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Instability and thermal conductivity of pressure-densified and elastically altered orientational glass of Buckminsterfullerene
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2018 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 148, no 14, article id 144502Article in journal (Refereed) Published
Abstract [en]

We report on the temperature, pressure and time (T, p and t)- dependent features of thermal conductivity, k, of partially ordered, non-equilibrium state of C60-OG, the orientational glass of Buckminsterfullerene (at T below the orientational freezing temperature Tog) made more unstable (i) by partially depressurizing its high-p formed state to elastically expand it, and (ii) by further pressurizing that state to elastically contract it. The sub-Tog effects observed on heating of C60-OG differ from those of glasses, because phonon propagation depends on the ratio of two well-defined orientational states of C60 molecules and the density of the solid. A broad peak-like feature appears at T near Tog in the k-T plots of C60-OG formed at 0.7 and heated at 0.2 GPa, which we attribute to partial overlap of the sub-Tog and Tog features. A sub-Tog local minimum appears in the k -T plots at T well below Tog  of C60-OG formed at 0.1 GPa and heated at 0.5 GPa, and corresponds to the state of maximum disorder. Although Buckminsterfullerene is regarded as an orientationally-disordered crystal, variation of its properties with T and p is qualitatively different from other such crystals. We discuss the findings in terms of the nature of its disorder, sensitivity of its rotational dynamics to temperature and the absence of the Johari-Goldstein relaxation. All seem to affect the phenomenology of its glass-like transition.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2018. Vol. 148, no 14, article id 144502
Keywords [en]
C60, pressure densified glasses, high-pressure
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-147236DOI: 10.1063/1.5019832ISI: 000430128600028PubMedID: 29655324OAI: oai:DiVA.org:umu-147236DiVA, id: diva2:1202591
Available from: 2018-04-27 Created: 2018-04-27 Last updated: 2018-06-09Bibliographically approved

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Andersson, OveSundqvist, Bertil

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