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A new silicate-germanate K 2 Y[(Si 3 Ge)O 10 (OH)] was synthesized hydrothermally in a system Y 2 O 3 :GeO 2 :SiO 2  = 1:1:2 (T = 280 °C; P = 90–100 atm.); K 2 CO 3  was added to the solution as a mineralizer. Single-crystal X-ray diffraction experiment was carried out at low temperature (150 K). The unit cell parameters are  a  = 10.4975(4),  b  = 6.9567(2),  c  = 15.4001(6) Å,  β  = 104.894(4)°;  V  = 1086.86(7) Å 3 ; space group is  P  2 1 / c . A novel complex anion is presented by corrugated (Si,Ge) tetrahedral layers connected by couples of YO 6  octahedra into the mixed microporous framework with the channels along  b  and  a  axes, the maximal size of cross-section is ~5.6 Å. This structure has similarity with the two minerals: ring silicate gerenite (Ca,Na) 2 (Y,REE) 3 Si 6 O 18  · 2H 2 O and chain silicate chkalovite Na 2 BeSi 2 O 6 . Six-member rings with 1̅ symmetry as in gerenite are distinguished in the new layer. They are mutually perpendicular to each other and connected by additional tetrahedra. Straight crossing chains in chkalovite change to zigzag four-link chains in the new silicate-germanate layer.

zeitschrift für kristallographie - crystalline materials

Silicate-germanate K 2 Y[(Si 3 Ge)O 10 (OH)] with unusual complex corrugated layer and its correlation to ring silicate gerenite and chain silicate chkalovite