Lattice dynamics of lead: An elastic force model approach

✍ Scribed by H. C. Gupta; B. B. Tripathi

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 262 KB
• Volume: 45
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220450126

✦ Synopsis

Abstract

The lattice dynamics of lead is discussed within the framework of elastic force models which include volume forces in addition to the central and the angular ones. The volume forces have been taken on the lines of Sharma and Joshi, while both Clark, Gazis, and Wallis (CGW) type of angular forces and that of de Launey (DAF) type have been used. The results of the phonon dispersion curves and the Debye temperatures have been compared with the experimental ones. The agreement obtained with both the angular force models is satisfactory. In the phonon dispersion curves, Kohn anomalies are seen using the DAF type angular force model but not using the CGW type. It is shown that the CGW model gives better results than the DAF one.