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Samples with the type-I clathrate composition Ba 8 Ni x Si 46−x have been synthesized and their structure and thermoelectric properties characterized. Microprobe analysis indicates the Ni incorporation to be 2.62≤x≤3.53. The x=3.5 phase crystallizes in the type-I clathrate structure (space group: Pm-3n) with a lattice parameter of 10.2813(3)Å. The refined composition was Ba...