What is it about?
SiO2-Li2O-TiO2 glasses with increasing TiO2 were prepared and studied. TiO2 acts as modifier, then former, and nucleating agent, forming lithium silicate, quartz, and lithium titanate phases. CTE ranged 80.83–120.04 × 10⁻⁷/°C. Good thermal, mechanical, and chemical properties suggest commercial potential.
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Why is it important?
This paper's novelty lies in revealing TiO₂'s dual role in SiO₂-Li₂O-TiO₂ glasses: at low content it acts as a network modifier, at high content as a former (TiO₄). TiO₂ also serves as a nucleating agent, inducing silica phases, then segregating as lithium titanate at 15% and 30%. This controls crystallization and tunable CTE (80.83–120.04 × 10⁻⁷/°C), offering commercial potential.
Perspectives
This study offers useful insight into how TiO₂ tunes crystallization and thermal expansion in lithium silicate glasses. The dual modifier/former role is chemically interesting, and the CTE range is practically relevant. However, I'd want more evidence on long-term chemical durability and reproducibility before commercial adoption. The absence of cell or in vivo data limits biomedical claims, though dental or electronic applications look plausible.
Gehan El-Bassyouni
National Research Centre (NRC), Dokki, Cairo, 12622, Egypt
Read the Original
This page is a summary of: Crystallization of the glasses within the SiO2-Li2O-TiO2 system, Materials Chemistry and Physics, January 2022, Elsevier,
DOI: 10.1016/j.matchemphys.2021.125216.
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