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  Binary Alkali-Metal Silicon Clathrates by Spark Plasma Sintering: Preparation and Characterization

Veremchuk, I., Beekman, M., Antonyshyn, I., Schnelle, W., Baitinger, M., Nolas, G. S., et al. (2016). Binary Alkali-Metal Silicon Clathrates by Spark Plasma Sintering: Preparation and Characterization. Materials, 9(7): 593, pp. 1-10. doi:10.3390/ma9070593.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-4DCC-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-2915-A
Genre: Journal Article

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 Creators:
Veremchuk, Igor1, Author              
Beekman, Matt2, Author
Antonyshyn, Iryna3, Author              
Schnelle, Walter4, Author              
Baitinger, Michael5, Author              
Nolas, George S.2, Author
Grin, Yuri6, Author              
Affiliations:
1Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863411              
2External Organizations, ou_persistent22              
3Iryna Antonyshyn, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863412              
4Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
5Michael Baitinger, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863416              
6Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              

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 Abstract: The binary intermetallic clathrates K8-xSi46 (x = 0.4; 1.2), Rb6.2Si46, Rb11.5Si136 and Cs7.8Si136 were prepared from M4Si4 (M = K, Rb, Cs) precursors by spark-plasma route (SPS) and structurally characterized by Rietveld refinement of PXRD data. The clathrate-II phase Rb11.5Si136 was synthesized for the first time. Partial crystallographic site occupancy of the alkali metals, particularly for the smaller Si-20 dodecahedra, was found in all compounds. SPS preparation of Na24Si136 with different SPS current polarities and tooling were performed in order to investigate the role of the electric field on clathrate formation. The electrical and thermal transport properties of K7.6Si46 and K6.8Si46 in the temperature range 4-700 K were investigated. Our findings demonstrate that SPS is a novel tool for the synthesis of intermetallic clathrate phases that are not easily accessible by conventional synthesis techniques.

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Language(s): eng - English
 Dates: 2016-07-192016-07-19
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000380761500095
DOI: 10.3390/ma9070593
 Degree: -

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Title: Materials
Source Genre: Journal
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Publ. Info: Basel : MDPI
Pages: - Volume / Issue: 9 (7) Sequence Number: 593 Start / End Page: 1 - 10 Identifier: Other: 1996-1944
CoNE: /journals/resource/1996-1944