Add time:08/12/2019         Source:sciencedirect.com

The novel binary europium silicide Eu3Si4 was synthesized from the elements. Its crystal structure is a derivative of the Ta3B4 type: space group Immm, a=4.6164(4) Å, b=3.9583(3) Å, c=18.229(1) Å, Z=2. In the structure, the silicon atoms form one-dimensional bands of condensed hexagons. Deviating from the prototype structure, a partial corrugation of the initially planar bands may be concluded from the analysis of the experimental electron density in the vicinity of the Si1 atoms. In the paramagnetic region, Eu3Si4 shows a 4f7 electronic configuration for the europium atoms. Two consecutive magnetic ordering transitions were found at 117 and 40 K. The first one is attributed to a ferromagnetic ordering of the Eu2 atoms; the second one is caused by a ferromagnetic ordering of the Eu1 atoms resulting in a ferrimagnetic ground state with a net magnetization of 7 μB at 1.8 K. The temperature dependence of the electrical resistivity reflects the metallic character of the investigated compound. Furthermore, the pronounced changes of the dρ/dT slope confirm the magnetic transitions. From bonding analysis with the electron localization function, Eu3Si4 shows a Zintl-like character and its electronic count balance can be written as (Eu1.83+)3(Si10.95−)2(Si21.8−)2, in good agreement with its magnetic behavior in the paramagnetic region.

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