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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) November 2, 2016

Type-I silicon clathrates containing lithium

Bodo Böhme, Matej Bobnar, Alim Ormeci, Sarah Peters, Walter Schnelle, Michael Baitinger and Yuri Grin

Abstract

The intermetallic phase [LixBa8−x][LiySi46−y] is the first example of a clathrate-I silicide containing lithium with the peculiarity that the Li atoms occupy both cage and framework positions. The phase was obtained by ambient-pressure solid-state reactions at 400°C between Ba4Li2Si6 and the binary clathrate phase Ba8−xSi46 applying different experimental approaches. In this reaction, Li atoms substitute Si atoms of the framework at site 6c (space group Pmn) and fill up the Ba-deficient dodecahedral Si20 cages at site 2a. The presence of Li atoms in the clathrate phase was proven by combined X-ray powder diffraction, 7Li and 29Si solid-state NMR analyses. Incorporation of lithium markedly increased the lattice parameter of the clathrate phase, e.g. from a=10.3200(2) Å for Ba7.48(2)Si46 to a=10.3715(3) Å for [Li0.59(2)Ba7.41(2)][Li2.3(1)Si43.7(1)]. The critical temperature Tc for the transition to the superconducting state decreased from 7.7 K to 3.2 K upon Li incorporation.

Acknowledgments

We gratefully thank the Deutsche Forschungsgemeinschaft for generous support of our work within the priority program SPP1415. The articles [4, 10, 12–14, 21, 22, 28] have been published in peer-reviewed journals reporting on results of the project “In-situ Untersuchungen der Bildungsmechanismen von metastabilen Allotropen und Verbindungen der E13 und E14 Elemente durch Oxidation intermetallischer Phasen”. Concerning this article, we also thank Dr. A. Wosylus and Dr. U. Schwarz for preparation of Ba8−xSi46 by the high-pressure method and Dr. R. Cardoso, S. Hückmann, Dr. Y. Prots and Dr. H. Borrmann for recording X-ray diffraction patterns.

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Received: 2016-6-23
Accepted: 2016-10-1
Published Online: 2016-11-2
Published in Print: 2017-2-1

©2017 Walter de Gruyter GmbH, Berlin/Boston

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