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 RI = 0.071, Rp = 0.152
and RDBWS = 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 μeff = 8.07 μB and antiferromagnetic ordering at ca.
25 K.
Al-Ge network in the EuAl2Ge
structure.
Keywords
EuAl2Ge / Synthesis / Crystal structure / Rare earth / Powder
diffraction