Abstract
High-pressure v-ray diffraction studies have been performed on UC powder for pressures up to 46 GPa using a diamond anvil cell and synchrotron radiation. The low-pressure phase is of NaCl type with the lattice constant a 0 = 4.9606(5) A ̊ at ambient pressure. The best values of the bulk modulus and its pressure gradient are B 0= 160(4) GPa and B' 0 = 3.6(5) respectively. A transformation to a new phase, UC II, has been found at about 27 GPa. The diffraction lines from the high-pressure phase can be indeved using a pseudo-body-centred orthorhombic unit cell, which is a distortion of the body-centred tetragonal unit cell of the f.c.c. lattice. The lattice constants at 33.6 GPa are a = 3.043(10) A ̊ , b = 3.518(6) A ̊ and c = 4.730(7) A ̊ . The evperimental evuation of state has been compared with the results of theoretical calculations.
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