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Magnetic properties of mixed graphite containing both hexagonal and rhombohedral forms

  • S. Chehab
  • K. Guérin
  • J. Amiell
  • S. Flandrois

Abstract:

Magnetic properties of graphite materials containing variable fractional amounts (up to 40%) of the Rhombohedral graphite form have been investigated by means of electron spin resonance. The variations with temperature and rhombohedral content of the Landég-factor, ESR linewidth and paramagnetic spin-susceptibility have been analyzed. A narrow parallelism in the behaviours of the g-factor, linewidth and diamagnetic susceptibility (as the latter is known from an earlier work by Gasparoux) has been perceived, conforming to a similar parallelism between these three physical quantities present in earlier works on graphitic-type systems, but there, as a function of high-temperature-treatment and dopant concentration. From the g-value results, the g-anisotropy of the rhombohedral structure is inferred. The paramagnetic spin-susceptibility shows an increased tendency toward 2D character with increased rhombohedral content, in agreement with the theoretical predictions of McClure concerning (hypothetical) rhombohedral graphite.

PACS. 81.05.Tp Fullerenes and related materials; diamond, graphite - 76.30.-v Electron paramagnetic resonance and relaxation - 75.30.Gw Magnetic anisotropy 

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Copyright information

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

Authors and Affiliations

  • S. Chehab
    • 1
  • K. Guérin
    • 1
  • J. Amiell
    • 1
  • S. Flandrois
    • 1
  1. 1.Centre de Recherche Paul Pascal, CNRS, avenue A. Schweitzer, 33600 Pessac, FranceFR

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