High-pressure crystal structure of thorium disulfide and diselenide and uranium disulfide |
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| Authors: | L. Gerward J. Staun Olsen U. Benedict H. C. Abraham F. Hulliger |
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| Affiliation: | 1. Physics Department , Technical University of Denmark , Building 307, DK-2800, Lyngby, Denmark;2. Niels Bohr Institute, Oersted Laboratory , DK-2100, Copenhagen, Denmark;3. EC-JRC, Institute for Transuranium Elements , Postfach 2340, 0-76125, Karlsruhe, FRG;4. Laboratorium für Festk?rperphysik , ETH-H?nggerberg, CH-8093, Zurich, Switzerland |
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| Abstract: | Abstract The crystal structure of ThS2, ThSe2 and US2 has been investigated for pressure up to 60GPa using x-ray powder diffraction. The bulk moduli are 175(10), 155(10) and 155(20) GPa, respectively. A pressure-induced phase transformation occurs at about 40 GPa for ThS2, 30 GPa for ThSe2 and 15 GPa for US2. The results for ThSe2 indicate that its high-pressure phase has a monoclinic structure. The same structure is compatible with the observed high-pressure spectra of ThS2 and US2. However, the crystal system assignment is less certain for these compounds. |
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| Keywords: | Bulk modulus phase transformation high-pressure actinide compounds x-ray diffraction synchrotron radiation |
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