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HRTEM studies of cobalt-filled carbon nanotubes / V. D. Blank in Acta materialia, Vol. 58 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1293–1298 Titre : HRTEM studies of cobalt-filled carbon nanotubes Type de document : texte imprimé Auteurs : V. D. Blank, Auteur ; B.A. Kulnitskiy, Auteur ; I.A. Perezhogin, Auteur Année de publication : 2011 Article en page(s) : pp. 1293–1298 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Transmission  electron  microscopy  Carbon  Graphite  Nanocrystalline  materials  Deformation  structure Résumé : Cobalt-filled carbon nanotubes were synthesized at high temperature and high gas pressure. A high-resolution transmission electron microscopy study demonstrates that the product of the synthesis contains cylindrical carbon nanotubes whose cores are filled with cobalt nanoparticles or nanorods. It is shown that cobalt appears inside the nanotubes in three basic modifications: face-centered cubic (fcc) lattice, hexagonal close-packed (hcp) lattice and disordered polytypic structure. The fcc lattice is often twinned, with two or more non-parallel twinning planes being observed. The orientations of the fcc and hcp cobalt particles with respect to the nanotubes were investigated. The authors believe that the variety of cobalt modifications inside the nanotubes is due to the process of segregation of the closely packed structures from the melt. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007277 [article] HRTEM studies of cobalt-filled carbon nanotubes [texte imprimé] / V. D. Blank, Auteur ; B.A. Kulnitskiy, Auteur ; I.A. Perezhogin, Auteur . - 2011 . - pp. 1293–1298. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1293–1298 Mots-clés : Transmission  electron  microscopy  Carbon  Graphite  Nanocrystalline  materials  Deformation  structure Résumé : Cobalt-filled carbon nanotubes were synthesized at high temperature and high gas pressure. A high-resolution transmission electron microscopy study demonstrates that the product of the synthesis contains cylindrical carbon nanotubes whose cores are filled with cobalt nanoparticles or nanorods. It is shown that cobalt appears inside the nanotubes in three basic modifications: face-centered cubic (fcc) lattice, hexagonal close-packed (hcp) lattice and disordered polytypic structure. The fcc lattice is often twinned, with two or more non-parallel twinning planes being observed. The orientations of the fcc and hcp cobalt particles with respect to the nanotubes were investigated. The authors believe that the variety of cobalt modifications inside the nanotubes is due to the process of segregation of the closely packed structures from the melt. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007277