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Graphite encapsulated nanocrystals produced using a low carbon : metal ratio

Published online by Cambridge University Press:  31 January 2011

Jonathon J. Host ,
Mao H. Teng ,
Brian R. Elliott ,
Jin-Ha Hwang ,
Thomas O. Mason ,
D. Lynn Johnson  and
Vinayak P. Dravid
Jonathon J. Host
Affiliation:
Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208
Mao H. Teng
Affiliation:
Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208
Brian R. Elliott
Affiliation:
Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208
Jin-Ha Hwang
Affiliation:
Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208
Thomas O. Mason
Affiliation:
Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208
D. Lynn Johnson
Affiliation:
Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208
Vinayak P. Dravid
Affiliation:
Department of Materials Science and Engineering & Materials Research Center, Northwestern University, Evanston, Illinois 60208
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Abstract

Graphite encapsulated nanocrystals produced by a low carbon tungsten arc were analyzed to determine their chemistry, crystallography, and nanostructural morphology. Metallic nanocrystals of Fe, Co, and Ni are in the face-centered cubic (fcc) phase, and no trace of the bulk equilibrium phases of body-centered cubic (Fe) and hexagonal close-packed (Co) were found. Various analytical techniques have revealed that the encased nanocrystals are pure metal (some carbide was found in the case of Fe), ferromagnetic, and generally spherical. The nanocrystals are protected by turbostratic graphite, regardless of the size of the nanocrystals. The turbostratic graphite coating is usually made up of between 2 and 10 layers. No trace of any unwanted elements (e.g., oxygen) was found. The low carbon: metal ratio arc technique is a relatively clean process for the production of graphite encapsulated nanocrystals.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 5 , May 1997 , pp. 1268 - 1273
Copyright
Copyright © Materials Research Society 1997

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