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High-pressure synthesis, structural and Raman studies of a two-dimensional polymer crystal of \(\)

  • R. Moret
  • P. Launois
  • T. Wågberg
  • B. Sundqvist
  • 147 Downloads

Abstract:

Two-dimensional polymerisation of a C60 single crystal has been obtained under high-pressure high temperature conditions (700 K - 2 GPa). Crystalline order is preserved but the crystal splits into variants (orientational domains). The analysis of X-ray diffraction and Raman spectroscopy data reveals that the polymer crystal is primarily tetragonal with some admixture of rhombohedral phase. Furthermore, Raman spectroscopy gives evidence for additional C60-C60 dimers, which are probably disordered. For the tetragonal phase, it is shown that successive polymer layers are rotated by \(\) about the stacking axis, according to the P42/mmc space group symmetry. The structure of the rhombohedral phase is also clarified. The role of the interlayer interactions in stabilising the two-dimensional polymer phases of C60 is discussed.

PACS. 61.48.+c Fullerenes and fullerene-related materials - 61.50.Ks Crystallographic aspects of phase transformations; pressure effects 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2000

Authors and Affiliations

  • R. Moret
    • 1
  • P. Launois
    • 1
  • T. Wågberg
    • 2
  • B. Sundqvist
    • 2
  1. 1.Laboratoire de Physique des Solides (UMR 8502 du CNRS), Bâtiment 510, Université Paris-Sud, 91405 Orsay, FranceFR
  2. 2.Department of Experimental Physics, Umeå University, 90187 Umeå, SwedenSE

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