Infrared studies of the phase transition in TEA(TCNQ)2

✍ Scribed by V. Železný; J. L. Musfeldt; D. B. Tanner

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 290 KB
• Volume: 6
• Category: Article
• ISSN: 1616-301X
• DOI: 10.1002/(sici)1099-0712(199609)6:5/6<353::aid-amo294>3.0.co;2-p

✦ Synopsis

Polarised infrared and optical spectra were measured at temperatures between 5 and 300 K to study the 210 K structural phase transition in the organic charge transfer salt TEA(TCNQ),. At high temperatures, characteristic spectral features of semiconducting 1 : 2 TCNQ salts are observed. At low temperatures, several changes are found. First, the electronic charge transfer sharpens and has enhanced oscillator strength in the low-temperature phase. Second, the vibrational lines split into clear doublets, whose appearance is associated with a sharp decrease in the phonon damping at low temperatures.