2023 Volume 55 Article ID: 55-2
We have fabricated cylindrical and pipe-shaped Bi2212 superconductor samples using Melt-Casting Process. The purpose of this research is to create a superconductor with high-quality transport properties, based on the idea that if a hole is made in the cylinder to form a pipe, the surface area of the sample increases, making it easier for the reaction to proceed during sintering. First, two superconductors with the same composition ratio of Bi2212 but different shapes were fabricated simultaneously. Then, (a) crystal structure, (b) composition ratio, (c) critical temperature, and (d) critical current of the fabricated cylindrical and pipe-shaped samples were measured and compared. In (a), the X-ray diffraction pattern and lattice parameter confirmed that a superconductor sample with the Bi2212 structure can be fabricated using MCP. In (b), the amount of impurity carbon was lower in the pipe-shaped sample, suggesting that the pipe-shaped sample had a larger surface area, which allowed sufficient reaction with oxygen during sintering. In (c), the pipe-shaped sample had a higher critical temperature, but the difference was not significant. In (d), it was found that the critical current density was higher in the pipe-shaped sample. The ratio of the superconducting phase is large, and it is considered that the material became a uniform superconductor.
