The aim of this paper was to study the effect of nanoscale inclusions of CuO as the second ingredient of composites on transport properties of superconducting YBa 2 Cu 3 O 7 polycrystals. The samples of YBa 2 Cu 3 O 7−δ with different content of CuO nanoparticles were synthesized. The analysis of the magnetic properties was carried out within the extended critical state model. It was found that the addition of 0.5 and 1% of CuO nanoparticles leads to an increase in the intragranular density of the critical current at T = 4.2 K. A further increase of x from 2 to 15% and more than 40% decreases the critical current density. The critical current density higher than in the reference sample was also found in the samples with x = 20% and x = 24%.
The laws governing the formation of residual stresses in copper oxide nanoparticles in the process of their direct plasma-chemical synthesis in a low-pressure arc discharge plasma are studied. Correlation dependences of the residual stress and the magnetization of nanoparticles on the pressure of the gas mixture of 10% O 2 + 90% Ar are presented. The problems associated with the bifurcation of the magnetization curves during cooling in zero (ZFC) and non-zero (FC) magnetic field, non-equilibrium behavior, relaxation of magnetization and magnetic viscosity of the obtained CuO nanoparticles are discussed.
The influence of CuO nanoscale inclusions as the second component of the composites on the transport properties of superconducting polycrystals YBa 2 Cu 3 O 7 was studied. Samples of YBa 2 Cu 3 O 7-δ with different content of CuO nanoparticles were synthesized. The analysis of magnetic properties was carried out within the framework of the extended critical state model. It was found that the addition of 20 wt.% CuO nanoparticles leads to an increase in the critical current density at T = 77 K. A further increase to 30 wt.% reduces the critical current density. The results of the experimental studies of a switching superconducting fault current limiter in AC voltage networks based on high-temperature superconductors (HTSC) of the 2 nd generation are given in this work. The testing equipment contains a series-connected HTSC module and a highspeed current switch with a break time of 9 ms. The high efficiency of the samples made from the YBa 2 Cu 3 O 7-δ + CuO nanocomposite material as an active element of a resistive current limiter is shown.
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