Results of the surface phonon velocity V R measurements in three ferroelastic crystals {Gd 2 (MoO 4 ) 3 , LiCsSO 4 and Rb 4 LiH 3 (SO 4 ) 4 } over the temperature range covering their transitions are presented. No significant elastic softening was observed in the course of our studies. In a few cases an anomalous increase of V R at T C was observed. The observed behavior may be attributed to the properties of the surface layer, which in the case Brillouin scattering experiment, is penetrated to about 300 nm from the surface.
Ferroelectrics
Volume 267, 2002 - Issue 1
![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})