Abstract
Si-clathrate compounds, Sr 8Ga x Si 46− x ( x=11 and 12), were synthesized by two methods: Ar-arc melting and floating-zone melting. The Ar-arc melting of a mixture of SrSi 2, Ga, and Si resulted in multiphase samples including the Si-clathrate, Sr 8Ga 12Si 34. A single-phase Sr 8Ga 11Si 35 was synthesized by floating-zone melting. Powder X-ray-diffraction patterns and precession photographs indicate that Sr 8Ga 11Si 35 is a type-I clathrate with a lattice constant of a=10.4075(3) Å. Sr 8Ga 11Si 35 is a metal whose dominant carriers are electrons, and it does not show superconductivity down to 2 K.
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