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Updated: May 31, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Lattice vibrations in an α- and β-AgCuS superionic conductor: experimental time-of-flight inelastic neutron
A N Skomorokhov1, D M Trots, S G Ovchinnikov
1State Scientific Center-Institute for Physics and Power Engineering, Bondarenko Square 1, Obninsk 249033, Russia. Insitute for Material Science, Darmstadt University of Technology, Petersenstrasse 23, Darmstadt D-64287, Germany.
Abstract:
Inelastic neutron scattering (INS) measurements of a powder specimen of cation conducting AgCuS have been performed in its β-phase at 298 and 348 K and in its α-phase at 398 K by neutron time-of-flight (TOF) scattering. The neutron-weighted phonon density of states, G(ε), of the superionic and non-superionic phases of AgCuS has been obtained. G(ε) reveals a non-Debye behaviour at low energy that is caused by the presence of low-energy modes at 2.6 meV observed in the dynamic structure factor. The origin of this mode is not clear. The [Formula: see text] phase transition at 366 K is accompanied by considerable softening of several modes and simultaneous broadening of all peaks that result in a large increase of quasi-elastic intensity. Thermodynamic variables have been derived on the basis of G(ε).
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