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化学学报
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化学学报 ›› 1992, Vol. 50 ›› Issue (10): 983-988. 上一篇    下一篇

研究论文

一种新颖的固态钐硒化物Sm~8S~10的结构研究

董振超;郭国聪;黄锦顺;王曼芳;张乾二;卢嘉锡   

  1. 中国科学院福建物质结构研究所
  • 发布日期:1992-10-15

Structural investigation of a novel solid-state samarium selenide, Sm~8Se~10

DONG ZHENCHAO;GUO GUOCONG;HUANG JINSHUN;WANG MANFANG;ZHANG QIANER;LU JIAXI   

  • Published:1992-10-15

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标题化合物系采用固本法合成得到,化学式为Sm~8Se~10,四方晶系,I4~1/a空间群系,晶胞参数:结构精修收敛后一致性因子R=0.071,R~W=0.067.化合物中稀土钐的配位多面体系由畸变三方柱演化而来,八个Sm原子构成类S~4N~4的笼状八元环,这些八元环沿晶轴C方向呈现出规整的排列结构.结构数据分析和电阻率测量表明Sm~8Se~10具有价态涨落现象,是量个混合价化合物.

关键词: 晶体结构, 固相合成, 稀土, 笼状结构, 钐硒化物

Sm8Se10 (k-phase) was prepared by solid-state reaction followed by chem. transport reaction. It crystd. as tetragonal, space group I41/a, a 1.2000(7), c 1.4075(30) nm, Z = 4, R = 0.071, Rw = 0.067. The coordination polyhedra around the Sm atoms are derived from distorted triangular prisms. A cage 8-membered ring formed by 8 Sm atoms is similar to that of S4N4. The projection of these Sm8 rings along the c direction exhibits a regular array. Structural parameter anal. and elec. resistivity measurements indicate that Sm8Se10 is a mixed-valence rare earth compound

Key words: CRYSTAL STRUCTURE, SOLIDPHASE SYNTHESIS, RARE EARTH, CAGE STRUCTURE

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