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https://open.uns.ac.rs/handle/123456789/28108
Nаziv: | Kinetic analysis of the crystallization processes in glasses of the system Bi-As-S | Аutоri: | Šiljegović Mirjana Lukić-Petrović Svetlana Štrbac Goran Petrović Dragoslav Popescu Mihail |
Ključnе rеči: | chalcogenide glasses, crystal growth, activation energy of crystallization | Dаtum izdаvаnjа: | 2011 | Čаsоpis: | First Central and Eastern Europian Conference on Thermal Analysis and Calorimetry, Book of abrstacts, 1st Central and Eastern European Conference on Thermal Analysis and Calorimetry, Craiova, Romania, 2011, 07.09.-10.09., No 1 | Sažetak: | Kinetic analysis of the crystallization process in Bi4(As2S3)96 and Bi6(As2S3)94 glasses was performed based on DSC curves recorded under non-isothermal measurement conditions. Samples were thermally treated at different heating rates in the temperature range 300-770 K. The activation energy of crystallization E and the pre-exponential factor K0 are determined by the Kissinger method and the characteristic crystallization parameters m and n of investigated glasses by the Matusita method. For both crystallization processes the glass with 4 at.% of Bi is characterized by the mechanism of volume nucleation, which is manifested in the form of two-dimensional growth at the first crystallization process, and as three-dimensional at the second one. On the other hand, in the sample with 6 at.% Bi, the average value of the parameter m is close to one, which indicates one-dimensional crystal growth. Compatibility of the values of the parameters m and n suggests that this sample has a large number of crystallization centers, which do not increase significantly during the thermal treatment. | URI: | https://open.uns.ac.rs/handle/123456789/28108 |
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