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Licensed Unlicensed Requires Authentication Published by Oldenbourg Wissenschaftsverlag September 18, 2014

Preparation of anionic clathrate-II K24-xGe136 by filling of Ge(cF136)

Bodo Böhme, Marianne Reibold, Gudrun Auffermann, Hannes Lichte, Michael Baitinger and Yuri Grin


Metastable Ge(cF136) with empty clathrate-II crystal structure was successfully used for the preparation of otherwise hardly accessible germanium clathrate phases. On reaction of Ge(cF136) with potassium vapour at 280 °C for 6 days, the new clathrate-II phase K24Ge136 was formed, in which the cages of the germanium framework are completely filled by potassium atoms. The crystal structure of KxGe136 is discussed for different potassium contents (x=0, 8.6, 24).

Corresponding authors: Bodo Böhme and Yuri Grin, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany, E-mail: ,


We thank Ulrike Schmidt, Anja Völzke and Sebastian Schwinger for chemical analyses, and the Competence Groups Metallografie and Struktur at the MPI CPfS for SEM/EDXS and X-ray diffraction experiments, respectively. This work was financially supported by the Deutsche Forschungsgemeinschaft within the frame of the priority program (SPP 1415) “Kristalline Nichtgleichgewichtsphasen”.


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Received: 2014-5-2
Accepted: 2014-8-7
Published Online: 2014-9-18
Published in Print: 2014-10-1

©2014 by De Gruyter