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<p>The effect of K<sub>2</sub>O on the thermal, structural, and mechanical properties of 43SiO<sub>2</sub>-25CaO-(25-x) Na<sub>2</sub>O-xK<sub>2</sub>O-7P<sub>2</sub>O<sub>5</sub> (<i>x</i> = 5, 10, and 15) glasses is investigated. The initial raw materials are taken from agro-food wastes and conventional chemicals. The non-isothermal study is carried out using DTA to estimate the crystallization behavior of as-prepared glasses. The activation energies for glass transition and crystallization are calculated using both model-based and model-free approaches. The activation energy is increased with K<sub>2</sub>O content in the glass composition, i.e., ~ 290–468&#xa0;kJ&#xa0;mol<sup>−1</sup>. Raman spectroscopy revealed that some fraction of the NBO’s is converted into BO’s with the concentration of K<sub>2</sub>O. The Avrami parameters and the theoretical master plots indicate the increasing tendency of surface crystallization instead of volume crystallization with K<sub>2</sub>O content. The thermal expansion coefficient (TEC) is decreased with K<sub>2</sub>O, i.e., 17 × 10<sup>–6</sup> to 10 × 10<sup>–6</sup>/°C. Contrary to this, the hardness is increased.</p>

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Non-isothermal crystallization kinetics study of Na2O-K2O-CaO-SiO2 glasses derived from hybrid resources

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Navneet Kaur Mattu,
  • K. Singh

摘要

The effect of K2O on the thermal, structural, and mechanical properties of 43SiO2-25CaO-(25-x) Na2O-xK2O-7P2O5 (x = 5, 10, and 15) glasses is investigated. The initial raw materials are taken from agro-food wastes and conventional chemicals. The non-isothermal study is carried out using DTA to estimate the crystallization behavior of as-prepared glasses. The activation energies for glass transition and crystallization are calculated using both model-based and model-free approaches. The activation energy is increased with K2O content in the glass composition, i.e., ~ 290–468 kJ mol−1. Raman spectroscopy revealed that some fraction of the NBO’s is converted into BO’s with the concentration of K2O. The Avrami parameters and the theoretical master plots indicate the increasing tendency of surface crystallization instead of volume crystallization with K2O content. The thermal expansion coefficient (TEC) is decreased with K2O, i.e., 17 × 10–6 to 10 × 10–6/°C. Contrary to this, the hardness is increased.