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Lattice Dynamics of Potassium Fluoride
Author(s) -
Bührer W.
Publication year - 1970
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.19700410235
Subject(s) - debye model , inelastic neutron scattering , polarizability , dispersion relation , debye , phonon , ion , potassium , superposition principle , potassium fluoride , neutron scattering , fluoride , scattering , chemistry , condensed matter physics , physics , optics , inorganic chemistry , quantum mechanics , organic chemistry , molecule
By slow neutron inelastic scattering the phonon dispersion relation was measured in potassium fluoride at room temperature for waves propagating along symmetry directions [00ζ], [ζζ0], and [ζζζ]. The experiments were performed on the reactor Diorit at Würenlingen, using a triple axis spectrometer. The results were analyzed in terms of various interionic‐force models. A satisfactory fit is provided by an eleven‐parameter dipole approximation model, which allows for the polarizability of both ions. This model was then used to calculate a frequency distribution from which the specific heat and Debye temperature were evaluated for comparison with thermodynamic data.