HIGH PRESSURE X-RAY DIFFRACTION EXPERIMENTS ON US USING SYNCHROTRON RADIATION
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 = 2a-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.
Bibliographic Reference: JOURNAL OF THE LESS-COMMON METALS, VOL. 98 (1984), PP. 291-300
Record Number: 1989122106000 / Last updated on: 1987-01-01
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