Non-isothermal Differential scanning calorimetry (DSC) technique was used to study the kinetics of first order phase transformation in Ge₂₅Se_75-xSb_x glasses. The X-ray diffraction (XRD) technique was employed to investigate the amorphous and crystalline phases in Ge₂₅Se75-xSb_x glasses. From the heating rate dependences of crystallization temperature; the activation energy for crystallization and other kinetics parameters were derived. The temperature difference (T_c - T_g) and T_c is highest for the samples with 6 % of Sb. Hence, Ge₂₅Se₆₉Sb₆ glass is most stable. The enthalpy released is found to be less for Ge₂₅Se₆₉Sb₆ glass which further confirms its maximum stability. The activation energy of crystallization (DELTA E_c) is found to vary with compositions indicating a structural change due to the addition of Sb. The crystallization data are interpreted in terms of recent analyses developed for non-isothermal conditions. The present investigation indicates that both the glass transition and the crystallization processes occur in a single stage.

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