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Abstract:
Metastable Ge(cF136) with empty clathrate-II crystal structure was
successfully used for the preparation of otherwise hardly accessible
germanium clathrate phases. On reaction of Ge(cF136) with potassium
vapour at 280 degrees C for 6 days, the new clathrate-II phase K24Ge136
was formed, in which the cages of the germanium framework are completely
filled by potassium atoms. The crystal structure of KxGe136 is discussed
for different potassium contents (x = 0, 8.6, 24).
