Abstract
The search for new and better thermoelectric materials has recently brought to light a somewhat forgotten class of compounds, the clathrates of group 14. This and some purely theoretical interest in these and similar structural types have instigated much research on their electronic, magnetic, spectral, and conducting properties. Furthermore, renewed interest in these systems was sparked by the recent discovery of superconductivity in a Na-Ba-Si compound with the clathrate-I structure. Last, the clathrates are a step closer to porous silicon and the valuable optical properties that come with it. All of this interest has led to the search for reliable and reproducible ways for the synthesis of such silicon and germanium clathrates in high yields and with defined stoichiometry.
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