Abstract
The compositional trend of the glass transition temperature (T-g) in AsxSe1-x network glasses (x = 0 to 0.4) is investigated using differential scanning calorimetry. The variation of Tg with As content and the mean coordination number of aged and rejuvenated samples are discussed in terms of proposed theoretical and empirical models. Critical assessment of the applicability of various models to explain the compositional variations of T-g is presented. Evidence of multiple rigidity transitions in the present network glasses is reported and the influence of the long-term physical aging is discussed.