Non-isothermal crystallization and spectroscopic study of Na2Pb1-xNixP2O7 (0≤x≤1) glasses

•The contribution of Nickel on thermal and structural properties of the glasses was evaluated and discussed.•Different models used and calculated activation energy for crystallization.•The growth and nucleation mechanisms of the vitreous matrix depend on the temperature and the composition of the glasses.•The decrease of Avrami index with temperature, reflects a deceleration of the nucleation kinetics and suggests a predominant growth kinetic at high temperature. Glasses Na2Pb1-xNixP2O7 (0≤x≤1mol. %) have been prepared using the standard melt quench method. The X-ray diffraction pattern shows that all the samples are amorphous. The crystallized phases in the annealed glasses have been identified. The DSC analysis confirmed the glasse's state of the elaborated compounds. IR and Raman results indicated that NiO acts as a vitreous network former and leads to the polymerization of the diphosphate units to form metaphosphates and ultraphosphates groups depending on the composition of the glasses. The kinetic mechanisms and the crystallization parameters of the glasses were investigated. The Avrami index n decreases with temperature. The values of activation energies calculated from the Kissinger and Ozawa models seem to reflect a devitrification tendency comparable to the standard glasses. However, the growth process activation energy calculated using the Matusita and Sakka method, depend closely on the nickel content in the studied glasses.