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  A guest-free germanium clathrate

Guloy, A. M., Ramlau, R., Tang, Z., Schnelle, W., Baitinger, M., & Grin, Y. (2006). A guest-free germanium clathrate. Nature, 443(7109), 320-323. doi:10.1038/nature05145.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-80A1-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-F90B-E
Genre: Journal Article

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 Creators:
Guloy, Arnold M.1, Author              
Ramlau, Reiner2, Author              
Tang, Zhongjia1, Author              
Schnelle, Walter3, Author              
Baitinger, Michael4, Author              
Grin, Yuri5, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Reiner Ramlau, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863436              
3Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
4Michael Baitinger, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863416              
5Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              

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 Abstract: The challenges associated with synthesizing expanded semiconductor frameworks with cage-like crystal structures continue to be of interest(1,2). Filled low-density germanium and silicon framework structures have distinct properties that address important issues in thermoelectric phonon glass - electron crystals(3), superconductivity(4) and the possibility of Kondo insulators(5). Interest in empty framework structures of silicon and germanium is motivated by their predicted wide optical bandgaps of the same magnitude as quantum dots and porous silicon, making them and their alloys promising materials for silicon-based optoelectronic devices(6,7). Although almost-empty Na1-xSi136 has already been reported(8,9), the synthesis of guest-free germanium clathrate has so far been unsuccessful. Here we report the high-yield synthesis and characteristics of germanium with the empty clathrate-II structure through the oxidation of Ge-9(4-) Zintl anions in ionic liquids under ambient conditions. The approach demonstrates the potential of ionic liquids as media for the reactions of polar intermetallic phases.

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 Dates: 2006-08-08
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: ISI: 000240622000042
DOI: 10.1038/nature05145
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Title: Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 443 (7109) Sequence Number: - Start / End Page: 320 - 323 Identifier: ISSN: 0028-0836
CoNE: /journals/resource/954925427238