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Abstract <p>Based on synchronous thermal analysis (TGA–DSC), the structural transformations of high-purity synthetic xerogel SiO<sub>2</sub> is studied during heat treatment in various media (argon, air, and oxygen) in the temperature range of 300–1200°C. Chromatography–mass spectrometry and controlled combustion of the sample in a stream of oxygen show that the removal of organic components occurs predominantly in the temperature range of 400–600°C, but continues up to 1050°C. Analysis of porosity, specific surface area, apparent density, and Raman spectra show that in the range of 1000–1200°C, pores are closed and the structural network of the SiO<sub>2</sub> xerogel is compacted with transition to a glassy state.</p>

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Structural Transformations of High-Purity Xerogel SiO2 in the Temperature Range of 300–1200°C

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. S. Burdina,
  • K. N. Generalova,
  • A. O. Vozyakov,
  • I. V. Ryaposov

摘要

Abstract

Based on synchronous thermal analysis (TGA–DSC), the structural transformations of high-purity synthetic xerogel SiO2 is studied during heat treatment in various media (argon, air, and oxygen) in the temperature range of 300–1200°C. Chromatography–mass spectrometry and controlled combustion of the sample in a stream of oxygen show that the removal of organic components occurs predominantly in the temperature range of 400–600°C, but continues up to 1050°C. Analysis of porosity, specific surface area, apparent density, and Raman spectra show that in the range of 1000–1200°C, pores are closed and the structural network of the SiO2 xerogel is compacted with transition to a glassy state.