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Spectroscopic study of phase transformations between orthorhombic and tetragonal C60 polymers
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
2006 (English)In: The European Physical Journal B: Condensed Matter and Complex Systems, ISSN 1434-6028, Vol. 49, no 1, 59-65 p.Article in journal (Refereed) Published
Abstract [en]

We present a detailed study of transformations between the orthorhombic and tetragonal polymeric states of C60. The transformations are characterised by Raman spectroscopy and X-ray diffraction. We show that the transformation from the orthorhombic (O) phase to the tetragonal (T) phase is very fast and our results indicate that the transformation goes via an intermediate dimer (D) state in a two-stage process, O↦D and, D↦T transformations, where the second process is slower than the first. On the other hand, the transformation from the tetragonal to the orthorhombic phase is significantly slower, indicating a high-energy threshold to break the polymer bonds at the temperatures used. The results also support earlier suggestions that the tetragonal phase contains disordered dimers that can be viewed as lattice defects in the formation of higher polymers.

Place, publisher, year, edition, pages
2006. Vol. 49, no 1, 59-65 p.
Keyword [en]
C60, fullerenes, high pressure, polymers, orthorhombic, tetragonal, phase transformation, structural transformation, high pressure, high temperature, Raman spectroscopy, X-ray diffraction, XRD, dimers
National Category
Condensed Matter Physics
URN: urn:nbn:se:umu:diva-12180DOI: doi:10.1140/epjb/e2006-00030-4OAI: diva2:151851
Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2011-01-11Bibliographically approved

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Wågberg, ThomasSundqvist, Bertil
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Condensed Matter Physics

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