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The title compounds were synthesized via reaction of quartz and AO 2  (A = Rb, Cs) with the elemental alkali metals. Their crystal structures were determined on the basis of single crystal X-ray data. All compounds crystallize in the monoclinic system with space group P2 1 /c and lattice constants a = 656.0(l)/684.7(3), b = 1329.7(3)/1375.7(4), c = 1647.6(3)/1703.6(8) pm, β = 107.78(3)/108.23(2)°, Z = 4 (A 6 [Si 3 O 9 ], A = Rb/Cs) and a = 668.59(8)/711.4(1), b = 911.37(9)/952.1(2), c = 1121.09(9)/1192.7(7) pm, β = 125.52(9)/126.22(3)°, Z = 2(A 6 [Si 2 O 7 ], A = Rb/Cs) respectively. The rubidium and cesium compounds are isotypic with the corresponding potassium silicates.

zeitschrift für naturforschung b

Alkalimetall-Oxosilicate A 6 [Si 3 O 9 ] und A 6 [Si 2 O 7 ] (A = Rb, Cs): Darstellung und Kristallstruktur/ The Alkaline Metal Oxo-Silicates A 6 [Si 3 O 9 ] and A 6 [Si 2 O 7 ] (A = Rb, Cs): Preparation and Crystal Structure