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  An Electrochemical Approach toward the Metastable Type II Clathrate Germanium Allotrope

Böhme, B. (2020). An Electrochemical Approach toward the Metastable Type II Clathrate Germanium Allotrope. Inorganic Chemistry, 11920-11924. doi:10.1021/acs.inorgchem.0c01796.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-0F1C-B Version Permalink: http://hdl.handle.net/21.11116/0000-0007-0F23-2
Genre: Journal Article
Alternative Title : Inorganic Chemistry

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 Creators:
Böhme, Bodo1, Author              
Affiliations:
1Bodo Böhme, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863408              

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 Abstract: By using an anodic conversion process at 280 °C, the type II clathrates Na1.7(6)Ge136 and Na23.0(5)Ge136 were obtained from Na12Ge17 as the starting material. An alkali-metal iodide molten-salt electrolyte complied with the reaction conditions, allowing for the formation of microcrystalline products. Characterization by powder X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy also revealed Na4Ge13 as an intermediate and α-Ge and Cs8-xGe136 as byproducts, with the latter likely resulting from cation exchange between the starting material and electrolyte. Taking such minor side reactions and a small contribution of material without suitable electrical contact into account, anodic conversion of Na12Ge17 to Na1.7Ge136 proved to proceed without parasitic processes and to comprise the material bulk. The hitherto existing preparation method for Nax→0Ge136 by gas-solid oxidation of Na12Ge17 has thus been translated into a scalable high-temperature electrochemical approach with enhanced tools for reaction control, promising access to pure Ge(cF136) and Na24Ge136 after process optimization. © 2020 American Chemical Society.

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Language(s): eng - English
 Dates: 2020-08-242020-08-24
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1021/acs.inorgchem.0c01796
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Title: Inorganic Chemistry
  Abbreviation : Inorg. Chem.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 11920 - 11924 Identifier: ISSN: 0020-1669
CoNE: https://pure.mpg.de/cone/journals/resource/0020-1669