BRILLOUIN-SCATTERING STUDY OF THE SUPERIONIC PHASE-TRANSITION IN (NH4)(4)H-2(SEO4)(3)

Authors
PAVEL M PAWLOWSKI A ZIKMUND Z DROZDOWSKI M
Citation
M. Pavel et al., BRILLOUIN-SCATTERING STUDY OF THE SUPERIONIC PHASE-TRANSITION IN (NH4)(4)H-2(SEO4)(3), Solid state ionics, 91(1-2), 1996, pp. 161-164
Citations number
11
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical
Journal title
Solid state ionics → ACNP
ISSN journal
01672738
Volume
91
Issue
1-2
Year of publication
1996
Pages
161 - 164
Database
ISI
SICI code
0167-2738(1996)91:1-2<161:BSOTSP>2.0.ZU;2-0
Abstract
The acoustic behaviour of (NH4)(4)H-2(SeO4)(3) single crystal around t he superionic phase transition at 378 K was studied by Brillouin scatt ering measurements. No anomaly of the longitudinal mode in the [100] d irection was observed whereas 5% softening of the longitudinal mode wi th a minimum at 382 K was found in the [001] direction. The possible s ymmetry of the crystal above the superionic phase transition is discus sed.