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A Tale of Two Polymorphs – Growth and Characterization of α‐LnNiGa 4 (Ln = Y, Gd–Yb) and β‐LnNi 1– x Ga 4 (Ln = Tb–Er)
Author(s) -
Menard Melissa C.,
Drake Brenton L.,
McCandless Gregory T.,
Thomas Kandace R.,
Hembree Richard D.,
Haldolaarachchige Neel,
DiTusa John F.,
Young David P.,
Chan Julia Y.
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100289
Subject(s) - isostructural , crystallography , chemistry , orthorhombic crystal system , tetragonal crystal system , magnetic susceptibility , antiferromagnetism , structure type , ion , crystal structure , condensed matter physics , physics , organic chemistry
The single crystals of two polymorphs of LnNiGa 4 , namely, the orthorhombic α‐LnNiGa 4 (Ln = Y, Gd–Yb) and, a new polymorph, the tetragonal β‐LnNi 1– x Ga 4 (Ln = Tb–Er), were successfully grown by using the self‐flux method. α‐LnNiGa 4 (Ln = Y, Gd–Yb) is isostructural to YNiAl 4 and can be described as an edge‐sharing polyhedral of Ni@Ga 7 Ln 2 (Ln = Y, Gd–Yb) along the ac ‐plane that is sandwiched between the square nets of the Ga atoms along the b ‐axis. The structure of β‐LnNi 1– x Ga 4 (Ln = Tb–Er) is a distorted variant of the Ce 2 NiGa 10 ‐structure type with a Ni deficiency and multiple Ga split positions and is structurally related to YNiGa 3 Ge. The magnetic data for β‐LnNi 1– x Ga 4 (Ln = Tb–Er) and the transport properties for α‐LnNiGa 4 (Ln = Y, Gd–Tm) and β‐LnNi 1– x Ga 4 (Ln = Tb–Er) are reported. Antiferromagnetic correlations are observed in the magnetic susceptibility of β‐LnNi 1– x Ga 4 (Ln = Tb–Er), where the magnetic transitions occurred below 7 K and with effective moments that are consistent with free Ln 3+ ions.