Initially, Sulfur (S) doping in Se₉₀Te₁₀ glassy alloy was utilized for clarifying the effects produced by minerals on its glass mesh and kinetic characteristics. The crystallization kinetics of bulk Se₉₀Te₁₀ and (Se₉₀Te₁₀)₉₅S₅ with different heating rates were analyzed by the differential scanning calorimetry. The processes of the alloy recrystallization after the thermal treatment were recognized by X-ray diffraction. The activation of energy, E_g, of glass transition crystallization, E_c, was utilized for determining various kinetic models. The analysis and experimental data revealed that E_g and E_C differ for the additive elements. The effective E_c of crystallization was calculated based on the Kissinger formula. Thus, the Sestak–Berggren model was used for characterizing the DSC crystallization information when it agreed to the experimental results. Consequently, it was found that the Johnson–Mehl–Avrami model can be applied at high heating rates.