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  Global Journal of Analytical Chemistry. Volume 2, Issue 2 (2011) pp. 72-80
  Research Article
Structural and thermal analysis of overlapping phases of Ge0.7Sn0.3Se2.5 Glass
  Deepika*, K. S. Rathore, S. F. Faheem, N. S. Saxena*  
Semiconductor and Polymer Science Laboratory, 5-6, Vigyan Bhawan University of Rajasthan, Jaipur- 302055, India
  Differential scanning calorimetry (DSC) under non-isothermal conditions has been used to study the kinetics of phase transformation in Ge0.7Sn0.3Se2.5 glassy alloy. The crystalline phase observed in DSC thermogram seems to be the overlap of two phases, which have been identified by annealing the samples below first and second crystallization regions. The structural characterization of the as-prepared and annealed glassy alloy has been done through X-ray diffraction (XRD). The activation energy for glass transition as well as crystallization region have been calculated using theoretical models. The effect of annealing on the kinetics parameters of phase transformation such as activation energy of glass transition and crystallization, Avrami exponent and dimensionality of growth has also been studied. The study reveals that Ge0.7Sn0.3Se2.5 glass becomes less stable after annealing.
  Differential Scanning Calorimetry; Phase separation; Annealing; Activation energy  

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