The Influence of Y2Ba4CuNbO x Nanoparticle Addition on the Superconducting Properties of Single Domain YBCO Bulks

High-Efficient Method for Introducing Nanometer Y2Ba 4 CuNbO x Flux Pinning Centers in Single-Domain YBa2Cu3O7−δ Bulk Superconductors by TSIG Process

“…Periodic macrosegregated bands are observed on the surface of single grains in the vicinity of seeds, whereas the surface becomes smooth far away seed regions. This result is in well agreement with the previous reports [15,20]. More important, no spontaneous nucleation grains were observed in these samples.…”

“…1. All of the samples in batches were heated and annealed with a heating profile which is in agreement with our previous work [15]. The microstructure of the samples were observed using the scanning electron microscope (SEM, Quanta 200) and the levitation forces were measured with a homemade system at liquid nitrogen temperature [16].…”

“…It is quite different from the results by direct addition of YNb2411 mentioned in the refs. [15,18,19]. Therefore, it can be concluded that the segregation of YNb2411 can be effectively suppressed by addition of Nb 2 O 5 In addition, it can be seen that there are a clearly increasing trend of the pores density in the YBCO matrix with the increase of Nb 2 O 5 amount.…”

“…According to ref. [15], more than 10 wt% additions of YNb2411 in the YBCO bulks will result in the serious random nucleation during the growth process. The result suggests that the growth of singledomain YBCO bulks, with the secondphase particle YNb2411, is more steady by addition of Nb 2 O 5 rather than direct addition of YNb2411.…”

Enhanced superconducting properties in infiltration processed Y–Ba–Cu–O single-grain superconductor with nano-sized pinning centers

“…Considering the sample diameter is 16 mm, the maximum force density is calculated as 14.47 N/cm 2 . This performance is clearly higher than that observed in YNb2411-doped YBCO sample under an optimum doping amount, which is about 13.53 N/cm 2 (42.50 N for a sample diameter 20 mm) [30]. The result emphasizes the high performance and practical utility of the YBCO sample fabricated using the novel TSIG technique, besides its simplicity and high efficiency.…”