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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4806

Title: Pressure-induced phase transitions in cobalt-filled multiwalled carbon nanotubes
Authors: KARMAKAR, S
TYAGI, PK
MISRA, DS
SHARMA, SM
Keywords: compressibility
temperature
equation
state
gpa
Issue Date: 2006
Publisher: AMERICAN PHYSICAL SOC
Citation: PHYSICAL REVIEW B, 73(18), -
Abstract: High-pressure structural properties of cobalt nanowires encapsulated in multiwalled carbon nanotubes have been investigated up to a pressure of similar to 38 GPa at room temperature. Our x-ray diffraction measurements show that cobalt, which exists in the face-centered-cubic (fcc) phase at ambient conditions in the carbon nanotubes, transforms irreversibly to a hexagonal close-packed (hcp) structure at similar to 9 GPa. In comparison with the bulk Co, the compressibility of the fcc phase in nanowires is found to be similar to that of the high-pressure fcc phase [Phys. Rev. Lett. 84, 4132 (2000)] and the hcp phase is slightly less compressible than the bulk. Multiwalled carbon nanotubes that encapsulate the cobalt nanowires do not undergo any other structural transformation with pressure except partial reversible amorphization beyond 9 GPa.
URI: http://dx.doi.org/10.1103/PhysRevB.73.184119
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4806
http://hdl.handle.net/10054/4806
ISSN: 1098-0121
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