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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Huppertz, Hubert / Petrícek, Václav / Tiekink, E. R. T.

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2196-7105
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Type-I silicon clathrates containing lithium

Bodo Böhme
  • Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
  • :
/ Matej Bobnar
  • Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
/ Alim Ormeci
  • Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
/ Sarah Peters
  • Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
/ Walter Schnelle
  • Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
/ Michael Baitinger
  • Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
/ Yuri Grin
  • Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
Published Online: 2016-11-02 | DOI: https://doi.org/10.1515/zkri-2016-1983

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.

Keywords: Ba8−xSi46; clathrate; Li-Clathrate; metastable; SPP1415


Received: 2016-06-23

Accepted: 2016-10-01

Published Online: 2016-11-02

Published in Print: 2017-02-01


Citation Information: Zeitschrift für Kristallographie - Crystalline Materials. Volume 232, Issue 1-3, Pages 223–233, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1515/zkri-2016-1983, November 2016

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