Add time:07/28/2019         Source:sciencedirect.com

In the system Ba–Nb–O–N a superconducting ceramic material with Tc=22 K was synthesized. The temperature dependencies of magnetic susceptibility and resistivity of these ceramics with different oxygen concentrations was studied. A large increase of Tc was observed, from 12 K for samples prepared in O2 up to 23 K prepared in air due to the variation of oxygen composition and Y doping. The XRD structure and Auger electron spectroscopy composition investigations indicate the formation of oxinitrides BaNbOxNy with a cubic structure having a lattice parameter a=4.32 Å, which is apparently responsible for the highest Tc observed. The incorporation of nitrogen into the crystal lattice results in an increase of Tc and stabilization of the superconducting structure.

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