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Thermal conductivity of C60 at pressures up to 1 GPa and temperatures in the range 50-300 K
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
1996 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 54, no 5, 3093-3100 p.Article in journal (Refereed) Published
Abstract [en]

The thermal conductivity λ of C60 shows anomalies near 260 K and 90 K which are associated with the well-established phase transition and glass transition, respectively. Both transition temperatures increase with pressure, at the rates 120 K GPa-1 and 62 K GPa-1, respectively. With increasing temperature, λ of the simple cubic (sc) phase increased below 170 K (glasslike behavior) but decreased above. The glasslike behavior of λ is probably due to a substantial amount of lattice defects. Possible reasons for the change of sign of dλ/dT near 170 K are discussed. In the face centered cubic (fcc) phase (T≳260 K at atmospheric pressure) λ was almost independent of temperature, a behavior which is far from that of an ordered crystal (λ∝T-1 for T≳Debye temperature). This result can be attributed to the molecular orientational disorder of the fcc phase. The relaxation behavior associated with the glassy state and its unusually strong dependence on thermal history are discussed briefly, and data which support a previously reported relaxation model are presented. At room temperature, the density dependencies of λ, (∂ lnλ/∂ lnρ)T, were 5.5 and 9.5 for the fcc and sc phases, which are values typical for an orientationally disordered phase and a normal crystal phase, respectively.

Place, publisher, year, edition, pages
1996. Vol. 54, no 5, 3093-3100 p.
Keyword [en]
Fullerenes, C60, high pressure, thermal conductivity, phase transition, phase diagram, glass transition, molecular orientation, plastic crystal
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-25955DOI: 10.1103/PhysRevB.54.3093OAI: oai:DiVA.org:umu-25955DiVA: diva2:235272
Available from: 2009-09-15 Created: 2009-09-15 Last updated: 2010-01-29

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Publisher's full texthttp://link.aps.org/doi/10.1103/PhysRevB.54.3093

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Andersson, OveSundqvist, Bertil

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