Control of partially melted microstructure and critical current density for Bi-2212 tapes

Abstract

Listen

Translate article

Bi2Sr2CaCu2Ox (Bi-2212)/Ag tapes have been prepared using an isothermal partial melting (IPM) method under controlled atmospheres, in which partial melting and solidification have been carried out at the same temperature but under different atmospheres. Maximum critical current density (Jc) at 4.2 K under 0 T is 1.9×105 and 3.0×105 A/cm2 for tapes prepared at 830 and 865 °C, respectively. This difference in Jc is attributed to a microstructural difference. Bi-2212 grain size can be controlled by melting temperature and both amount of impurities and grain coupling strength can be controlled by solidification time.