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The paper reports the results of a neutron scattering study of $$ {\hbox{C}}{{\hbox{u}}_{{2 - \delta }}}{\hbox{Se}} $$ superionic compounds. The crystallographic model fitted to the diffraction data shows the occupation of 8c and 32f sites by Cu atoms. Observed diffuse background is related to correlated thermal vibrations of Se and Cu atoms, with Se↔Cu (8c,32f) and Cu (8c)↔Cu (8c) correlations...
The lattice dynamics of Fe-18Cr-10Mn-16Ni austenitic steel was studied by inelastic neutron scattering techniques. Phonon dispersion curves were measured in the [100], [011] and [111] directions at low wavevectors. The measured dispersion curves are similar to those of the γ-Fe and the Fe0.75Ni0.25 alloy, but do not show the anomalous concave curvature of the T1 [001] branch at lower wave vectors...
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