What question did this study set out to answer?

To explore the thermal behavior of a newly synthesized phase, Cs2B4SiO9, in various conditions.

February 26, 2026Glass Physics and Chemistry0 citations

Thermal Behavior of Cs2B4SiO9

EDE. S. Derkacheva VUV. L. Ugolkov DED. S. Ershov

Key Points

To explore the thermal behavior of a newly synthesized phase, Cs2B4SiO9, in various conditions.
Single-phase sample prepared using solid-phase reaction method.
Thermal behavior analyzed up to 950°C using DSC, TG, and X-ray diffraction.
Comparison made with annealing and quenching methods.
Dilatometry used to measure thermal expansion characteristics.
Cs2B4SiO9 melts incongruently, forming CsBSi2O6.
LCTE measured at 16 × 10–6°C–1 up to 400°C.
LCTE increases to 26 × 10–6°C–1 between 450–600°C.

Abstract

For the first time, a single-phase sample with a stoichiometry of 1 : 2 : 1 (Cs2B4SiO9) is obtained in the Cs2O–B2O3–SiO2 system using the solid-phase reaction method. It is shown that excess silica leads to stabilization of this phase even under conditions of a deficiency of B and Cs. The thermal behavior up to 950°C is investigated using DSC, TG, and X-ray diffraction, in comparison with the annealing and quenching method. It is shown that Cs2B4SiO9 melts incongruently with the formation of CsBSi2O6. According to dilatometry measurements, the average linear coefficient of thermal expansion (LCTE) of Cs2B4SiO9 in the region up to 400°C is 16 × 10–6°C–1 and 26 × 10–6°C–1 in the temperature range of 450–600°C.

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