The effect of excess Y2O3 addition on the levitation force of melt processed YBCO bulk superconductors

Comparison of Y<sub>2</sub>Ba<sub>4</sub>CuBiOy Nanoparticles with CeO<sub>2</sub> Doping on the Levitation Force of Single Domain YBCO Bulk Superconductor by TSIG Process

“…High temperature superconductor (HTS) has been one of the international hotspots and impotent research contents all over the world [1]. Because of the high critical temperature, strong trapped flux density, large magnet levitation force and stable suspension characteristics, the single domain YBCO superconductors have significant potential for various applications, such as high field permanent magnets, magnetic bearing, flywheel, levitated transportation systems, motors, generators, and maglev systems, etc.…”

“…Furthermore, the particles of Y 2 BaCuO 5 (Y211) are an effective flux pinning center for single domain YBCO bulk superconductors, but the particle size is a little larger, from several micrometers to more than ten micrometer range. It is difficult to reduce the Y211 particle to the size less than 1 μm and improve the flux pinning force further, even if Pt is added to reduce the Y211 particle [1] [10] [11] [12] [13]. So effective artificial pinning centers have to be introduced to improve J c of these materials [14].…”

Influence of ZnO doping on the properties of single domain YBCO bulks fabricated by RE+011 TSIG process

“…particles 10,11 have been introduced into the YBCO matrix to enhance its critical current density, levitation forces, trapped magnetic field; moreover, Pt and CeO2 have also been added to refine the Y211 particle size for further improving its superconducting properties. [12][13][14] These additions can improve superconducting properties but do not influence the T c of YBCO bulks, however, the Y211 particle size is very difficult to be reduced to nanometers. Nano-size flux pinning centers can be introduced into the YBCO matrix to enhance its physical properties by electron, neutron and heavy ion irradiation, [15][16][17] but it is not so convenient for wide applications.…”

A generic process to introduce nanoparticles into powder preforms and its application to Infiltration Growth processing of REBa2Cu3O7 superconductor

“…Enhanced surface area of fine-sized Y-211 inclusions, arising from large curvatures at their interface with the 123 matrix, gives rise to increased interfacial defect densities due to lattice mismatch [17]. Dopants like Y 2 O 3 [18], CeO 2 [19], ZrO 2 [13], BaCeO 3 [14], Al 2 O 3 [20], NiO [21], etc. have been explored in the literature as fine second phase particles in the 123 matrix; some of such additives had the ability to refine the size of the Y-211 precipitates residual in the RE-123 matrix after the process.…”