Structural and electrochemical properties of the binary silicides Eu5Si3 and EuSi
Author:
Belan Bohdana1, Daszkiewicz Marek2, Dzevenko Mariya13, Rożdżyńska-Kiełbik Beata4, Pavlyuk Volodymyr14, Gladyshevskii Roman1
Affiliation:
1. Department of Inorganic Chemistry , Ivan Franko National University of Lviv , Kyryla i Mefodiya Street 6, 79005 Lviv , Ukraine 2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences , P. O. Box 1410, 50-950 Wrocław , Poland 3. Chemical Faculty , Ivan Franko National University of Lviv , Kyryla i Mefodiya Street 6, UA-79005 Lviv , Ukraine 4. Faculty of Science and Technology , Institute of Chemistry, Częstochowa Jan Długosz University , al. Armii Krajowej 13/15, 42-200 Częstochowa , Poland
Abstract
Abstract
The crystal structures of Eu5Si3 and EuSi were studied in detail by X-ray single-crystal diffraction. The single crystals were selected from arc-melted and annealed samples. X-ray diffraction was performed at room temperature on an Oxford Diffraction X’calibur Atlas four-circle diffractometer (MoKα radiation). Eu5Si3 adopts the tetragonal Cr5B3-type: space group I4/mcm (# 140), Pearson code tI32, Z = 4, a = 7.9339(6), c = 15.308(2) Å. The compounds with equiatomic composition EuSi crystallize in the structure type TlI: space group Cmcm (# 63), Pearson code oS8, Z = 4, a = 4.6955(6), b = 11.1528(13), c = 3.9845(4) Å. The silicides Eu5Si3 and Li2Si form during electrochemical lithiation (charge process) of EuSi. The electrochemical process 5EuSi + 4Li+ + 4e
− ↔ Eu5Si3 + 2Li2Si is reversible, and the discharge specific capacity at 1C rate reached 140 mAhg−1 and the Coulombic efficiency is 93%.
Publisher
Walter de Gruyter GmbH
Subject
General Chemistry
Reference32 articles.
1. Belan, B. D. Phase Equilibria, Crystal Structure and Properties of Compounds in the Systems Eu–{Fe, Co, Ni, Cu}–{Si, Ge}. Dissertation, University of Lvov, Lviv, 1988. 2. Evers, J., Oehlinger, G., Weiss, A., Hulliger, F. J. Less Common. Met. 1983, 90, L19–L23; https://doi.org/10.1016/0022-5088(83)90080-2. 3. Merlo, F., Palenzona, A., Pani, M. J. Alloys Compd. 2003, 348, 173–175; https://doi.org/10.1016/s0925-8388(02)00851-4. 4. Mishra, R., Hoffmann, R.-D., Pöttgen, R., Trill, H., Mosel, B. D. Z. Anorg. Allg. Chem. 2002, 628, 741–744; https://doi.org/10.1002/1521-3749(200205)628:4<741::aid-zaac741>3.0.co;2-1. 5. Weitzer, F., Prots, Y. M., Schnelle, W., Hiebl, K., Grin, Y. J. Solid State Chem. 2004, 177, 2115–2121; https://doi.org/10.1016/j.jssc.2004.02.013.
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