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...

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Bibliographic Details
Published in:Journal of the less-common metals 1984-01, Vol.98 (2), p.291-300
Main Authors: Staun Olsen, J., Steenstrup, S., Gerward, L., Benedict, U., Spirlet, J.C., Andreetti, G.D.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Exact sciences and technology
Physics
Structure of solids and liquids
crystallography
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Summary: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.
ISSN:0022-5088
DOI:10.1016/0022-5088(84)90302-3