Powder X-Ray Diffraction Data on Polymorphism of RbBSi2O6 and Crystal Structure of Its High-Temperature Modification


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Abstract

Structural deformations and phase transformations of Rb-boroleucite RbBSi2O6 obtained by crystallization from glass at 1000 °C are studied by high-temperature X-ray powder diffraction and differential scanning calorimetry in the range 25–1200 °C. At 345 °C the compound undergoes a reversible cubic-cubic polymorphic transition with increasing symmetry \(I\bar 43d \leftrightarrow Ia\bar 3d\). The crystal structure of RbBSi2O6 is refined by the Rietveld method at temperatures of 25 °C, 100 °C, 200 °C, 300 °C, 310 °C, 320 °C, 330 °C, 340 °C, 350 °C, 360 °C, 380 °C, 400 °C, 500 °C, 600 °C, 700 °C, 800 °C, and 900 °C, according to the powder X-ray diffraction data.

About the authors

M. G. Krzhizhanovskaya

Institute of Earth Sciences

Author for correspondence.
Email: mariya.krzhizhanovskaya@spbu.ru
Russian Federation, St. Petersburg

R. S. Bubnova

Institute of Earth Sciences; Institute of Silicate Chemistry

Email: mariya.krzhizhanovskaya@spbu.ru
Russian Federation, St. Petersburg; St. Petersburg

S. K. Filatov

Institute of Earth Sciences

Email: mariya.krzhizhanovskaya@spbu.ru
Russian Federation, St. Petersburg

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