The new monoclinic structure type Gd₄ReGe₈

Chem. Met. Alloys 8 (2015) 55-62

https://doi.org/10.30970/cma8.0312

Vitaliia MYKHALICHKO, Roksolana KOZAK, Roman GLADYSHEVSKII

A new monoclinic structure type of intermetallic compounds, Gd₄ReGe₈ (mP64-12, P2₁/с, a = 5.8106(7), b = 16.060(2), c = 12.852(2) Å, β = 115.379(9)°, R = 0.0405, R_w = 0.0866), was identified on the basis of X-ray single-crystal diffraction data. The structure of Gd₄ReGe₈ is a monoclinic derivative of the CeNiSi₂ type, formed as a result of partial ordering of d-element vacancies. The structure, which contains four partly occupied Re sites, is closely related to the Tb₄FeGe₈ type, where only two partly occupied Fe sites were refined.

Packing of Gd-centered polyhedra in the structure of Gd₄ReGe₈ (small red circles: Ge atoms, medium green circles: Re atoms, large yellow circles: Gd atoms).

Keywords

Gadolinium / Rhenium / Germanium / Bärnighausen formalism / X-ray diffraction