caa a22 4500 388020458 CHVBK 20180307124922.0 cr unu---uuuuu 161130e199809 xx s 000 0 eng 10.1557/JMR.1998.0345 doi S0884291400045817 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0345 Synthesis, Structure, and Superconducting Properties of Tantalum Carbide Nanorods and Nanoparticles [Elektronische Daten] 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. Copyright © Materials Research Society 1998 Fukunaga Akihiko Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890 Chu Shaoyan Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890 McHenry Michael E. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890 Journal of Materials Research Cambridge University Press 13/9(1998-09), 2465-2471 0884-2914 13:9<2465 1998 13 JMR https://doi.org/10.1557/JMR.1998.0345 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0345 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fukunaga Akihiko Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890 NATIONALLICENCE 700 1- Chu Shaoyan Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890 NATIONALLICENCE 700 1- McHenry Michael E. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/9(1998-09), 2465-2471 0884-2914 13:9<2465 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge