Single crystal investigation of the EuAg_xGa_3-x (x = 0.13) and Eu₄Ag_11+xGa_6-x (x = 0.27) phases

Chem. Met. Alloys 6 (2013) 28-39

https://doi.org/10.30970/cma6.0235

Yuriy VERBOVYTSKYY, António PEREIRA GONÇALVES

Two new ternary gallides, EuAg_xGa_3-x (x = 0.13) and Eu₄Ag_11+xGa_6-x (x = 0.27), have been prepared by arc-melting mixtures of the elements. Their crystal structures were determined by direct methods from single crystal X-ray diffraction data. The refined structural parameters are: space group Cmcm, Pearson symbol oS16, Z = 4, lattice parameters a = 4.3154(10) Å, b = 18.411(8) Å, c = 4.3781(10) Å, V = 347.84(19) Å³, reliability factors R1 = 0.0540; wR = 0.0999, χ = 1.024 for EuAg_xGa_3-x, and space group Pnma, Pearson symbol oP168, Z = 8, lattice parameters a = 9.784(3) Å, b = 9.3026(16) Å, c = 37.246(18) Å, V = 3390.0(19) Å³, reliability factors R1 = 0.0560; wR = 0.0878, χ = 1.000 for Eu₄Ag_11+xGa_6-x.

Projection of the structure of EuAg_xGa_3-x onto the YZ plane. The AlB₂- and BaAl₄-like fragments and the three-dimensional [M₃] network are indicated

Keywords

Intermetallics / Crystal structure / X-ray diffraction