Studies of U(C(5)H(5))(3)Cl : Evidence for structural phase transitions below room temperature
This article presents the use of neutron and X-ray diffraction techniques on both single crystal and polycrystalline samples to examine the symmetry of the unit cell of the organometallic compound uranium tris(cyclopentadienyl)chlorine, U(C(5)H(5))(3)Cl, as a function of temperature below 300 K. Two phase transitions are shown to occur. The first, at 245 K, results in a change of space group but the monoclinic symmetry is retained. The second, at 78 K, results in the material becoming triclinic Important differences are observed between the results obtained with neutron and X-ray diffraction. The latter fail to show clear evidence for the transition at 78 K. This is a consequence of the different penetration depths of the two radiations. Calorimetric data confirm the presence of the 245 K transition.
Bibliographic Reference: Article: Molecular Physics
Record Number: 199510047 / Last updated on: 1995-01-10
Original language: en
Available languages: en