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Abstract <p>Samples in two ternary Cs<sub>2</sub>O–Al<sub>2</sub>O –SiO<sub>2</sub> and SrO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> systems and in the quaternary Cs<sub>2</sub>O–SrO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> system were prepared using a solid-phase synthesis method from precursors obtained under hydrothermal conditions. Quantitative elemental analysis was performed by X-ray fluorescence spectroscopy, the phase content was determined by X-ray powder diffraction. A comparative stability analysis was carried out using thermogravimetry up to 1500°С. The melting temperature was determined by visual polythermal analysis using a high-temperature microscope. Significant difference in thermal stability of the samples depending on the Cs<sub>2</sub>O content has been observed. Regardless of the ratio of Al<sub>2</sub>O<sub>3</sub> : SiO<sub>2</sub>, the samples with a Cs<sub>2</sub>O content up to 10 mol % have the highest thermal stability, with their mass losses being less than 3%. Higher Cs<sub>2</sub>O concentration increases the melting point: the samples with the least thermal stability due to the cesium vaporization show the highest liquidus temperature up to 1910°C.</p>

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High Temperature Stability in the Cs2O–SrO–Al2O3–SiO2 System

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • I. A. Zvereva,
  • A. Y. Shesherina,
  • A. V. Fedorova,
  • A. A. Selyutin,
  • O. Yu. Sinel’shchikova,
  • V. A. Novakovskiy,
  • V. A. Vorozhtcov,
  • V. L. Stolyarova

摘要

Abstract

Samples in two ternary Cs2O–Al2O –SiO2 and SrO–Al2O3–SiO2 systems and in the quaternary Cs2O–SrO–Al2O3–SiO2 system were prepared using a solid-phase synthesis method from precursors obtained under hydrothermal conditions. Quantitative elemental analysis was performed by X-ray fluorescence spectroscopy, the phase content was determined by X-ray powder diffraction. A comparative stability analysis was carried out using thermogravimetry up to 1500°С. The melting temperature was determined by visual polythermal analysis using a high-temperature microscope. Significant difference in thermal stability of the samples depending on the Cs2O content has been observed. Regardless of the ratio of Al2O3 : SiO2, the samples with a Cs2O content up to 10 mol % have the highest thermal stability, with their mass losses being less than 3%. Higher Cs2O concentration increases the melting point: the samples with the least thermal stability due to the cesium vaporization show the highest liquidus temperature up to 1910°C.