2023 Volume 55 Article ID: 55-1
In order for Bi2212 superconductors to exhibit good transport properties, they must be sintered at a high temperature, usually around 860℃. If the sintering temperature is too high, the performance of the superconductor will be deteriorated by the diffusion of the substrate components into the sample when the superconductor is applied to electronic devices. Therefore, we investigated the effect of calcination conditions on the transport properties of low-temperature sintered Pr-doped Bi2212 superconductor, aiming to prepare samples at a lower temperature (700℃) than in previous studies by controlling the number of sintering cycles. In this study, the composition of Bi2.05Sr1.89Ca1.06Cu2Li0.15Oy and Pr2O3 were added as additives, and the samples were sintered at 700℃ for one, two, and three times of calcination, respectively, and the resistivity temperature characteristics, crystal structure, and carbon concentration of the samples were measured. As a result, the sample calcinated one time showed no zero resistance, and the critical temperatures of the samples calcinated two and three times were 56K and 68K, respectively. The crystal structure of the sample sintered at 700℃ showed peaks similar to those of normal Bi2212. Furthermore, the amount of carbon in the samples decreased as the number of times of calcination was increased.
