Far-infrared reflectivity and Raman study in the ferroelectric–ferroelastic crystal of tris(dimethylammonium) nonabromodiantimonate

✍ Scribed by Y. Marqueton; A. Miniewicz; R. Jakubas

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 848 KB
• Volume: 23
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/jrs.1250230606

✦ Synopsis

Abstract

A study of far‐infrared (5–400 cm^−1^) polarized reflectivity spectra and preliminary Raman measurements of the ferroelectric crystal of DMABA, [NH~2~(CH~3~)~2~]~3~Sb~2~Br~9~, were made in the temperature range 80–300 K. The paraelectric–ferroelectric phase transition occurring at T~c~ = 164 K in this crystal has an impact on low‐frequency phonons. Oscillator strengths, induced dipole moments and mode dampings were determined as a function of temperature. Low‐frequency dielectric parameters were estimated from infrared reflectivity spectra of DMABA.