A study of phase transitions in (NH4)3H(SO4)2 crystals through Raman scattering
โ Scribed by Hossain, M. A. ;Srivastava, J. P. ;Sattar, A. ;Khulbe, P. K. ;Bist, H. D.
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 536 KB
- Volume
- 141
- Category
- Article
- ISSN
- 0031-8965
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The acoustic behaviour of (NH,),H,(SeO,), single crystal around the superionic phase transition at 378 K was studied by Brillouin scattering measurements. No anomaly of the longitudinal mode in the [loo] direction was observed whereas 5% softening of the longitudinal mode with a minimum at 382 K was
Infrared and polarized Raman spectra of (NH4)JH(S04)1 have been recorded and analysed. Multiple bands are observed for the vibrational modes of SO:-and NH: groups. HSO; and SO:-ions are found to coexist with vibrational interaction between them. NH: ion is not rotating freely in the lattice.