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Einkristalle von Y3F[Si3O10] im Thalenit-Typ

✍ Scribed by Thomas Schleid; Helge Müller-Bunz

Book ID
101302165
Publisher
John Wiley and Sons
Year
1998
Tongue
German
Weight
76 KB
Volume
624
Category
Article
ISSN
0372-7874

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✦ Synopsis

Colourless, diamond-shaped single crystals of Y 3 F[Si 3 O 10 ] (monoclinic, P2 1 /n; a = 730.38(5), b = 1112.47(8), c = 1037.14(7) pm, b = 97.235(6)°, Z = 4) with thalenite-type structure are obtained upon the reaction of YF 3 with Y 2 O 3 and SiO 2 (1 : 4 : 9 molar ratio) in evacuated silica tubes at 700 °C in the presence of CsCl as flux within seven days. The crystal structure consists of triangular [FY 3 ] 8+ cations and catena-trisilicate anions [Si 3 O 10 ] 8± , which exhibit a horseshoeshape resulting from two vertex-shared terminal [SiO 4 ] tetra-hedra with both staggered and eclipsed conformation relative to the central one. The Y 3+ cations have coordination numbers of seven plus one (Y1) or seven (Y2 and Y3), but only one F ± anion belongs to each and vice versa, the remainder ligands being oxygen members of [Si 3 O 10 ] 8± anions.

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