Single crystal investigation of the EuAgxGa3-x (x = 0.13) and Eu4Ag11+xGa6-x (x = 0.27) phases

 

Chem. Met. Alloys 6 (2013) 28-39

 

Yuriy VERBOVYTSKYY, António PEREIRA GONÇALVES

 

Two new ternary gallides, EuAgxGa3-x (x = 0.13) and Eu4Ag11+xGa6-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 EuAgxGa3-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 Eu4Ag11+xGa6-x.

 

 

Projection of the structure of EuAgxGa3-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