Methods of introduction of MgO nanoparticles into Bi-2212/Ag tapes

Abstract

The effect of addition of ultra-fine MgO particles, obtained by Mg combustion, in Bi-2212/Ag tapes was investigated. Bi-2212/Ag tapes were prepared by coating and partial melt processing. Four different methods of MgO particles embedment were applied in green tape preparation; settlement of MgO in Bi-2212, pre-mixing of MgO in the solvent, deposition of the MgO into the solvent, and deposition of MgO onto the surface of Bi-2212. Microstructural studies of processed tapes show that uniformity of MgO particles distribution in Bi-2212 matrix depends on the methods of tape preparation.MgO particles, introduced in Bi-2212 matrix by all applied methods, significantly enhanced transport properties of the tapes. The J c degradation with the increase of magnetic field and/or temperature in all doped samples was significantly lower compared to un-doped Bi-2212 samples. The best improvement was achieved when MgO particles were introduced into Bi-2212 matrix by settlement method of the tape coating. The improvement also depends on a magnitude of the magnetic field and operating temperatures.

Role of anti-ferromagnetic Cr nanoparticles in CuTl-1223 superconducting matrix

“…Ultra fine MgO nanoparticles were added to enhance the superconducting properties of Bi-2212/Ag tapes [14]. The effect of Al 2 O 3 nanoparticles on superconducting properties of YBa 2 Cu 3 O 7-δ was investigated and reduction in T c was observed, which was attributed to the insulating nature of these nanoparticles [15].…”

Effect of MgO nanoparticles embedded into Bi-2212/Ag tapes on the microstructure and superconducting properties

“…In our previous works, we have investigated the effect of addition of ultra-fine MgO particles on the microstructure and superconducting properties of Bi-2212/Ag tapes, prepared by a dip-coating and partial melting process [11,12]. It was found that significant enhancement in the magnetization hysteresis below the transition temperature could be achieved if ultra-fine MgO particles are individually dispersed in the Bi-2212 matrix [11].…”

“…On this basis, a number of procedures for the introduction of ultra-fine particles of MgO into the Bi-2212 matrix have been developed and used in order to obtain a uniform distribution throughout the Bi-2212 matrix and conserve them as individual particles [12]. It was found that significant enhancements in magnetization hysteresis could be achieved in tapes produced by the settlement method as well as the solvent deposit/mixing method (details are presented in Section 2), both providing sufficient uniformity of the flux pinning centers' distribution.…”

Magneto‐transport properties of polycrystalline YBa2(Cu1‐xMx)3O7‐δ (M = B and Mn)

“…Other techniques have been used during the sample preparation by changing the heat treatment where good quality samples might be obtained to carry high currents [6,7]. Introducing nano-particles in bulk superconductors has been also used to increase the pinning forces [8,9] and thus to enhance J c . Although great progress has been made to prepare HTSCs with high critical current density, some key problems are still unsolved so far.…”