Preparation of NbN fibres by nitridation of sol-gel derived Nb2O5 fibres |
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| Authors: | Koichi Nomura Yutaka Takasuka Kanichi Kamiya Hiroyuki Nasu |
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| Affiliation: | (1) Research and Development Laboratories, Pola Corporation, 560 Kashio-cho, 244 Totsuka-ku, Yokohama, Japan;(2) Department of Chemistry for Materials, Faculty of Engineering, Mie University, Kamihama-cho, Tsu, 514 Mie, Japan |
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| Abstract: | Nbn fibres were prepared by nitriding sol-gel-derived Nb2O5 fibres. Precursor niobium-oxide-gel fibres were obtained by spinning viscous sots prepared through acid-catalysed hydrolysis of niobium penta-ethoxide, Nb(OC2H5)5. It was found that the spinnability of the sols depended on the water/alkoxide and the acid/alkoxide ratios. The niobium-oxide-gel fibres thus obtained were converted to niobium nitride by heat-treatment in a NH3 gas above 800°C. Characterization of these fibres was carried out using X-ray powder diffraction, Auger electron spectroscopy and scanning electron microscopy. The nitride fibres obtained at 1050°C were mostly of stoichiometric  -NbN phase, and they showed a transition to a superconducting state at around 11 K. |
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