Elastic neutron diffraction of Li2S, measured as a function of temperature, shows the onset of a diffuse phase transition near 900K to a highly conducting slate. Inelastic neutron scattering hasbeenusedtoinvestigatethe harmoniclatticedynamicsofLi,Sat 15 K. A shellmodel has been successfully fitted to the data. The dynamicalpropertiesarecommted within the harmonic approximation and compared with experimental data
Quenched equilibrium states of Cu–31.1 at.% Zn and Cu–22.4 at.% Zn single crystals (prepared with the Cu-65 isotope) were investigated by elastic diffuse neutron scattering. The diffuse intensity showed maxima which are attributed to the flat portions of the Fermi surface in the <110> directions. Short–range order parameters and linear displacement parameters were obtained from a fit to the measured data. Pair interaction energies were determined based on the inverse Monte–Carlo method. An ordered low-temperature phase Cu3Zn with the DO23 structure is suggested.
The dynamical properties of hydrogen in the sodalite Na8[AlSiO4]6 (OH)2 were investigated by quasielastic and inelastic neutron scattering techniques. The data were analyzed with a jump model for the hydrogen motion (OH reorientation). The characteristic time of the jump process is 2.1 ps at 295 K, the frequency of the local vibration (jump attempt frequency) is 17.4 THz. The detailed analysis shows that the hydrogen environment in the (Na4OH)3+ complex cation has lower than tetrahedral symmetry.
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