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AssigneeHitachi, Ltd.
InventorsTakahiko Kato, Katsuzo Aihara, Jiro Kuniya, Yutaka Misawa, Yoshihide Wadayama, Masahiro Ogihara, Toshikazu Nishino, Ushio Kawabe, Haruhiro Hasegawa, Kazumasa Takagi, Tokuumi Fukazawa, Katsuki Miyauchi
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A process for controlling an oxygen content of a non-superconductive or superconductive oxide is provided, in which a beam of particles such as ions, electrons or neutrons or an electromagnetic radiation is applied to the non-superconductive or superconductive oxide of a perovskite type such as YBa.sub.2 Cu.sub.3 O.sub.7-x, thereby increasing or reducing the oxygen content of the oxide at the sites of oxygen in the crystal lattice of the oxide. Furthermore, a superconductive device such as a superconductive magnet, superconductive power transmission wire, superconductive transformer, superconductive shield, permanent current switch and electronic element is made by utilizing the process for controlling the oxygen concentration of the superconductive oxide.
A process for manufacturing a device having a pattern of a superconductor, which comprises applying an oxygen ion beam to a predetermined region of a non-superconductive oxide having a desired shape while heating said non-superconductive oxide to an elevated temperature and for a period of time sufficient to recover crystal lattices which exhibit superconductivity of said non-superconductive oxide to control, said oxygen content to approximately the stoichiometric amount of said oxide during application of said oxygen ion beam only in said predetermined region, an amount of oxygen ions applied being sufficient to convert the non-superconductive oxide in said predetermined region to the pattern of superconductive oxide to obtain the device, said superconductive oxide being selected from the group consisting of a perovskite oxide having a structure of A.sup.1.sub.1-x A'.sub.x B.sup.1 O.sub.3, wherein A.sup.1 is Ba, Pb, La, Pr or Nd, A' is Ca, Ba, Sr or Pb, and B.sup.1 is Cu, Mg, Mn, Fe, Co or Ni;
A process for manufacturing a device having a pattern of a superconductor, which comprises applying an energy beam selected from an electron beam, a neutron beam, a laser beam and an infrared ray beam to a predetermined region of a non-superconductive oxide having a desired shape while heating said non-superconductive oxide to an elevated temperature and for a period of time sufficient to recover crystal lattices which exhibit superconductivity of said non-superconductive oxide in an atmosphere containing oxygen gas to control said oxygen content to approximately the stoichiometric amount of said oxide during application of said energy beam only in said predetermined region, said energy beam having an energy sufficient to convert the non-superconductive oxide in said predetermined region to the pattern of superconductive oxide to obtain the device, said superconductive oxide being selected from the group consisting of a perovskite oxide having a structure of A.sup.1.sub.1-x A'.sub.x B.sup.1 O.sub.3, wherein A.sup.1 is Ba, Pb, La, Pr or Nd, A' is Ca, Ba, Sr or Pb, and B.sup.1 is Cu, Mg, Mn, Fe, Co or Ni;
A process for manufacturing a device having a pattern of superconductor, which comprises applying a beam of ions having an energy that is necessary for displacement of oxygen to reduce the oxygen content of shaped superconductive oxide at sites of oxygen in a crystal lattice of said oxide at selected regions of said superconductive oxide, said ions being one selected from the group consisting of titanium, vanadium, chromium, manganese, iron, cobalt, nickel, zinc, silicon, nitrogen, aluminum, magnesium, vanadium+oxygen, silicon+oxygen, silicon+nitrogen, magnesium+oxygen, and aluminum+oxygen, or applying a beam of hydrogen ions to reduce the oxygen content of said oxide at selected regions of said superconductive oxide, thereby converting the superconductive oxide to the non-superconductive oxide only at said selected regions, said selected regions being outside said pattern of superconductor, to obtain the deice, said superconductive oxide being selected from the group consisting of a perovskite oxide having a structure of A.sup.1.sub.1-x A'.sub.x B.sup.1 O.sub.3, wherein A.sup.1 is Ba, Pb, La, Pr or Nd, A' is Ca, Ba, Sr or Pb, and B.sup.1 is Cu, Mg, Mn, Fe, Co or Ni;
A process for manufacturing a superconductive oxide having a high critical current density in a magnetic field, which comprises applying a particle beam to the superconductive oxide in an amount sufficient to increase a critical current density of the superconductive oxide by forming radiation defects therein.
A process for manufacturing a superconductive device from a non-superconductive oxide formed in a desired shape of the device, which comprises applying an oxygen ion beam to a predetermined region of said non-superconductive oxide while heating said non-superconductive oxide to an elevated temperature and for a period of time sufficient to recover crystal lattices which exhibit superconductivity of said non-superconductive oxide to control said oxygen content to approximately the stoichiometric amount of said oxide only in said predetermined region, an amount of oxygen ions applied being sufficient to convert the non-superconductive oxide to the superconductive oxide in said predetermined region to obtain the device;
A process for manufacturing a device having a pattern of a superconductor, which comprises applying an energy beam selected from an electron beam, a neutron beam, a laser beam and an infrared ray beam to a predetermined region of a non-superconductive oxide having a desired shape while heating said non-superconductive oxide to an elevated temperature and for a period of time sufficient to recover crystal lattices which exhibit superconductivity of said non-superconductive oxide in an atmosphere containing oxygen gas to control said oxygen content to approximately the stoichiometric amount of said oxide only in said predetermined region, said energy beam having an energy sufficient to convert the non-superconductive oxide in said predetermined region to the superconductive oxide to obtain the device, said non-superconductive oxide having a composition which can be converted to that of said superconductive oxide by the application of said energy beam.
A process for manufacturing a device having a pattern of superconductor, which comprises applying a beam of ions having an energy that is necessary for displacement of oxygen to reduce the oxygen content of shaped superconductive oxide at sites of oxygen in a crystal lattice of said oxide at selected regions of said superconductive oxide, said ions being one selected from the group consisting of titanium, vanadium, chromium, manganese, iron, cobalt, nickel, zinc, silicon, nitrogen, aluminum, magnesium, vanadium+oxygen, silicon+oxygen, silicon+nitrogen, magnesium+oxygen, and aluminum+oxygen, or applying a beam of hydrogen ions to reduce the oxygen content of said oxide at selected regions of said superconductive oxide, thereby converting the superconductive oxide to the non-superconductive oxide only at said selected regions, said selected regions being outside said pattern of superconductor, to obtain the device.
Dependencies are inferred from the claim text.