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A new silicon-rich binary compound BaSi6 has been prepared by the treatment of the Ba8Si46 clathrate compound under a pressure of 15 GPa at 1000 °C, or from a stoichiometric mixture of BaSi2 and Si by treatment under similar high-pressure and high-temperature conditions. The Rietveld refinements revealed that BaSi6 is isomorphous with EuGa2Ge4, and crystallizes with space group Cmcm and the lattice parameters a = 4.485(1), b = 10.375(2), and c = 11.969(3) Å . Each Ba atom is surrounded by 18 Sidoi:10.1515/znb-2006-1205 fatcat:6ioxfgn3j5dcxigsoq76p5drke