Kinetic analysis of the crystallization of Y 2 O 3 and La 2 O 3 doped Li 2 O-Al 2 O 3 -SiO 2 glass.

Li ₂ O-Al ₂ O ₃ -SiO ₂ (LAS) glass ceramics have a low coefficient of thermal expansion, high mechanical strength, and excellent chemical stability. With advancements in glass ceramics, researchers have explored using LAS glass ceramics with transition metal doping and rare earth doping. Most previous studies have studied the impact of rare earth element doping on crystallization primarily in the context of conventional nucleating agents present in glass. In this study, we aimed to investigate the impact of Y ₂ O ₃ and La ₂ O ₃ on LAS glasses in the presence of undoped nucleating agents. The crystallization mechanism of La ₂ O ₃ and Y ₂ O ₃ doped LAS glass ceramics was studied using differential scanning calorimetry. The crystallization kinetics of the glasses were analyzed using model-free and modeling methods. Moreover, the activation energy of crystallization and the indices of crystallization and growth of glass ceramics were calculated, and the crystalline phase and microstructure of the samples were characterized. All three fractions of the LAS glass showed consistent crystallization under different calculation methods. The glass doped with La ₂ O ₃ and Y ₂ O ₃ exhibited two- or three-dimensional growth during crystallization, promoting crystallization in the LAS glass. The Y ₃ La ₀ sample demonstrated the most favorable crystallization effect. In the presence of an undoped nucleating agent, rare earth elements can enhance glass crystallization; this new idea can be utilized for the development of new materials.
Competing Interests: There are no conflicts to declare.
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