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

Akihiko Fukunaga, Shaoyan Chu, Michael E. McHenry

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2465-2471
Number of pages7
JournalJournal of Materials Research
Volume13
Issue number9
DOIs
Publication statusPublished - 1998 Jan 1
Externally publishedYes

Fingerprint

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

Cite this

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

In: Journal of Materials Research, Vol. 13, No. 9, 01.01.1998, p. 2465-2471.

Research output: Contribution to journalArticle

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