Lattice Dynamics of Cesium Fluoride

✍ Scribed by Stig Rolandson

• Publisher: John Wiley and Sons
• Year: 1972
• Tongue: English
• Weight: 498 KB
• Volume: 52
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220520234

✦ Synopsis

Abstract

The phonon dispersion relations in cesium fluoride have been measured by inelastic neutron scattering in the symmetry directions Δ Σ, and A. The measurements were performed at 80 and 300 K using a three‐axis spectrometer. The experimental results are compared with theoretical calculations based on various models of the interionic interactions in alkali halides. A satisfactory fit was obtained by a seven‐parameter model with only the cesium ion polarizable, and the fit was only slightly improved by using more complicated models with a larger number of adjustable parameters. The frequency distribution has been calculated using an eleven‐parameter shell model with both ions polarizable, and compared with similar calculations based on data from macroscopic measurements.