Ring Silicates Cs4Tm2[Si4O12](OH)2 and Cs4(Tm,Tb)2[Si4O12](OH)2 As Merohedral Twins

New ring silicates Cs 4 Tm 2 [Si 4 O 12 ](OH) 2 and Cs 4 (Tm,Tb) 2 [Si 4 O 12 ](OH) 2 have been synthesized by the hydrothermal method. A structural analogy is revealed between them and the previously studied silicates K 4 Sc 2 (OH) 2 (Si 4 O 12 ) and K 2 Sc[Si 2 O 6 ]F. Their crystal structures are...

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Bibliographic Details
Published in:Crystallography reports 2023-02, Vol.68 (1), p.24-30
Main Authors: Bolotina, N. B., Topnikova, A. P., Belokoneva, E. L., Dimitrova, O. V., Volkov, A. S., Zorina, L. V.
Format: Article
Language:English
Subjects:
Crystallography and Scattering Methods
Hydrothermal crystal growth
Physics
Physics and Astronomy
Silicates
Structure of Inorganic Compounds
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Summary:New ring silicates Cs 4 Tm 2 [Si 4 O 12 ](OH) 2 and Cs 4 (Tm,Tb) 2 [Si 4 O 12 ](OH) 2 have been synthesized by the hydrothermal method. A structural analogy is revealed between them and the previously studied silicates K 4 Sc 2 (OH) 2 (Si 4 O 12 ) and K 2 Sc[Si 2 O 6 ]F. Their crystal structures are identified as orthorhombic merohedral twins by the lost element of tetragonal symmetry. The structures of new ring silicates are related to those of fresnoite and tetragonal melilite.
ISSN:1063-7745
1562-689X
DOI:10.1134/S1063774523010054