The effect of temperature gradient on the morphology of YBCO bulk superconductors by melt texture growth processing

Effect of Cooling Time on the Morphology and Levitation Force of Single‐Domain Gd–Ba–Cu–O Bulk Superconductors by the Infiltration and Growth Technique

“…Finally, a well‐textured NdBCO crystal of dimensions 2 mm × 2 mm × 1 mm was placed on the top surface of the Gd‐211 green compact with the ab ‐plane parallel to the surface. Then, the sample was put in a self‐designed tube furnace with appropriate temperature gradient, which can effectively prevent the random nucleation of GdBCO grains at the edges of samples 25 …”

“…Then, the sample was put in a self-designed tube furnace with appropriate temperature gradient, which can effectively prevent the random nucleation of GdBCO grains at the edges of samples. 25 The samples were heated rapidly up to 10601C, and held for 1 h to ensure complete peritectic decomposition of the Gd-123 phase in the liquid source pellet and to ensure complete infiltration of liquid into Gd-211 preform, then rapidly cooled to 10351C at a rate of 601C/h, and then cooled slowly to 10151C within different times (from 20 to 90 h in steps of 10 h) before furnace-cooled to room temperature. After completion of seeded IG process, the single grains were annealed in flowing oxygen for 200 h at temperatures ranging from 4501 to 3501C.…”

Fabrication of single-grain GdBa2Cu3O7−x bulk superconductors with a new kind of liquid source by the top seeded infiltration and growth technique

“…Nd-123 was used as a seed to initiate single-grain Gd-123 nucleation. Then the samples were put in a tube furnace with appropriate temperature gradient which can effectively prevent the random nucleation of GdBCO grains at the edges of samples [14]. The samples were heated to 800 • C for 8 h, and subsequently up to 1060 • C for 5 h (a rather low heating rate is employed in this stage for avoiding slope or collapse of the sample by the rapid melt of BaCuO 2 phase), and held for 1 h to ensure complete infiltration of liquid into Gd-211 preform, cooled to 1035 • C at a rate of 60 • C/h, and then cooled slowly to 1015 • C at a rate of 0.2-0.5 • C/h before furnace-cooled to room temperature.…”

Improvement on the melt-texturing performance of a (Y,Ta)0.5BaO3–YBa2Cu3Oy composite with superconductor applications

“…Mechanical behavior is intimately associated with the resulting texture and the microstructure array, and these are strongly controlled by the operational variable conditions. Yang et al [25] have investigated the effect of the thermal gradient and levitation force on the Y123 bulk. They clearly revealed that a positive lateral nucleation of the Y123 grain is more effective.…”