Local structure characterization and thermal properties of P2O5MgONa2OLi2O glasses doped with SiO2

•The effect of silica-doping on structure of P2O5MgONa2OLi2O glass is existing.•With the increase of SiO2 content, the number of bridge oxygen increases.•With the addition of SiO2, the polymerization degree of the structure increases.•These glass density and molar volume gradually decline with the increasing of SiO2.•The silica participate in the network formation, and improve the thermal stability.

Pure and SiO2 doped P2O5MgONa2OLi2O glass has been prepared by the traditional melt quenching and heat treatment techniques. Via X-ray diffraction (XRD) patterns, all the samples are proved to be amorphous. Field emission scanning electron microscopy (FESEM) and macroscopic observation show that all the samples are homogeneous glasses and no phase splitting phenomenon. Fourier transform infrared (FTIR) spectrum shows that the amount of non-bridging oxygen decreases and the polymerization degree of the glass network structure increases after introducing SiO2 into glasses. Meanwhile, density and molar volume gradually decline with the increasing of SiO2. The glass transition (Tg) and the first crystallization temperature (Tc) indicates thermal stability increases in SiO2 added glasses.

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