1. Crystallization and mechanical properties of a barium titanosilicate glass.
- Author
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Mezeix, Pierre, To, Theany, Houizot, Patrick, Célarié, Fabrice, and Rouxel, Tanguy
- Subjects
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GLASS-ceramics , *CRYSTALLIZATION , *GLASS transition temperature , *BARIUM , *YOUNG'S modulus , *PIEZOELECTRIC devices - Abstract
Glasses and glass–ceramics from the BaO–TiO2–SiO2 systems have potential applications in piezoelectric and photonic devices. However, more studies on their crystallization and mechanical properties are needed to put the materials into service. In this work, seven grades of glasses with 30BaO–xTiO2–(70-x)SiO2 (mol%) were prepared. The crystallization behavior and mechanical properties were investigated. The 30BaO–20TiO2–50SiO2 glass composition, possessing a glass transition temperature of 759 °C and a crystallization onset temperature of 877 °C, shows a prominent surface nanocrystallization. Heat treatments at 800 °C for different durations result in various depths for the crystalline phase layer. Depths of about 1 µm and 200 µm were obtained by heat treatments for 3 h and 70 h, respectively. The nucleation rate is found to be around 1016 to 1018 m−3 s−1, which is comparable to that of the fresnoite stoichiometric composition (Ba2TiSi2O8). The hardness and Young's modulus of the crystalline layer are about 100% and 50%, respectively, higher than those of the parent glass. The fracture behavior of this layer is highly anisotropic, as a result of the crystallization texture. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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