Production of superconducting NbN thin plate and wire by the self-propagating high-temperature synthesis method

Synthesis and Characterization of Nanostructured Niobium and Molybdenum Nitrides by a Two-Step Transition Metal Halide Approach

“…There is a burgeoning interest recently on nanosized transition metal nitrides particularly because of the scientific and technological relevance of nanotechnology, owing largely to the enhanced physicochemical properties offered by the higher surface area and nanosized materials. Following these interests, many new nontraditional synthetic routes for producing nanosized transition metal nitrides have been developed during the last few years including ammonolysis of sulfide, 23–25 bromide, 26 dialkylamide and hexamethyldisilylamides, 27 thermal decomposition of metallo‐organic intermediates, 28,29 reaction of lithium amides and chlorides, 30 activated reactive evaporation, 31 solid‐state metathesis, 32 electrolysis of Mo metal in liquid NH 3 , 33,34 combustion synthesis (SHS) under high nitrogen pressure—temperature, 35–39 and mechanical alloying of the reactants in the presence of nitrogen flow 40 . Among these routes, ammonolysis of transition metal chlorides is one of the most suitable routes for obtaining nanosized nitrides because the reaction temperature is relatively lower than other methods.…”

Field-Swept NMR Spectra of 11B in Pyrex Glass and 93Nb in NbN Perturbed by Quadrupole Interaction

“…The production of NbN is not easy since it is necessary to quench the high-temperature phase. The method of self-propagating high-temperature synthesis (SHS) has been also tried to take advantages of the short reaction times, the higher-purity of the products, the lowenergy requirements and the relative simplicity of the method [3,4]. Although the combustion process is often incomplete, and unreacted metal or lower nitrides are left in the product, we rather expect in the case of superconduction that such defects make the flux-pinning force even stronger and make the critical current higher.…”

“…The method of sample preparation has been described in [3]. The magnetization of the powder of NbN synthesized by SHS as a function of an applied field or temperature has been measured by a commercial SQUID magnetometer (Quantum Design MPMS-5S).…”

Nuclear spin-lattice relaxation of 93Nb in a superconducting NbN synthesized by SHS

“…The production of NbN is not easy, since it is necessary to quench the high-temperature phase. The method of self-propagating high-temperature synthesis (SHS) has also been tried to take advantage of the short reaction times, the higher-purity of the products, the low-energy requirements and the relative simplicity of the method [2,3]. Although the combustion process is often incomplete and unreacted metal or lower nitrides are left in the product, we rather expect in the case of a superconductor that such defects make the flux-pinning force even stronger and make the critical current higher.…”