Synthesis, structure, and superconducting properties of tantalum carbide nanorods and nanoparticles

Akihiko Fukunaga, Shaoyan Chu, Michael E. McHenry

研究成果: Article

60 引用 (Scopus)

抄録

Tantalum carbide nanorods and nanoparticles have been synthesized using a vapor-solid reaction path starting with CVD grown carbon nanotube precursors. Their structures were studied using XRD, TEM, and HRSEM. Superconducting properties were characterized using a SQUID magnetometer. For reactions at lower temperatures, carbide nanorods, which replicate the ∼14 nm diameter of the precursor carbon nanotubes, are observed. For higher temperature reactions, coarsened carbide nanoparticles (100-250 nm) are observed which have spherical or cubic-faceted morphologies. A morphological Rayleigh instability is postulated as initiating the transition from nanorod to nanoparticle morphologies. Stoichiometric bulk TaC crystallizes in the rock salt structure and has a superconducting transition temperature of 9.7 K. In TaC nanorods and nanoparticles, the superconducting properties correlate with the lattice parameter. Nanoparticles with a little higher lattice parameter than the ideal one show higher Tc and higher fields at which the superconductivity disappears than stoichiometric bulk TaC.

元の言語English
ページ(範囲)2465-2471
ページ数7
ジャーナルJournal of Materials Research
13
発行部数9
DOI
出版物ステータスPublished - 1998 1 1
外部発表Yes

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Tantalum carbide
tantalum carbides
Nanorods
nanorods
Nanoparticles
nanoparticles
synthesis
Carbon Nanotubes
carbides
Lattice constants
Carbides
lattice parameters
Carbon nanotubes
carbon nanotubes
halites
SQUIDs
Magnetometers
Superconductivity
magnetometers
Superconducting transition temperature

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

Synthesis, structure, and superconducting properties of tantalum carbide nanorods and nanoparticles. / Fukunaga, Akihiko; Chu, Shaoyan; McHenry, Michael E.

:: Journal of Materials Research, 巻 13, 番号 9, 01.01.1998, p. 2465-2471.

研究成果: Article

Fukunaga, Akihiko ; Chu, Shaoyan ; McHenry, Michael E. / Synthesis, structure, and superconducting properties of tantalum carbide nanorods and nanoparticles. :: Journal of Materials Research. 1998 ; 巻 13, 番号 9. pp. 2465-2471.
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