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  Type-II Clathrate Na24-δGe136 from a Redox-Preparation Route

Feng, X.-J., Bobnar, M., Lerch, S., Biller, H., Schmidt, M., Baitinger, M., et al. (2021). Type-II Clathrate Na24-δGe136 from a Redox-Preparation Route. Chemistry – A European Journal, 27, 1-13. doi:10.1002/chem.202102082.

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 Creators:
Feng, Xian-Juan1, Author              
Bobnar, Matej1, Author              
Lerch, Swantje2, Author
Biller, Harry2, Author
Schmidt, Marcus3, Author              
Baitinger, Michael4, Author              
Strassner, Thomas2, Author
Grin, Yuri5, Author              
Böhme, Bodo6, Author              
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2External Organizations, ou_persistent22              
3Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
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              
6Bodo Böhme, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863408              

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 Abstract: The metastable type-II clathrate Na24-delta Ge136 was obtained from Na12Ge17 by applying a two-step procedure. At first, Na12Ge17 was reacted at 70 degrees C with a solution of benzophenone in the ionic liquid (IL) 1,3-dibutyl-2-methylimidazolium-bis(trifluoromethylsulfonyl) azanide. The IL was inert towards Na12Ge17, but capable of dissolving the sodium salts formed in the redox reaction. By annealing at 340 degrees C under an argon atmosphere, the X-ray amorphous intermediate product was transformed to crystalline Na24-delta Ge136 (delta approximate to 2) and alpha-Ge in an about 1 : 1 mass ratio. The product was characterized by X-ray powder diffraction, chemical analysis, and Na-23 solid-state NMR spectroscopy. Metallic properties of Na24-delta Ge136 were revealed by a significant Knight shift of the Na-23 NMR signals and by a Pauli-paramagnetic contribution to the magnetic susceptibility. At room temperature, Na24-delta Ge136 slowly ages, with a tendency to volume decrease and sodium loss.

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Language(s): eng - English
 Dates: 2021-07-162021-07-16
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/chem.202102082
 Degree: -

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Title: Chemistry – A European Journal
  Other : Chem. – Eur. J.
  Other : Chem. Eur. J.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 27 Sequence Number: - Start / End Page: 1 - 13 Identifier: ISSN: 0947-6539
CoNE: https://pure.mpg.de/cone/journals/resource/954926979058