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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, P. V. and Sood, A. K. (2004) Pressure-induced phase transitions in iron-filled carbon nanotubes: X-ray diffraction studies. Physical Review B, 69 (16). p. 165414. ISSN 1098-0121

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Official URL: http://prola.aps.org/abstract/PRB/v69/i16/e165414

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 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.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:4378
Deposited By:JNCASR
Deposited On:02 Apr 2009 12:32
Last Modified:02 Apr 2009 12:32

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