Jc properties of Ag-sheathed Bi2223 tapes with Sr-V-oxide barriers

Ag-sheathed Bi2223 multifilamentary tapes with and without a layer of Sr6V2O11(SVO) barrier outside and inside each filament were prepared. The SVO barrier layers have no bad effects on the critical current density Jc of the tapes. Especially, Jc increases obviously in the tapes coated with SVO layers both inside and outside each filament, due to the enhancement of Bi2223 phase formation by the reaction of the inside-coated SVO with Bi-based oxide core. This results suggest that even if the SVO barriers react with Bi oxide core due to the break of Ag sheath, the reaction have no bad effect, rather good effect on the Jc values. SVO will be one of most important candidates for barriers.