Long-range modulation of a composite crystal in a five-dimensional superspace

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dc.contributor.author Guerin, L.
dc.contributor.author Mariette, C.
dc.contributor.author Rabiller, P.
dc.contributor.author Huard, M.
dc.contributor.author Ravy, S.
dc.contributor.author Fertey, P.
dc.contributor.author Nichols, S. M.
dc.contributor.author Wang, B.
dc.contributor.author Mannsfeld, S. C. B.
dc.contributor.author Weber, T.
dc.contributor.author Hollingsworth, Mark D.
dc.contributor.author Toudic, B.
dc.date.accessioned 2016-04-04T22:24:06Z
dc.date.available 2016-04-04T22:24:06Z
dc.identifier.uri http://hdl.handle.net/2097/32266
dc.description Citation: Guerin, L., Mariette, C., Rabiller, P., Huard, M., Ravy, S., Fertey, P., . . . Toudic, B. (2015). Long-range modulation of a composite crystal in a five-dimensional superspace. Physical Review B, 91(18), 7. doi:10.1103/PhysRevB.91.184101
dc.description The intergrowth crystal of n-tetracosane/urea presents a misfit parameter, defined by the ratio gamma = c(h)/c(g) (c(host)/c(guest)), that is very close to a commensurate value (gamma congruent to 1/3). High-resolution diffraction studies presented here reveal an aperiodic misfit parameter of gamma = 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 P6(1)22(00 gamma). At T-c1 = 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 C222(1)(00 gamma)(10 delta) with a modulation vector a(o)* + c(m)* = a(o)* + delta . c(h)*, in which the supplementary misfit parameter is delta = 0.025(1) in host reciprocal units. This corresponds to the appearance of a modulation of very long period (about 440 +/- 16 angstrom). At T-c2 = 163.0(5) K, a 5D to 5D phase transition leads to the crystallographic superspace group P2(1)2(1)2(1)(00 gamma)(00 delta) with a very similar value of delta. This phase transition reveals a significant hysteresis effect.
dc.relation.uri https://doi.org/10.1103/PhysRevB.91.184101
dc.rights Copyright 2015 American Physical Society
dc.rights.uri http://www.sherpa.ac.uk/romeo/issn/1098-0121/
dc.subject Urea Inclusion-Compounds
dc.subject X-Ray-Diffraction
dc.subject Phase-Transition
dc.subject N-Paraffins
dc.subject Compounds Oc(Nh2)2+Cnh2N+2
dc.subject Aperiodic Crystals
dc.title Long-range modulation of a composite crystal in a five-dimensional superspace
dc.type Article
dc.date.published 2015
dc.citation.doi 10.1103/PhysRevB.91.184101
dc.citation.issn 1098-0121
dc.citation.issue 18
dc.citation.jtitle Physical Review B
dc.citation.spage 7
dc.citation.volume 91
dc.contributor.authoreid mdholl

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