Order–disorder and structural phase transitions in solid-state materials by Raman scattering analysis

✍ Scribed by C. Carabatos-Nédelec; P. Becker

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 766 KB
• Volume: 28
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/(sici)1097-4555(199709)28:9<663::aid-jrs157>3.0.co;2-l

✦ Synopsis

The temperature dependence of the vibrational wavenumbers, of the anharmonic and/or order-disorder origin of the damping and of the Raman intensities are brieÑy presented. On that basis, it is then shown that one can obtain information such as the height of the potential barrier, the orientational correlation time, the spatial correlation length and the anharmonic contribution to the Raman peak evolution with temperature. The concepts were applied and exploited with success in three characteristic cases, diethylenetriammonium chlorocadmate [ (denH 3 )CdCl 5 ] single crystals, zinc thiourea sulphate [ ZTS ] single crystals and lead-lanthanum zirconate-titanate [ PLZT ] ceramics in which order-disorder and structural phase transitions are observed. 1997