Crystallization kinetics determination of Pb15Ge27Se58 chalcogenide glass by using the various heating rates (VHR) method

Abstract The kinetics of crystallization of Pb 15 Ge 27 Se 58 was studied by differential scanning calorimetry non-isothermally. Various experimental methods are currently employed for determining the kinetic parameters of crystallization in a glassy system. These parameters include the activation energy of crystallization E (kJ/mol), the kinetic exponent n and the frequency factor K o (s −1 ). Recently, a new method (VHR method) has been derived from Johnson–Mehl–Avrami (JMA) transformation rate equation to calculate – in sequence – the crystallization kinetic parameters of a glassy system. The VHR technique has been used to estimate the crystallization parameters of Pb 15 Ge 27 Se 58 chalcogenide glass under non-isothermal conditions. The average value of E , n and K o are found equal to 181.74 ± 0.58 (kJ/mol), 1.085 ± 0.023 and (9.196 ± 0.716) × 10 12 (s −1 ), respectively. The kinetic exponent, n ≈ 1 indicates a surface nucleation mechanism.