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On europium digallides

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Sichevych,  Olga
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126811

Ramlau,  Reiner
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schmidt,  Marcus
Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schnelle,  Walter
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons126626

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

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Citation

Sichevych, O., Ramlau, R., Schmidt, M., Schnelle, W., & Grin, Y. (2023). On europium digallides. Zeitschrift für anorganische und allgemeine Chemie, 649(15): e202300101, pp. 1-7. doi:10.1002/zaac.202300101.


Cite as: https://hdl.handle.net/21.11116/0000-000D-4E2D-B
Abstract
The europium gallide Eu1-xGa2+3x (x is between 0.06 and 0.07) has been synthesized and its crystal structure has been refined from single crystal X-ray diffraction data. Eu1-xGa2+3x crystallizes with hexagonal structure related to the AlB2-type (space group P6/mmm, a=4.354 Å, c=4.485 Å). The structure refinement finished with R(F)=0.015 for 1603 reflections revealing a defect occupation of the Eu position (93 %) and additional Ga position, yielding the non-integer element ratio. From magnetic susceptibility measurements, EuGa2 and Eu1-xGa2+3x phases show the 4f 7 (Eu+2) oxidation state. The analysis of effective atomic charges within the Quantum Theory of Atoms in Molecules reveals the formation of four-bonded Ga species with low electron demand (in comparison to the three-bonded in AlB2-type and four-bonded in the KHg2-type structures) and shows, that Eu1-xGa2+3x represents a new way of stabilizing intermetallic structures formed at valence electron concentration, which does not allow to apply Zintl-like electron counting. © 2023 The Authors. Zeitschrift für anorganische und allgemeine Chemie published by Wiley-VCH GmbH.