Spectroscopic study of phase transformations between orthorhombic and tetragonal C60 polymers

Condensed Matter Physics

Document identifier: oai:DiVA.org:ltu-7777
Access full text here:10.1140/epjb/e2006-00030-4
Keyword: Natural Sciences, Physical Sciences, Other Physics Topics, Naturvetenskap, Fysik, Annan fysik
Publication year: 2006
Abstract:

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 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.

Authors

Thomas Wågberg

Department of Physics, Umeå University
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Alexander Soldatov

Luleå tekniska universitet; Materialvetenskap
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Bertil Sundqvist

Department of Physics, Umeå University
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