ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01026967
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