Showing papers by "Leif Gerward published in 1988"
TL;DR: X-ray diffraction studies have been performed on UP powder for pressures up to 51 GPa using synchrotron radiation and a diamond-anvil cell to find the cubic phase has been found to transform to a new phase, UP II, at about 10 GPa.
Abstract: X-ray diffraction studies have been performed on UP powder for pressures up to 51 GPa using synchrotron radiation and a diamond-anvil cell. At ambient pressure UP has the rocksalt structure. The bulk modulus has been determined to ${B}_{0}$=102(4) GPa and its pressure derivative to ${B}_{0}^{\mathcal{'}}$=4.0(8). The cubic phase has been found to transform to a new phase, UP II, at about 10 GPa. UP II can be characterized by a rhombohedral Bravais lattice. UP II transforms to an orthorhombic phase, UP III, at 28 GPa. No volume change has been observed at the two transitions. The influence of the 5f electrons on the transformations is discussed.
14 citations