Brillouin scattering study of the superionic phase transition in (NH4)4H2(SeO4)3

✍ Scribed by M. Pavel; A. Pawlowski; Z. Zikmund; M. Drozdowski

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 305 KB
• Volume: 91
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)00426-2

✦ Synopsis

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 found in the [OOl] direction. The possible symmetry of the crystal above the superionic phase transition is discussed.