EuAl₂Ge, its synthesis and property characterizations

Chem. Met. Alloys 1 (2008) 348-351

https://doi.org/10.30970/cma1.0074

Jing-Tai ZHAO, Xin-Xin YANG, Hao-Hong CHEN, Walter SCHNELLE, Yuri GRIN

EuAl₂Ge, orthorhombic system, space group Pnma (No. 62), unit cell parameters: a = 7.294(2) Å, b = 4.306(1) Å, c = 11.237(4) Å, V = 352.9(3) Å³, Mr = 1114.04, Dx = 5.2425(1) g cm^-3, F(000) = 484, Z = 4, μ = 1262.5 cm^-1 (Cu Ka1, 1.54056 Å), ab initio structure model with full profile refinement from a powder pattern (211 reflections and 17300 profile points) for 14 free parameters resulted in R_I = 0.071, R_p = 0.152 and R_DBWS = 0.116 with goodness of fit = 0.580. The structure is related to the b-YbAgGa₂, ScRhSi₂ and YZn₃ types and can be considered as an intergrowth of BaAl₄- and distorted CaF₂-type columns. The magnetic susceptibility is characteristic of pure Eu²⁺ with μ_eff = 8.07 μ_B and antiferromagnetic ordering at ca. 25 K.

Al-Ge network in the EuAl₂Ge structure.

Keywords

EuAl₂Ge / Synthesis / Crystal structure / Rare earth / Powder diffraction