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The Lattice Dynamics of Ni 0.88 Fe 0.12 , Ni 0.76 Fe 0.24 and Ni Single Crystals
Author(s) -
Maliszewski E.,
Bednarski S.
Publication year - 1997
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 - 10.1002/1521-3951(199704)200:2<435::aid-pssb435>3.0.co;2-y
Subject(s) - phonon , condensed matter physics , dispersion relation , inelastic neutron scattering , polarization (electrochemistry) , force constant , scattering , inelastic scattering , lattice (music) , lattice constant , materials science , dispersion (optics) , physics , chemistry , optics , quantum mechanics , diffraction , molecule , acoustics
The phonon dispersion relations for Ni and Ni rich Ni–Fe alloys are measured using inelastic neutron scattering along the [100], [110] and [111] directions at room temperature. The results are described in terms of the seven‐neighbour Born‐von Karman model, and the force constants and elastic constants are calculated. The phonon frequency shifts Δω( q ) and the self‐energy functions Σ j ( q , ω j ( q )) are determined for Ni 0.88 Fe 0.12 and Ni 0.76 Fe 0.24 from the experimental phonon data for the alloyed and Ni single crystals. The shapes of these functions display their peculiar dependence on phonon wave vectors and on phonon branches (polarization).