Abstract
High pressure X-ray diffraction studies (up to 40 GPa) were performed on US using synchrotron radiation and a diamond anvil cell. The measured value of 92 GPa for the bulk modulus B 0 is in reasonable agreement with calculations. The high pressure behaviour indicates a phase transformation to US III at about 15 GPa. The transformation is a smooth deformation process, which starts with a tetragonal structure ( a tetr = a cub 2 1 2 ; c tetr = 2 a cub ) and continues with an orthorhombic structure ( a = 375(3) pm; b = 345(3) pm; c = 1069(24) pm) at 35 GPa; it is second order within experimental error and it should involve some contributions from uranium f electrons.
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