HIGH PRESSURE STRUCTURAL STUDIES OF UC BY X-RAY DIFFRACTION AND SYNCHROTRON RADIATION
High-pressure X-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-o = 4.9606(5) ANGSTROEM at ambient pressure. The bulk modulus and its pressure gradient are B-o = 155(10) GPa and B'-o = 7.9(14)-% 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 indexed using a pseudo-bodycentred orthorhombic unit cell, which is a distortion of the body centred tetragonal unit cell of the fcc lattice. The lattice constants at 33.6 GPa are a = 3.043(10) ANGSTROEM, b = 3.518(16) ANGSTROEM and c = 4.730(7) ANGSTROEM. The experimental equation of state has been compared with the results of theoretical calculations.
Bibliographic Reference: ACTINIDES '85, AIX-EN-PROVENCE (FRANCE), SEPT. 2-6, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32436 ORA
Availability: Can be ordered online
Record Number: 1989124053600 / Last updated on: 1987-01-01
Available languages: en