Pressure-induced phase transitions in iron-filled carbon nanotubes: X-ray diffraction studies

Sukanta Karmakar, Surinder M. Sharma, P. V. Teredesai, and A. K. Sood
Phys. Rev. B 69, 165414 – Published 27 April 2004
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High-pressure x-ray-diffraction studies have been carried out upto 20 GPa on iron-filled multiwalled carbon nanotubes (MWNTs). The pressure dependence of the intertubular spacing d0 of the filled MWNTs shows a sharp change at 9 GPa which is not observed in pristine MWNTs. The iron present as nanowires inside the MWNT is in the form of α-Fe and Fe3C. Both of these phases show higher compressibility than their bulk form. Most interestingly, the structural modification of MWNTs at 9 GPa coincides with an iso-structural phase transition in the encapsulated Fe3C, in sharp contrast to the absence of a transition in the bulk Fe3C upto 70 GPa.

  • Received 8 September 2003


©2004 American Physical Society

Authors & Affiliations

Sukanta Karmakar1, Surinder M. Sharma1, P. V. Teredesai2, and A. K. Sood2,3

  • 1Synchrotron Radiation Section, Bhabha Atomic Research Centre, Mumbai 400085, India
  • 2Department of Physics, Indian Institute of Science, Bangalore 560012, India
  • 3Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research Centre, Jakkur Campus, Jakkur, Bangalore 560 064, India

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Vol. 69, Iss. 16 — 15 April 2004

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