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

Karmakar, Sukanta and Sharma, Surinder M and Teredesai, PV and Sood, AK (2004) Pressure-induced phase transitions in iron-filled carbon nanotubes: X-ray diffraction studies. In: Physical Review B (Condensed Matter and Materials Physics -15(II)), 69 (16). pp. 165414-1.

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Abstract

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 alpha-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.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Physical Society (APS)
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 23 Aug 2004
Last Modified: 19 Sep 2010 04:14
URI: http://eprints.iisc.ernet.in/id/eprint/1316

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