STP1402

    Glass Transformation Studies of Vitreous As2Se3 by Temperature-Modulated DSC

    Published: Jan 2001


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    Abstract

    We have carried out temperature-modulated differential scanning calorimetry (TMDSC) measurements on a typical chalcogenide glass system, As2Se3, which has been well-characterized previously in the literature by conventional DSC. We have studied the behavior of the total and reversing heat flows as the glass is cooled from a temperature above the glass transition temperature, that is, from a liquid-like state. The glass transition temperature Tg was operationally defined as the temperature where the reversing heat flow evinces an inflection point in changing from liquid-like to solid-like behavior. We have studied (a) the dependence of Tg on the cooling rate q under conventional DSC conditions and (b) the dependence of Tg on the modulation period P under TMDSC conditions. These two studies were carried out towards characterizing the glass relaxation kinetics. We have also examined whether Tg shows any dependence on the modulation amplitude A at a given cooling rate.

    Keywords:

    temperature-modulated differential scanning calorimetry (TMDSC), glass transformation, chalcogenide glass, As, 2, Se, 3


    Author Information:

    Kasap, SO
    University of Saskatchewan, Saskatoon,

    Tonchev, D
    University of Saskatchewan, Saskatoon,


    Paper ID: STP10701S

    Committee/Subcommittee: E37.01

    DOI: 10.1520/STP10701S


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