Effect of Li₂O Doping on Structure and Mechanical Properties of SiO₂-Al₂O₃-MgO Glass

SiO₂-Al₂O₃-MgO glasses doped with 0-3.0wt% Li₂O were prepared by conventional melt quenching technique, and the effects of Li₂O doping amount on thermal property, structural stability and mechanical properties of the glass were investigated. The results show that the doping of Li₂O reduced the softening temperature of the glass effectively. With the increase of Li₂O doping amount, the optical band gap of the glass decreased first and then increased, while the structural stability, thermal stability and mechanical properties increased first and then decreased. When the Li₂O doping amount was 1.0wt%, the glass had the most stable structure and the best bending and compressive properties.