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Gallium‐Indium Ordering in the Complex [Ni 2 Ga 3 In] Network of GdNi 2 Ga 3 In
Author(s) -
Galadzhun Yaroslav V.,
Horiacha Myroslava M.,
Nychyporuk Galyna P.,
Rodewald Ute Ch.,
Pöttgen Rainer,
Zaremba Vasyl I.
Publication year - 2016
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201600228
Subject(s) - gallium , indium , crystallography , nickel , materials science , diffractometer , gadolinium , crystal structure , octahedron , single crystal , zigzag , chemistry , metallurgy , geometry , mathematics
Polycrystalline samples of the isotypic quaternary compounds RE Ni 2 Ga 3 In ( RE = 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 “GdNiGa 3 In”. All samples were characterized by powder X‐ray diffraction. The structure of GdNi 2 Ga 2.89 In 1.11 was refined from single‐crystal X‐ray diffractometer data: new type, Pnma , a = 2426.38(7), b = 418.17(2), c = 927.27(3) pm, wR 2 = 0.0430, 1610 F 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 [Ni 2 Ga 3 In] 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 GdNi 2 Ga 3 In and La 4 Pd 10 In 21 structures are discussed.