EFFECT OF Y₂O₃ ON THE STRUCTURE, THERMAL STABILITY AND ELASTIC MODULUS OF MAGNESIUM ALUMINOSILICATE GLASSES

The structure, thermal stability and elastic modulus of MgO-Al₂O₃-SiO₂ glasses doped with Y₂O₃ were studied by using XRD, FT-IR, density, DSC, and elastic modulus tests. The results showed that the glass samples remained amorphous with the addition of Y₂O₃. Moreover, the FT-IR results indicated that with an increase in the Y₂O₃ content, the overall change in the degree of polymerisation of the glass network structure showed an increasing trend. The Tg and first crystallisation peak Tp1 of the glasses significantly increased, and the thermal stability was enhanced. As the Y₂O₃ content increased, the densities of the glasses increased from 2.59g/cm³ to 2.88g/cm³. At the same time, the elastic modulus of glasses increased from 98.06 GPa to 107.77 GPa.