The effects of Li on Ag-sheathed Bi2Sr2CaCu2O8+x tapes have been studied by considering Li substitutions for Sr and Cu and Li additions to stoichiometric Bi2Sr2CaCu2O8+x. The materials were prepared by the powder-in-tube method. As the Li substitution reduces the melting temperature by as much as 160 K, careful control of the processing conditions is required to obtain superconductivity in Li-doped samples. Here we report on the effects upon Jc(B,T) and upon Tc. Jc(B) at 4.2 K and 20 K are reported. Due to a lack of phase purity, Li reduced the overall Jc of the tapes. At 20 K, however, the Li-doped material is much less dependent upon B, indicating that Li substitution may provide enhanced pinning at high field.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering