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<p>This study aims to develop transparent sodium aluminosilicate (NAS) glass–ceramics, requiring simultaneous optimization of crystallinity, optical transparency, and mechanical performance. We investigated the influence of Na<sub>2</sub>O/Al<sub>2</sub>O<sub>3</sub> molar ratios (NAMR) and thermal treatment parameters on the structural evolution and properties of glasses. Transparent glass–ceramics were successfully prepared through optimized one-step and two-step crystallization protocols. In the first step of this process, the parent glass was nucleated, and in the second step, it underwent recrystallization. This approach served to enhance the crystallinity while precisely controlling the growth of nepheline crystal grains. The optimized glass–ceramic demonstrated remarkable mechanical enhancement over the parent glass: Vickers hardness increased from 583.6 to 643.8 HV, elastic modulus from 75.4 to 84.4 GPa, indentation fracture toughness from 0.6 to 0.9&#xa0;MPa·m<sup>1</sup>/<sup>2</sup>, and crack initiation resistance from 1.19 to 2.08 N. This work establishes a viable pathway for fabricating glass–ceramics that combine high crystallinity with excellent transparency and superior mechanical properties.</p> Graphical Abstract <p></p>

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Crystallization and properties of La2O3 contained sodium aluminosilicate transparent glass–ceramics

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Jiayu Yang,
  • Wenqiang Wang,
  • Feifan Gong,
  • Yuan Wu,
  • Dongliang Zhang,
  • Mitang Wang

摘要

This study aims to develop transparent sodium aluminosilicate (NAS) glass–ceramics, requiring simultaneous optimization of crystallinity, optical transparency, and mechanical performance. We investigated the influence of Na2O/Al2O3 molar ratios (NAMR) and thermal treatment parameters on the structural evolution and properties of glasses. Transparent glass–ceramics were successfully prepared through optimized one-step and two-step crystallization protocols. In the first step of this process, the parent glass was nucleated, and in the second step, it underwent recrystallization. This approach served to enhance the crystallinity while precisely controlling the growth of nepheline crystal grains. The optimized glass–ceramic demonstrated remarkable mechanical enhancement over the parent glass: Vickers hardness increased from 583.6 to 643.8 HV, elastic modulus from 75.4 to 84.4 GPa, indentation fracture toughness from 0.6 to 0.9 MPa·m1/2, and crack initiation resistance from 1.19 to 2.08 N. This work establishes a viable pathway for fabricating glass–ceramics that combine high crystallinity with excellent transparency and superior mechanical properties.

Graphical Abstract