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[M] Structure refinement of quaternary RE-B-C-Si compounds: Y3−x(B12)3(CSi)Si8 (x ≈ 0.96) and Dy3−x(B12)3(CSi)Si8 (x ≈ 0.90) オンラインリソース

著者: (出版日: 2009-07-24)

コレクション: NIMS成果物
形態: オンラインリソース オンラインリソース
言語: 不明
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We refined the crystal structure of quaternary RE-B-C-Si (RE = Y or Dy) compounds Y3-x(B12)3(CSi)Si8 (x ≈ 0.96) and Dy3-x(B12)3(CSi)Si8 (x ≈ 0.90). Both compounds have a trigonal crystal structure with space group Rm (No. 166). They have previously been assigned as ternary RE-B-Si compounds, but we incorporated carbon to the new structure refinements. The refinement for Y3-x(B12)3(CSi)Si8 achieved a final R1 = 0.0288 for 1178 independent reflections with F0 > 4σ(F0) and 0.0431 for all 1484 reflections, and the refinement for Dy3-x(B12)3(CSi)Si8 achieved a final R1= 0.0382 for 2009 independent reflections with F0 > 4σ(F0) and 0.0385 for all 2022 reflections. The new structure refinements suggest the presence of (B12)3-Si-C-(B12)3 units, which, together with two other units, B12 icosahedron cluster and Si8 ethane like cluster, stabilize the RE3-x(B12)3(CSi)Si8 crystal structure.