Long-range modulation in a five-dimensional crystallographic superspace - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2015

Long-range modulation in a five-dimensional crystallographic superspace

Résumé

The intergrowth crystal of -tetracosane/urea presents a misfit parameter, defined by the ratio = / (/), that is very close to a commensurate value ( ≅ 1/3). High-resolution diffraction studies presented here reveal an aperiodic misfit parameter of = 0.3369, which is found to be constant at all temperatures studied. A complex sequence of structural phases is reported. The high temperature phase (phase I) exists in the four-dimensional superspace group 622(00). At = 179(1) K, a ferroelastic phase transition increases the dimension of the crystallographic superspace. This orthorhombic phase (phase II) is characterized by the five-dimensional (5D) superspace group 222(00)(10) with a modulation vector + = + · , in which the supplementary misfit parameter is = 0.025(1) in host reciprocal units. This corresponds to the appearance of a modulation of very long period (about 440 ± 16 Å). At = 163.0(5) K, a 5D to 5D phase transition leads to the crystallographic superspace group 222(00)(00) with a very similar value of . This phase transition reveals a significant hysteresis effect.
Fichier principal
Vignette du fichier
Long-range modulation of a composite crystal - published version.pdf (2.09 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01164047 , version 1 (16-06-2015)
hal-01164047 , version 2 (26-06-2015)

Identifiants

Citer

Laurent Guérin, Céline Mariette, Philippe Rabiller, Michael Huard, Sylvain Ravy, et al.. Long-range modulation in a five-dimensional crystallographic superspace. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 91 (18), pp.184101. ⟨10.1103/PhysRevB.91.184101⟩. ⟨hal-01164047v2⟩
663 Consultations
165 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More