Non-isothermal crystallization in amorphous Ga[x]Se100-x nanorods

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  • Non isothermal crystallization in amorphous Ga x Se100 x nanorods

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<jats:p> Thermal properties of amorphous Ga<jats:sub> <jats:italic>x</jats:italic> </jats:sub>Se<jats:sub>100-<jats:italic>x</jats:italic> </jats:sub> (a-Ga<jats:sub> <jats:italic>x</jats:italic> </jats:sub>Se<jats:sub>100-<jats:italic>x</jats:italic> </jats:sub>) nanorods were studied at different heating rates (5, 10, 15, and 20 K/min) using differential scanning calorimetry. It has been observed that the values of glass transition temperature and crystallization temperature vary with composition and heating rate. The activation energy for structural relaxation (Δ<jats:italic>E</jats:italic> <jats:sub>t</jats:sub>), the activation energy of crystallization (Δ<jats:italic>E</jats:italic> <jats:sub>c</jats:sub>) and the order parameter (<jats:italic>n</jats:italic>) were calculated using the heating rate dependence of glass transition temperature and crystallization temperature. Several parameters such as thermal stability parameter (<jats:italic>S</jats:italic>), the crystallization enthalpy (Δ<jats:italic>H</jats:italic> <jats:sub>c</jats:sub>), entropy (Δ<jats:italic>S</jats:italic>) changes during crystallization process and crystallization rate factor (<jats:italic>K</jats:italic> <jats:sub>p</jats:sub>) were calculated to study the thermal stability of these glasses. Whereas the parameters such as Hruby number (<jats:italic>H</jats:italic> <jats:sub>R</jats:sub>) and relaxation time (τ<jats:sub> <jats:italic>T</jats:italic> <jats:sub>g</jats:sub> </jats:sub>) were estimated to understand the glass forming ability (GFA). The fragility index (<jats:italic>F</jats:italic> <jats:sub>i</jats:sub>) for the present glasses was also calculated to ascertain whether these glasses were obtained from kinetically strong-glass-forming (KS) or kinetically fragile-glass forming (KF) liquids. </jats:p>

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