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The high-pressure crystal structures of the compounds UX, where X = N, P, As and Sb are studied using X-ray diffraction in the pressure range up to about 60 GPa. Rhombohedral distortions are observed for UN and UP above 29 GPa and 10 GPa, respectively. In UP a further transformation to an orthorhombic phase occurs at 28 GPa. UAs and USb transform to the CsCl structure at 20 GPa and 9 GPa, respectively. The latter transformations show a considerable hysteresis when the pressure is released. The scaling behaviour of the bulk modulus is studied. It is confirmed that a log-log plot of bulk modulus versus specific volume for the cubic phases gives a straight line with a slope near -5/3.

Additional information

Authors: STAUN OLSEN J, University of Copenhagen, Copenhagen (DK);GERWARD L, Technical University of Lyngby (DK);BENEDICT U, JRC Karlsruhe (DE);DABOS S, JRC Karlsruhe (DE);ITIÉ J P, CNRS, Paris (FR);VOGT O, ETH Zürich (CH)
Bibliographic Reference: Article: High Pressure Research, Vol. 1 (1989) pp. 253-266
Record Number: 199010748 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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