Abstract
Solid solutions K1 − xCsxBSi2O6 (x (atomic fraction) = 0.00, 0.20, 0.30, 0.35, 0.40, 0.80, 0.90,1.00) have been prepared by solid-phase synthesis and crystallization of glasses in the KBSi2O6-CsBSi2O6 borosilicate series. The thermal behavior of the solid solutions has been investigated using the annealing and quenching techniques, dilatometry, and high-temperature X-ray powder diffraction. It has been shown that solid solutions with x = 0.00–0.35 and 0.40–1.00 correspond to space groups I\( \bar 4 \) 3d and Ia\( \bar 3 \)d, respectively. The cubic-cubic phase transition I\( \bar 4 \) 3d ai Ia\( \bar 3 \)d occurs in the composition range x = 0.35−0.40 at room temperature. In the series of solid solutions with x = 0−0.30, the reversible cubic-cubic polymorphic transition I\( \bar 4 \) 3d ai ia\( \bar 3 \)d with an increase in the temperature has been revealed, the temperature of the polymorphic transition has been determined, and the thermal expansion in both polymorphic modifications has been studied using high-temperature X-ray diffraction and dilatometry. The solid solutions belonging to the space group Ia\( \bar 3 \)d are characterized by a lower thermal expansion than the solid solution belonging to the space group I\( \bar 4 \) 3d. According to the calculations, the equivalents α/γ for the space groups I\( \bar 4 \) 3d and Ia\( \bar 3 \)d are 0.03 and 0.02 (in cesium atomic fractions per degree Celsius), respectively.
Published Version
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