Abstract
The crystal structures are determined for KDy[AlSi4O12]·0.41H2O and KTb[AlSi4O12]·0.32 H2O compounds synthesized under hydrothermal conditions, which crystallize in the space group C2/c with the unit cell parameters a = 26.6956(6) A and 26.619(1) A, b = 7.2477(2) A and 7.2553(3) A, c = 14.7705 A and 14.8200(6) A, β = 123.7721° and 123.5149° for KDy and KTb aluminosilicates respectively. Tetrahedral layers in the structures of the studied crystals differ in their packing order and can be matched in space with a twofold rotational symmetry axis. In the studied phases Dy and Tb present in a trivalent form.
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