Influence of structural fluctuations on the dynamical characteristics of solids

✍ Scribed by V.I. Yukalov

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 472 KB
• Volume: 229
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(94)01034-x

✦ Synopsis

Structural fluctuations occurring around structural phase transitions can strongly influence the dynamical characteristics of solids. Formulae are derived explicitly showing the role of these fluctuations on the following: softening of phonon frequencies, diminishing of the effective Debye temperature, increase of the mean-square displacement of atoms, sound-velocity attenuation near the point of a structural transition and the corresponding enhancement of the isothermic compressibility, anomalous sagging of the Mossbauer factor at the transition temperature and its linear deviation in the vicinity of a nucleation point.