Effect of partial substitution of barium oxide by lanthanum oxide on the structure and properties of iron-based aluminosilicate glass

Silica -aluminum borates (SiO 2 -R 2 O 3 -R 2 O-RO-ZrO 2 system) with La 2 O 3 replacing BaO were preparing using the conventional melt quenching process. The impact of substituting BaO with La 2 O 3 on the glass structure was examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Raman. The density, thermal properties, alkali resistance and dielectric properties of the glasses were measured and compared using Archimedes, Differential Scanning Circuit (DSC), Thermal Expansion Calorimetry (TEC), Weight Reduction and Impedance Spectroscopy. The viscosity of the glass system was calculated from the thermal properties and discussed in comparison with the wetting angle at 1000 degrees C. The results showed that the glass does not undergo precipitation. With the increase of La 2 O 3 to BaO substitution, the Q 4 in the glass network structure transforms to Q 0 +Q 1 and Q 2 , causing depolymeriation of the glass structure. This results in an increase in the density of the glass, as well as an increase and subsequent decrease in the thermal expansion coefficient. Additionally, the glass transition temperature and glass softening temperature decrease and then increase, which was due to the high field strength of La 3+ . When substituting 5 wt% of BaO with La 2 O 3 , The glass displayed the lowest dielectric constant and dielectric loss, along with the best alkali resistance. Viscosity calculations showed that the viscosity gradually increases at 1000 degrees C with the increase of La 2 O 3 substitution, which was consistent with the wettability results. The glass components in the 0-5 wt% weight range all satisfy the iron -sealed glass wetting angle requirements.