The first aluminide with Ho₄Ni₁₀Ga₂₁-type structure

Chem. Met. Alloys 6 (2013) 63-69

https://doi.org/10.30970/cma6.0259

Svitlana PUKAS, Pavlo DEMCHENKO, Roman GLADYSHEVSKII

Tetralutetium decanickel henicosaaluminide, Lu₄Ni₁₀Al₂₁, was synthesized by arc melting and its crystal structure was studied by X-ray powder diffraction. It is isotypic to Ho₄Ni₁₀Ga₂₁: Pearson symbol mS70, space group C2/m, a = 20.7920(4), b = 4.0279(1), c = 15.4778(3) Å, β = 124.878(1)º. The structure of the Lu₄Ni₁₀Al₂₁ compound belongs to a family of two-layer structures, where the atoms of each layer are situated at the centers of straight prisms built of atoms of the neighboring layers. The Lu and Ni atoms center pentagonal and trigonal prisms, respectively, whereas the Al atoms center square and pentagonal prisms in the ratio 15:6 in this description.

Projection of the structure of Lu₄Ni₁₀Al₂₁ along [010] (nets of triangles, squares and pentagons at y = 0 and y = ½ are indicated)

Keywords

Aluminum / Lutetium / Nickel / X-ray powder diffraction / Crystal structure / Crystal-chemical formulae