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- W2003011764 abstract "The dynamics of a simple rigid pseudoglobular molecule (2-adamantanone) has been studied by means of dielectric spectroscopy and examined under the constraints imposed by the space group of the crystal structure determined by x-ray powder diffraction. The low-temperature monoclinic structure of 2-adamantanone, with one molecule per asymmetric unit (${Z}^{ensuremath{'}}=1$), displays a statistical intrinsic disorder, concerning the site occupancy of the oxygen atom along three different sites. Such a physically identifiable disorder gives rise to large-angle molecular rotations which inherently lead to time-average fluctuations of the molecular dipole, thus contributing to the dielectric susceptibility. The dielectric spectra for the low-temperature ``ordered'' phase displays a universal feature of glassy-like materials, i.e., coexistence of ensuremath{alpha}- and ensuremath{beta}-relaxation processes. The former is clearly identified with the strongly restricted reorientational motions within the long-range ``ordered'' crystalline lattice. The latter, never observed before in fully translationally and highly orientationally ordered phases, displays all the properties of an original Johari-Goldstein ensuremath{beta}-relaxation, in spite of the strong character of this glass-like phase. These findings can be explained according to the coupling model, applied to such ``ordered'' phases." @default.
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- W2003011764 date "2012-04-04" @default.
- W2003011764 modified "2023-10-11" @default.
- W2003011764 title "Emergence of glassy-like dynamics in an orientationally ordered phase" @default.
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- W2003011764 doi "https://doi.org/10.1103/physrevb.85.134201" @default.
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