The binary intermetallic clathrates KSi ( = 0.4; 1.2), RbSi, RbSi and CsSi were prepared from ₄Si₄ ( = K, Rb, Cs) precursors by spark-plasma route (SPS) and structurally characterized by Rietveld refinement of PXRD data. The clathrate-II phase RbSi was synthesized for the first time. Partial crystallographic site occupancy of the alkali metals, particularly for the smaller Si dodecahedra, was found in all compounds. SPS preparation of NaSi 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 KSi and KSi 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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| http://dx.doi.org/10.3390/ma9070593 | DOI Listing |
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