Structure peculiarities of the new ternary gallide Tm₁₄Cu₄₆Ga₅

Chem. Met. Alloys 4 (2011) 119-125

https://doi.org/10.30970/cma4.0192

Oleg MYKHALICHKO, Yaroslav TOKAYCHUK, Roman GLADYSHEVSKII

The crystal structure of the new ternary compound Tm₁₄Cu₄₆Ga₅ (hP74-9, P6/m, a = 11.573(3), c = 8.559(2) Å) has been refined based on X-ray single-crystal diffraction data. It displays similarities with the binary structure types Ce₁₄Cu₅₁ and Gd₁₄Ag₅₁. In one of the monoatomic layers perpendicular to [0 0 1], a disordered atom arrangement, modeled by a half-occupied 6-fold site of Cu atoms and splitting of the Tm site into two half-occupied 6-fold positions, was observed. The structure is characterized by single Cu atoms, [Cu₃] triangles, and [Cu₃] finite chains; the Ga atoms are arranged in isolated [(Ga,Cu)₆] hexagons.

Cu-atom segments in the structure of Tm₁₄Cu₄₆Ga₅.

Keywords

Gallide / Thulium / Copper / Single-crystal X-ray diffraction / Crystal structure / Element substructure