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Lattice vibrations and thermodynamic stability of polymerized C60 deduced from heat capacities
Umeå University, Faculty of Science and Technology, Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Physics.
1999 (English)In: Journal of Chemical Physics, ISSN 0021-9606, Vol. 110, no 24, 12226-12232 p.Article in journal (Refereed) Published
Abstract [en]

Heat capacities of 1D and 2D pressure polymerized C60 as well as the thermally depolymerized C60 have been measured at temperatures between 4 and 350 K and the results analyzed for the lattice vibrations and the thermodynamic stability. It was found from the low-temperature heat capacity (T < 100 K) that on polymerization (1) the lattice vibrations, both translational and rotational, stiffen substantially, (2) an anisotropic nature emerges in response to the lower dimensionality, and (3) an anharmonicity still remains as in pristine C60. The normal C60 has an excess entropy of 67.8 and 99.4 J K – 1 mol – 1 at 300 K relative to the 1D and 2D polymerized C60, respectively. The thermodynamic stability is considered with two possible phase diagrams.

Place, publisher, year, edition, pages
American Institute of Physics , 1999. Vol. 110, no 24, 12226-12232 p.
Keyword [en]
Fullerenes, C60, specific heat, heat capacity, polymer, dimer, high pressure synthesis, lattice dynamics, phase diagram, phase stability, plastic crystal, entropy, order-disorder transformation, one-dimensional polymer, two-dimensional polymer
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-23199DOI: 10.1063/1.479160OAI: diva2:221318
Available from: 2009-06-04 Created: 2009-06-04 Last updated: 2010-01-25

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Fransson, ÅkeSundqvist, Bertil
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