Crystallization kinetics of Ag-doped Se–Bi–Te chalcogenide glasses
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Effect of Ag doping on the crystallization kinetics of amorphous Se80.5Bi1.5Te18−yAgy (for y = 0, 1.0, 1.5, and 2.0 at.%) glassy alloys has been studied by differential scanning calorimetry (DSC). The DSC curves recorded at four different heating rates are analyzed to determine the transition temperature, activation energy, thermal stability, glass forming ability, and dimensionality of growth during phase transformation. Present study shows that the thermal stability and the glass-forming ability increase with an increase in the Ag content which is in agreement with the earlier studies. Our results show that Se80.5Bi1.5Te16Ag2 composition is thermally more stable and has a little tendency to crystallize in comparison to other compositions under study. The increase in thermal stability with increasing Ag concentration is attributed to an increase in the cohesive energy.
KeywordsChalcogenide glasses Glass transition Thermal stability Glass forming ability Non-isothermal Avrami exponent
We are thankful to Prof. Kulvir Singh, Thaper University Patiala, for scanning our samples on Diamond Pyris (Perkin Elmer) DSC and valuable suggestions regarding the work.
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