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