI: https://doi.org/10.1007/s00339-013-7936-4