Synthesis,Crystal, and Electronic Structure of the New Ternary Zintl Phase Eu2–xMg2–yGe3 (x = 0.1; y = 0.5) |
| |
Authors: | Adam Slabon Eduardo Cuervo‐Reyes Christof Kubata Michael Wörle Christian Mensing Prof. Dr. Reinhard Nesper |
| |
Affiliation: | 1. Laboratory of Inorganic Chemistry, ETH Zürich, Wolfgang‐Pauli‐Str. 10, 8093 Zürich, Switzerland;2. Lapp Engineering & Co.Hinterbergstr. 15, 6330 Cham, Switzerland |
| |
Abstract: | The new ternary phase Eu2–xMg2–yGe3 (x = 0.1, y = 0.5) was obtained by solid‐state synthesis and the structure determined by means of Single Crystal X‐ray Diffraction. The compound crystallizes with the orthorhombic space group Cmcm (no. 63) having structural features of the low‐temperature modification of LaSi. The crystal structure contains two different types of germanium anions: isolated Ge4– and $rm^{2}_{infty}$ [Ge2–x–y] chains. The cation substructure is partially disordered and is best represented assuming a split position. The chemical bonding is well represented by the Zintl‐Klemm concept. Resistivity measurements reveal that the compound is metallic. DFT band structure calculations were carried out on the ideal stoichiometric compound Eu2Mg2Ge3, showing that this model (x = 0; y = 0) would be also metallic as a consequence of the ecliptic stacking of anions. Susceptibility and specific heat measurements evidence the presence of weak, and probably frustrated, antiferromagnetic interactions between disordered europium atoms. |
| |
Keywords: | Zintl phases Magnetic properties Chemical bonding Europium Structure elucidation |
|
|