Abstract
The low-temperature structure of UNi 2 Sn has been identified by means of neutron powder diffraction. It is an orthorhombic structure, space group Pnma , with lattice parameters a = 9.6208(8), b = 4.3055(4) and c = 6.5895(6) Å at 80 K, Z = 4. The orthorhombic deformation is caused by displacements of the atoms out of their positions in the high-temperature Heusler structure, which is cubic, space group Fm 3 m . The pattern of these displacements can be described by two wavevectors q = 2π 2a (1, 1, 0) and 2π a (1, −1, 0) , for polarization directions p = (0, 0, 1) and (1, 1, 0) respectively. the cubic coordinate system. In the low-temperature refinement R Bragg = 4.05% and θ 2 = 5.53 was obtained.
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