Gallium-Indium Ordering in the Complex [Ni2Ga3In] Network of GdNi2Ga3In

详细信息    查看全文

• 作者：Yaroslav V. Galadzhun ; Myroslava M. Horiacha ; Galyna P. Nychyporuk ; Ute Ch. Rodewald ; Rainer Pö ; ttgen and Vasyl I. Zaremba
• 刊名：Zeitschrift f蹲 anorganische und allgemeine Chemie
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：642
• 期：16
• 页码：896-901
• 全文大小：644K
• ISSN：1521-3749

文摘

Polycrystalline samples of the isotypic quaternary compounds <em>REem>Ni₂Ga₃In (<em>REem> = Y, Gd – Tm) were obtained by arc-melting of the elements. Crystals of the gadolinium compound were found by slow cooling of an arc-melted button of the initial composition “GdNiGa₃In”. All samples were characterized by powder X-ray diffraction. The structure of GdNi₂Ga_2.89In_1.11 was refined from single-crystal X-ray diffractometer data: new type, <em>Pnmaem>, <em>aem> = 2426.38(7), <em>bem> = 418.17(2), <em>cem> = 927.27(3) pm, <em>wRem>₂ = 0.0430, 1610 <em>Fem>² values and 88 variables. Two of the six crystallographically independent gallium sites show a small degree of Ga/In mixing. The nickel atoms show tricapped trigonal prismatic coordination by gadolinium, gallium, and indium. Together, the nickel, gallium, and indium atoms build up a complex three-dimensional [Ni₂Ga₃In]^δ– network, which leaves cages for the gadolinium atoms. The indium atoms form zigzag chains with In–In distances of 337 pm. The crystal chemical similarities of the polyhedral packing in the GdNi₂Ga₃In and La₄Pd₁₀In₂₁ structures are discussed.