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<p>This study investigates and compares the structural and thermal properties of six glasses in the Al<sub>2</sub>O<sub>3</sub>–CaO–K<sub>2</sub>O–Li<sub>2</sub>O–Na<sub>2</sub>O–SiO<sub>2</sub> system with varying Li<sub>2</sub>O concentration (0–10&#xa0;mass%). The physicochemical, thermal, and structural characteristics were systematically analyzed. The addition of Li<sub>2</sub>O resulted in a change in glass density ranging from 2.50 to 2.53&#xa0;g cm<sup>-3</sup> and in a decrease of the molar volume (from 61 to 56&#xa0;cm<sup>3</sup> mol<sup>-1</sup>), attributed to the formation of non-bridging oxygens (NBO) and a more compact glass structure. X-ray diffraction confirmed that samples up to 6&#xa0;mass% Li<sub>2</sub>O remained fully amorphous. Differential thermal analysis revealed a decrease in glass transition temperature (<i>T</i><sub>g</sub>) with increasing Li<sub>2</sub>O content and the appearance of exothermic crystallization peaks between 600 and 800&#xa0;°C for glasses containing 8–10&#xa0;mass% Li<sub>2</sub>O. Raman spectroscopy confirmed that Li<sub>2</sub>O acts as a network modifier, breaking Si–O–Si linkages and increasing the intensity of the band at 960&#xa0;cm<sup>−1</sup>, corresponding to Si–O stretching vibrations. The study also highlighted the changes in Q<sub>n</sub> structural units with increasing Li<sub>2</sub>O concentration, leading to enhanced depolymerization and structural distortion of the silicate network.</p>

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The influence of Li2O on the structural and thermal properties of Al2O3–CaO–K2O–Na2O–SiO2 glass

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月30日

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  • Aleksandra Nowicka,
  • Branislav Hruška,
  • Jaroslava Gombárová,
  • Hana Kaňková,
  • Lenka Buňová,
  • Beata Pecušová,
  • Katarína Faturíková,
  • Mariana Švančárková,
  • Anna Prnová,
  • Dušan Galusek,
  • Dagmar Galusková

摘要

This study investigates and compares the structural and thermal properties of six glasses in the Al2O3–CaO–K2O–Li2O–Na2O–SiO2 system with varying Li2O concentration (0–10 mass%). The physicochemical, thermal, and structural characteristics were systematically analyzed. The addition of Li2O resulted in a change in glass density ranging from 2.50 to 2.53 g cm-3 and in a decrease of the molar volume (from 61 to 56 cm3 mol-1), attributed to the formation of non-bridging oxygens (NBO) and a more compact glass structure. X-ray diffraction confirmed that samples up to 6 mass% Li2O remained fully amorphous. Differential thermal analysis revealed a decrease in glass transition temperature (Tg) with increasing Li2O content and the appearance of exothermic crystallization peaks between 600 and 800 °C for glasses containing 8–10 mass% Li2O. Raman spectroscopy confirmed that Li2O acts as a network modifier, breaking Si–O–Si linkages and increasing the intensity of the band at 960 cm−1, corresponding to Si–O stretching vibrations. The study also highlighted the changes in Qn structural units with increasing Li2O concentration, leading to enhanced depolymerization and structural distortion of the silicate network.