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Frustrated pretransitional phenomena in aperiodic composites

Abstract : This paper reports on symmetry breaking in the aperiodic inclusion compound n-octadecane/urea and itsisotopomer n-octadecane/urea-d4.The high-symmetry phase is described by a hexagonal rank-4 superspace group.Pretransitional phenomena in this crystallographic superspace reveal competing short-range-ordering phenomenawithin the high-symmetry phase. Very high-resolution diffraction data show that critical scattering appears atinequivalent points within the four-dimensional Brillouin zone, although the first phase transition at Tc1 near158 K implies the condensation at only one of those points. The resulting superspace group remains of dimension4. Two other phase transitions are reported at Tc2 = 152.8(4) K and Tc3 = 109(4) K in n-octadecane/urea-d4.The two low-symmetry phases that arise are described by rank-5 superspace groups.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01400691
Contributor : Céline Mariette <>
Submitted on : Tuesday, November 22, 2016 - 1:41:58 PM
Last modification on : Wednesday, February 17, 2021 - 3:32:11 PM

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C. Mariette, Ilya Frantsuzov, Bo Wang, Laurent Guérin, P. Rabiller, et al.. Frustrated pretransitional phenomena in aperiodic composites. Physical Review B, American Physical Society, 2016, 94 (18), ⟨10.1103/PhysRevB.94.184105⟩. ⟨hal-01400691⟩

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