Preparation of 18-filament Cu/NbZr/MgB2 tape with high transport critical current density

Cu-stabilized 18-filament MgB2 tapes with NbZr buffer have been fabricated by using powder-in-tube technique. The phase composition and microstructure were examined by X-ray diffraction and optical microscopy. Transport critical current measurements were performed by a standard four-probe technique at different magnetic fields and temperature. The sample shows a high transport critical current density of 80,000A/cm2 (10K,0T) and 13,600A/cm2(10K,1T)