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Glass transition and crystallization kinetics of a new chalcogenide-alkali metal \(\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}\) alloy

  • M I Abd-ElrahmanEmail author
  • Y M Bakier
  • A A Abu-Sehly
  • M M Hafiz
Article
  • 56 Downloads

Abstract

A new chalcogenide-alkali metal alloy of \(\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}\) has been prepared by a melt-quench technique. The crystallized phases due to the thermal annealing are observed by X-ray diffraction of the powdered sample. The glass transition and kinetics of crystallization in the \(\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}\) alloy are studied using the differential scanning calorimetric technique under non-isothermal conditions. The activation energy of the glass transition is evaluated by Kissinger and Mahadevan methods. The crystallization activation energy (\(E_{\mathrm{c}}\)) is calculated by isoconversion Friedman methods. The decrease of \(E_{\mathrm{c}}\) with increasing crystallization conversion is attributed to the complex mechanism of the crystallization process. Based on the shape of the characteristic kinetic function, the crystallization growth is found to be a three-dimensional growth from the bulk nuclei. The results show that the conditions of the Sestak–Berggren model are satisfied for describing the crystallization process of the studied \(\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}\) alloy. The parameters M and N involved in this model are calculated and related to the crystallization process.

Keywords

Chalcogenide alkali metal glass transition crystallization kinetics 

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  • M I Abd-Elrahman
    • 1
    Email author
  • Y M Bakier
    • 1
  • A A Abu-Sehly
    • 1
  • M M Hafiz
    • 1
  1. 1.Physics Department, Faculty of ScienceAssiut UniversityAssiutEgypt

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