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Lattice Dynamics of the Force Constant Disordered Crystal Pd 0.90 Ru 0.10
Author(s) -
Maliszewski E.,
Sosnowski J.,
Bednarski S.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221540214
Subject(s) - phonon , inelastic neutron scattering , force constant , condensed matter physics , dispersion relation , neutron scattering , inelastic scattering , lattice constant , physics , single crystal , scattering , materials science , atomic physics , chemistry , nuclear magnetic resonance , quantum mechanics , diffraction , molecule
Phonon dispersion relations for Pd 0.90 Ru 0.10 single crystal at room temperature are measured along the directions [100], [110], and [111] by inelastic neutron scattering. The Born‐von Karman analysis, using the seven‐neighbour model, is carried out, and the force constants and elastic constants are calculated. The phonon frequency shifts, Δω( q ), and the self‐energy functions, ∑ j ( q , ω j ( q )), for all the branches are determined from the experimental phonon data for Pd 0.90 Ru 0.10 and Pd. The self‐energy shows a rich and coherent structure and reveals unique information relevant to a theoretical model of a phonon induced fast diffusion in certain metals. The same structure of the self‐energy is observed in the sample after annealing at 1420°C.