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The title compound crystallizes in monoclinic system, space group C2/m with cell dimensions of a=6. 843(2), b=8. 939(2), c=4. 720(1) A, β=101. 77(2), V=282. 7A3, Z=2, Mr=502. 69, Dc=5’ 91 g·cm-3, u(MoKa)=303. 0cm-1, F(000) ~ 440. The structure solution and refinement are based on 869 uniqueobserved reflections with I≥3(I) and the final discrepancy factors converged at R=0. 034, Rw= 0. 042. The structure is considered to be the oxygen atoms packed innearly hexagonal arrangement with rare earth atoms in the octahedral and silicon atomsin tetrahedral holes in alternately parallel layers.
The title compound crystallizes in a monoclinic system with space group C2 / m with cell dimensions of a = 6,843 (2), b = 8,939 (2), c = 4,720 (1) A, β = 101,77 (2), V = 282. 7A3, Z = 2, Mr = 502.69, Dc = 5 ’91 g · cm -3, u (MoKa) = 303.0 cm -1, F (000) Structure solution and refinement are based on 869 uniqueobserved reflections with I ≧ 3 (I) and the final discrepancy factors converged at R = 0. 034, Rw = 0. 042. The structure is considered to be the oxygen atoms packed in nearly hexagonal arrangement with rare earth atoms in the octahedral and silicon atomsin tetrahedral holes in alternately parallel layers.