中华医学超声杂志

应用化学 ›› 1985, Vol. 0 ›› Issue (4): 42-46.

• 研究论文 • 上一篇    下一篇

La6NiSi2S14与La6CoSi2S14的合成及其晶体结构

金钟声, 李卓棠, 杜有如   

  1. 中国科学院长春应用化学研究所
  • 收稿日期:1984-09-21 修回日期:1985-04-24 出版日期:1985-12-10 发布日期:1985-12-10

SYNTHESIS AND THE CRYSTAL STRUCTURE OF La6 NiSi2 S14 AND La6 CoSi2 S14

Jin Zhongsheng, Li Zhuotang, Du Youru   

  1. Changchun Institute of Applied Chemistry, Academia Sinica
  • Received:1984-09-21 Revised:1985-04-24 Published:1985-12-10 Online:1985-12-10

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摘要： La6NiSi2S14与La6CoSi2S14单晶是利用助熔剂法在1100℃下合成的。它们皆属于六方晶系,P63空间群。a=10.293(1)[10.290(2)] Å,c=5.744(1)[5.763(2)]Å,Z=1。627[629]条反射(I≥2.5σ(I))参加计算,R=0.0363[0.0781]。La在扭曲的二帽三角棱柱内,与S八配位,La-S平均键长为2.990[2.992]Å。Ni[Co](处于B位)在三角反棱柱里,与S六配位,Ni[Co]-S健长三个是2.559[2.529]Å,其余三个为2.650[2.679]Å,其占有率约为1/6。Si(处于C位)在四面体内,与S四配位,在Si-S键长中三个是2.130[2.146]Å.第四个键长是2.098[2.093]Å。

Abstract: Single crystals of La6NiSi2S14 and La6CoSi2S14 were obtained by flux growth method at 1100℃.They belong to the hexagonal system, P63,a=10.293(1)[10.290(2)]; c=5.774(1) [5.763(2)Å,Z=1 and R=0.036[0.0959] for 627[629] reflections (I≥2.5σ(Ⅰ)).La is 8-coordinated in a distorted dicapped triangular prism with an average La-S distance 2.990[2.992]Å.Ni[Co] (B site) is in a trigonal antiprism of 6S (three Ni[Co]-S have distance of 2.559[2.529] Å and the other three have distance of 2.650[2.679]Å with 1/6 occupancy.Si(C site) is in a tetrahedron and coordinated with S2 at distance of 2.130[2.146]Å and coordinated with S3 at 2.098[2.093]Å.

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