New ternary phases from the R–Au–Ga systems (R = Gd-Tm)

Chem. Met. Alloys 7 (2014) 42-55

https://doi.org/10.30970/cma7.0268

Yuriy VERBOVYTSKYY

Twenty rare-earth gold gallides, RAu₃Ga₇ (ScRh₃Si₇-type, space group R-3c, Z = 6, hR66), RAu_3±xGa_3±x (YCd₆-type, space group Im-3, Z = 24, cI68), RAu_1+xGa_2-x (MgCuAl₂-type, space group Cmcm, Z = 4, oS16) (R = Gd-Tm) and R₁₄Au_34+xGa_17-x (Gd₁₄Ag₅₁-type, space group P6/m, Z = 1, hP65) (R = Er, Tm), were synthesized by arc-melting, followed by annealing at 400-600ºC. Six phases RAu_1+xGa_3-x (BaAl₄-type, space group I4/mmm, Z = 2, tI10) (R = Gd) and R₃Au_3+xGa_8-x (La₃Al₁₁-type, space group Immm, Z = 2, oI26) (R = Tb-Tm) were prepared by the flux method. Their crystal structures were studied by X-ray powder or single crystal diffraction. Structural peculiarities, coordination and interaction of the atoms in the investigated compounds are briefly discussed.

The RAu_3+xGa_3-x structure.

Keywords

Rare-earth intermetallics / Ternary gallides / Crystal growth / Single crystal / X-ray diffraction / Crystal structure