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<p>The glass transition behavior of Se<sub>80</sub>Sb<sub>20</sub> chalcogenide glass was systematically studied as a function of the heating rate (q = 2.5–45&#xa0;K/min) by differential scanning calorimetry (DSC). A systematic increase in the heating rate within the range of 2.5–17.5&#xa0;K/min was observed to induce a slight elevation in the glass transition temperature (Tg), accompanied by a marginal reduction in the fragility index (m) of the studied sample. These changes are primarily attributed to a slight decrease in configurational entropy caused by the increased heating rate. The application of the bond strength–coordination number fluctuation (BSCNF) model to the glass transition process reveals that the observed increase in the “strength” parameter (D) is mainly due to a slight increase in the average bond energy (E<sub>0</sub>Z<sub>0</sub>) of the structural units. The increase in the strength parameter (D) subsequently leads to a partial enhancement in both the glass-forming ability (Hr) and the thermal stability parameter (S) of the composition. These findings indicate a good agreement between the results obtained from the thermodynamic approach and those predicted by the BSCNF model.</p>

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Physical mechanisms of glass formation and relaxation processes in Sb–Se binary chalcogenide glasses

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • R. Alekberov,
  • S. Mekhtiyeva,
  • R. Sadikhli,
  • H. Mammadova,
  • S. Mammadov

摘要

The glass transition behavior of Se80Sb20 chalcogenide glass was systematically studied as a function of the heating rate (q = 2.5–45 K/min) by differential scanning calorimetry (DSC). A systematic increase in the heating rate within the range of 2.5–17.5 K/min was observed to induce a slight elevation in the glass transition temperature (Tg), accompanied by a marginal reduction in the fragility index (m) of the studied sample. These changes are primarily attributed to a slight decrease in configurational entropy caused by the increased heating rate. The application of the bond strength–coordination number fluctuation (BSCNF) model to the glass transition process reveals that the observed increase in the “strength” parameter (D) is mainly due to a slight increase in the average bond energy (E0Z0) of the structural units. The increase in the strength parameter (D) subsequently leads to a partial enhancement in both the glass-forming ability (Hr) and the thermal stability parameter (S) of the composition. These findings indicate a good agreement between the results obtained from the thermodynamic approach and those predicted by the BSCNF model.