Investigation of Crystallization Kinetics of Na ₂ ZnP ₂ O ₇ Glass Using XRD and DTA Analysis

Abstract In the present investigation, the crystallization kinetics of a glass with a molar composition 25Na 2 O‐25ZnO‐50P 2 O 5 (NZPO) is studied by means of a non‐isothermal differential thermal analysis (DTA) and X‐ray diffraction (XRD) techniques. XRD pattern of the as‐synthesized glass indicates an amorphous glassy structure without additional crystalline phase. Moreover, the heat‐treated glass sample shows the crystallization of the Na 2 ZnP 2 O 7 crystalline phase. The glass transition peak temperature increases with increasing heating rates and is ranged from 505.3 to 601.6 K. The crystallization shows the same behavior and the obtained values are ranged from 685.2 to 731.2 K. The activation energies for glass transition and crystallization are determined using different approaches and are in the range of 25.9–30.5 and 82.8–112.0 kJ mol −1 , respectively. The n and m kinetic parameters are each close to 3.0, which indicates bulk nucleation process with 3D growth of crystals.