Silicogermanate Ba2K2In2[(Si0.8Ge0.2)6O18] · 2H2O As an Analogue of the Natural Zirconosilicate Kostylevite K4Zr2[Si6O18] · 2H2O

• Published in: Crystallography reports Vol. 65; no. 5; pp. 711 - 715
• Main Authors: Reutova, O. V., Belokoneva, E. L., Dimitrova, O. V., Volkov, A. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.09.2020; Springer Nature B.V
• Subjects: Crystallography and Scattering Methods; Germanium; Hydrothermal crystal growth; Physics; Physics and Astronomy; Silicon; Structure of Inorganic Compounds; Tetrahedra; Zirconium
• ISSN: 1063-7745; 1562-689X
• DOI: 10.1134/S1063774520050193

Crystals of new silicogermanate Ba 2 K 2 In 2 [(Si 0.8 Ge 0.2 ) 6 O 18 ] · 2H 2 O were prepared by the hydrothermal synthesis; sp. gr. P 2 1 / n , a = 6.5548(6) Å, b = 11.6946(10) Å, c = 13.0203(11) Å, β = 102.774(1)°. This compound is structurally similar to the natural zirconosilicate kostylevite K 4 Zr 2 [Si 6 O 18 ] · 2H 2 O (sp. gr. P 2 1 / c ), in which Zr atoms are replaced by In atoms, K atoms are partially replaced by Ba atoms, and Ge atoms are isomorphously incorporated into SiO 4 tetrahedra. The six-membered tetrahedral rings composed of (Si,Ge)O 4 tetrahedra are linked by InO 6 octahedra to form a mixed framework, with large cations located in the cavities. The difference in the space group designation is only in the choice of the coordinate axes and, correspondingly, in the setting of the same monoclinic space group.