Mise en évidence d'un ordre a courte distance dans la phase II des cristaux de NH4Cl, rappelant la phase III des cristaux de NH4Br
- 1 January 1974
- journal article
- Published by EDP Sciences in Journal de Physique
- Vol. 35 (10), 753-757
- https://doi.org/10.1051/jphys:019740035010075300
Abstract
Par diffusion de rayons X et par diffusion Raman, on montre l'importance des phonons aux points Γ et M de la zone de Brillouin dans la phase II désordonnée de NH4Cl. Les résultats sont interprétés en termes de domaines de fluctuation et d'ordre à courte distance correspondant aux arrangements parallèles et antiparallèles des 2 phases ordonnées déjà connues pour les halogénures d'ammoniumKeywords
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