Silicon Olijnyk H, Sikka S K, Holzapfel W B Physics Letters 103A (1984) 137-140 Structural phase transitions in Si and Ge under pressures up to 50 GPa Locality: synthetic Sample: at P = 43 GPa Note: phase VII, structure stable above 43 GPa _database_code_amcsd 0015304 2.444 2.444 4.152 90 90 120 P6_3/mmc atom x y z Si 1/3 2/3 .25