Characterization of phases synthesized close to the boundary of C-60 collapse at high temperature high pressure conditions

A. Dzwilewski, A. Talyzin*, G. Bromiley, S. Dub, L. Dubrovinsky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Two sets of samples were synthesized at high pressure high temperature conditions in the P-T region where C-60 molecules collapse into a nearly amorphous graphite-like hard carbon phase. For the first set, heating temperature was varied at fixed pressure and preparation time. For the second set, synthesis time was varied at fixed pressure and fixed temperature. Detailed structural characterization of samples was performed using Raman spectroscopy and powder XRD. Mechanical properties of the samples have been studied by nanoindentation method. It has been found that duration of heat treatment under high pressure is an important parameter which influences the temperature of fullerene cage collapse. Both tetragonal and rhombohedral polymeric phases transform into hard carbon phase over a rather narrow temperature interval, but the tetragonal phase shows somewhat increased stability against C-60 collapse. Viscoelastic mechanical behavior during nanoindentation was observed for fullerene polymers but not for graphite-like hard carbon phase. Possible mechanism for nucleation of the hard carbon phase in polymeric C-60 networks is discussed. (c) 2007 Published by Elsevier B.V.

Original languageEnglish
Pages (from-to)1550-1556
Number of pages7
JournalDiamond and related materials
Volume16
Issue number8
DOIs
Publication statusPublished - Aug 2007

Keywords

  • fullerene
  • nanoindentation
  • high pressure
  • viscoelasticityt
  • X-RAY-DIFFRACTION
  • POLYMERIZED PHASES
  • TETRAGONAL PHASE
  • FULLERITE C-60
  • CARBON
  • RAMAN
  • FULLERENES
  • HARDNESS

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