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<p>In this work, MgO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> (MAS) glass–ceramics were prepared via the fusion and heat treatment method, and the effects of Li<sub>2</sub>O content (0–4&#xa0;mol%) on the crystallization behavior, microstructure, and optical-dielectric-mechanical properties were systematically investigated. The results revealed that the dominant crystalline phase of the MAS glass–ceramic was Mg<sub>0.6</sub>Al<sub>1.2</sub>Si<sub>1.8</sub>O<sub>6</sub>, while the introduction of Li<sub>2</sub>O induced the precipitation of Li<sub><i>x</i></sub>Al<sub><i>x</i></sub>Si<sub>1-<i>x</i></sub>O<sub>2</sub> crystals. Furthermore, when the Li<sub>2</sub>O content exceeded 1&#xa0;mol% and the crystallization temperature was above 900&#xa0;°C, the formation of spinel phases (MgAl<sub>2</sub>O<sub>4</sub> and ZnAl<sub>2</sub>O<sub>4</sub>) was additionally promoted. Through precise control of Li<sub>2</sub>O content and heat treatment parameters, L2 containing 2&#xa0;mol% Li<sub>2</sub>O, after nucleation at 800&#xa0;°C for 10&#xa0;h followed by crystallization at 930&#xa0;°C for 1&#xa0;h, exhibited the best overall balance of optical, dielectric, and mechanical properties: an average visible light transmittance of 80.4%, a dielectric constant of 3.97 and dielectric loss of 3.2 × 10⁻<sup>3</sup> at 1&#xa0;MHz, and a Vickers hardness and flexural strength of 8.24 GPa and 195&#xa0;MPa, respectively.</p>

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Effects of Li2O on crystallization and properties of MgO–Al2O3–SiO2 glass–ceramics

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Yue Zhao,
  • Yu Rao,
  • Hongfa Zhang,
  • Qiwan Mou,
  • Lincan Zhou,
  • Ping Lu

摘要

In this work, MgO–Al2O3–SiO2 (MAS) glass–ceramics were prepared via the fusion and heat treatment method, and the effects of Li2O content (0–4 mol%) on the crystallization behavior, microstructure, and optical-dielectric-mechanical properties were systematically investigated. The results revealed that the dominant crystalline phase of the MAS glass–ceramic was Mg0.6Al1.2Si1.8O6, while the introduction of Li2O induced the precipitation of LixAlxSi1-xO2 crystals. Furthermore, when the Li2O content exceeded 1 mol% and the crystallization temperature was above 900 °C, the formation of spinel phases (MgAl2O4 and ZnAl2O4) was additionally promoted. Through precise control of Li2O content and heat treatment parameters, L2 containing 2 mol% Li2O, after nucleation at 800 °C for 10 h followed by crystallization at 930 °C for 1 h, exhibited the best overall balance of optical, dielectric, and mechanical properties: an average visible light transmittance of 80.4%, a dielectric constant of 3.97 and dielectric loss of 3.2 × 10⁻3 at 1 MHz, and a Vickers hardness and flexural strength of 8.24 GPa and 195 MPa, respectively.