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Triangular Ge 3 Units in a New Modification of EuGe 3
Author(s) -
Castillo Rodrigo,
Baranov Alexey I.,
Burkhardt Ulrich,
Grin Yuri,
Schwarz Ulrich
Publication year - 2015
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201400585
Subject(s) - europium , antiferromagnetism , covalent bond , crystallography , germanium , materials science , electrical resistivity and conductivity , crystal structure , chemical bond , magnetic susceptibility , chemistry , luminescence , condensed matter physics , silicon , physics , metallurgy , quantum mechanics , optoelectronics , organic chemistry
The hexagonal modification h P8 of the binary compound EuGe 3 was obtained by high‐pressure high‐temperature reaction at 12(1) GPa and 1100(110) K. The compound adopts an Mg 3 Cd‐type crystal structure, forming infinite columnar units of germanium triangles in staggered conformation which are stacked along the [001] direction. X‐ray absorption spectroscopy together with magnetic susceptibility measurements indicate the electron configuration 4 f 7 (2+) of the europium atoms. Chemical bonding analysis reveals covalent bonding within the triangular Ge 3 units and between Eu and Ge. Physical properties measurements indicate bad‐metal type electrical conductivity and an antiferromagnetic ordering of the europium moments below 36(1) K. At 8 GPa and 1000 K, EuGe 3 forms the modification h R36.