Effect of La2O3 addition on crystallization and properties of Li2O–Al2O3–SiO2 glass-ceramics

La-doped Li2O–Al2O3–SiO2 (LAS) glass-ceramics were prepared by solid phase reaction. Their crystallization, morphologies and properties were investigated. The crystallization temperature of LAS glass-ceramics decreased due to the La2O3 addition. For the La-doped LAS glass, the β-quartz solid solution (s.s.) was initially formed, and then the β-quartz s.s. transformed to β-spodumene at higher temperature. The La2O3 addition played a role of network modifier in the LAS glass altering their network structure. With increasing the La2O3 content, the flexural strength decreased, and the thermal expansion coefficient increased.