| 摘要 |
PURPOSE:To produce a superconductor exhibiting a high critical current density even in a magnetic field by increasing the transport critical current density of a superconductor composed of an oxide superconductive substance already having a pinning center in the inside of its crystal grain. CONSTITUTION:In a superconductor composed of a superconductive substance containing Cu, Tl, Sr, Ca and O as the main elements, a process of heat treatment of a liquid phase composed mainly of Ba, Pb and O is carried out in the presence of a solid phase as a superconductive substance phase on the course of its production processes. As the liquid phase component generated in these processes, a material not causing decomposition of the superconductive substance and improving mutual junction between superconductive substance grains is desirable. As the effective liquid phase performing this role when producing a superconductor using a superconductive substance composed mainly of Cu, Tl, Sr, Ca and O, a liquid phase composed mainly of Ba, Pb and O is preferable, thus producing the objective superconductor, superconductor wire material and superconductor magnet capable of using not only under cooling by liquid helium but under cooling by liquid nitrogen and composed of an oxide superconductive substance exhibiting a high superconductivity critical current density even in a high magnetic field. |
