| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an MgB<SB>2</SB>-based superconductor with high critical current density and high irreversible magnetic field. <P>SOLUTION: This MgB<SB>2</SB>-based superconductor is produced by forming a mixture of powders such as Mg powder, B powder, element M powder and sintering it (wherein, M is at least one kind selected among Ti, Zr and Hf). The atomic ratio is denoted as Mg:B:M=1:2:x (wherein, 0.001≤x≤0.1). M exists to be finely dispersed as a metal and/or a boride along the grain boundaries of MgB<SB>2</SB>and other inevitable impurities exist to be finely dispersed. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
