We report on the evolution of phases upon cooling of partially-melted Bi-Sr-Ca-Cu-Li-0 powders and tapes and on enhanced magnetic flux-pinning through irradiation. Enhanced resistive transitions have been obtained despite significant amounts of (Sr1-δ,Caδ)nCuOx phases (where n=l or 2). Here, the evolution of phases is investigated in Li-doped and undoped 2212 via extensive mi-crostructural characterizations. To enhance the flux-pinning, we have neutron irradiated Li-doped and undoped 2212. In addition to the neutron-collision-induced damage, the n+6Li -> 3T+4a+4.89 MeV and the n + 7Li -> 3T + 4a + n - 2.5 MeV fission reactions produce a homogeneous distribution of high and low energy charged particles. Effects of irradiation upon the magnetically measured Tc and JCim(H) are reported. Differences between the effects upon doped and undoped superconducting powders are discussed to highlight the effects of the charged particle damage.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering