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Triangular Ge3 Units in a New Modification of EuGe3

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Castillo,  Rodrigo
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Baranov,  Alexey I.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Burkhardt,  Ulrich
Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grin,  Yuri
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schwarz,  Ulrich
Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Castillo, R., Baranov, A. I., Burkhardt, U., Grin, Y., & Schwarz, U. (2015). Triangular Ge3 Units in a New Modification of EuGe3. Zeitschrift für anorganische und allgemeine Chemie, 641(2), 355-361. doi:10.1002/zaac.201400585.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0026-BFF3-4
Abstract
The hexagonal modification hP8 of the binary compound EuGe3 was obtained by high-pressure high-temperature reaction at 12(1) GPa and 1100(110) K. The compound adopts an Mg3Cd-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 4f(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, EuGe3 forms the modification hR36.