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Preparation and superconductivity of NbN powder by a vapour phase reaction

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Abstract

The formation of superconducting NbN powders by the vapour phase reaction of the NbCl4-NH3-H2 system has been investigated. The properties of NbN powders changed with the reaction temperature, mixing temperature of NbCl4 and NH3, and gas composition ratio ([NH3]/[NbCl4]). The reaction system gave NbN powders consisting of particles with sizes less than 50 nm. The process of particle formation is discussed. The NbN powders produced had vacancies at both the Nb and N sublattices. The vacancies influenced the superconducting transition temperature (T c) of NbN, the highestT c observed being 14.1 K.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 812, Fukuoka, Japan

    T. Watari, Y. Takakura, M. Murakami & A. Kato

Authors
  1. T. Watari
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  2. Y. Takakura
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  3. M. Murakami
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  4. A. Kato
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Watari, T., Takakura, Y., Murakami, M. et al. Preparation and superconductivity of NbN powder by a vapour phase reaction. J Mater Sci 19, 2915–2920 (1984). https://doi.org/10.1007/BF01026967

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  • DOI: https://doi.org/10.1007/BF01026967

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