Improved chemical stability of Ti-doped MgB₂ in water

We investigated the degradation of critical current density (J_c) and irreversibility field (H_irr) of pure and Ti-doped MgB ₂ bulks by exposing the samples to water for a total of 10, 48, 100, and 124 h. We found that both J_c and H_irr of the samples were degraded by exposure to water, in various degrees depending on the doping level. In the same exposure duration, the Ti-doped samples exhibited a less sensitivity to water, which was confirmed by the less degradation of J _c and H_irr. Our results demonstrate that Ti doping is not only effective in improving the superconducting properties of MgB₂ but also in enhancing its chemical stability against water.