International Superconductivity Technology Center

Kyushu Electric Power Co., Inc.

Fujikura Limited

Hitachi Cable, Inc.

Ishikawajima-harima Jukogyo Kabushiki Kaisha

Mitsubishi Cable Industries, Ltd.

The Kansai Electric Power Co., Inc.

Hokkaido Electric Power Company, Inc.

Kyocera Corporation

Asahi Glass Company, Limited

Sumitomo Metal Industries, Inc.

Japan Energy Corporation

Railway Technical Research Institute

Minoru Tagami

Shoji Tanaka

Yuh Shiohara

Yasuji Yamada

Kanshi Ohtsu

Masaru Nakamura

Atsushi Kume

Noriyuki Tatsumi

Jiro Tsujino

Yasuo Kanamori

Yuichi Nakamura

Teruo Izumi

Xin Yao

Kengo Ishige

Makoto Kambara

Hideki Sakai

Koichi Uehara

The present invention is aimed to provide a means for manufacturing a RE123 system oxide superconductor showing good superconductivity characteristics under atmospheric ambiance. In a method of manufacturing a RE123 system oxide superconductor by melting, cooling and solidifying material including rare-earth elements and a Ba--Cu--O solvent for crystallization such as by the crystal pulling method, examining beforehand the relationship between the melted material composition and the equilibrium liquid-phase composition and the crystal composition of the RE123 system oxide superconductor formed therefrom in atmospheric ambiance, and based on the result of said examination, adjusting the average composition of the material or the composition of the solvent (for example, setting the average composition of the material to an area where the superconductivity phase and the liquid phase coexist in equilibrium, and at the same time adjust the 'Ba/Cu' ratio of the melted material to 3/5-1/1, or adjust the 'Ba/Cu' ratio of the solvent inside the crystal pulling crucible to 3/5-1/1), in order to control the amount of mutual substitution between RE and Ba (control the value of x in RE123 system superconductor RE.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-d to 0-0.05 and the like) for crystallization.

Method of manufacturing oxide superconductors

A composite material is disclosed which includes a substrate, an oriented film provided on a surface of the substrate and formed of a crystal of a Y123 metal oxide of the formula LnBa.sub.2 Cu.sub.3 O.sub.y wherein Ln stands for Y or an element belonging to the lanthanoid and y is a number of 6-7, and a layer of a Y123 metal oxide of the formula LnBa.sub.2 Cu.sub.3 O.sub.y wherein Ln stands for Y or an element belonging to the lanthanoid and y is a number of 6-7 formed on the oriented film.

Composite metal oxide material

Method of producing composite metal oxide material

A method of preparing a crystal of a Y-series 123 metal oxide is disclosed, in which a substrate is immersed in a liquid phase which comprises components constituting the metal oxide. The liquid phase contains a solid phase located at a position different from the position at which the substrate contacts the liquid phase. The solid phase provides the liquid phase with solutes which constitute the Y-series 123 metal oxide so that the solutes are transported to the position at which the substrate and the liquid phase contact, thereby permitting the Y-series 123 metal oxide to grow on the substrate as primary crystals.

Method of preparing metal oxide crystal

A composite material comprising a bulky substrate of a Y-series 123 metal oxide crystal, and at least one layer provided on a surface of the substrate and formed of a crystal of a Y-series 123 metal oxide. The substrate may be produced by immersing a seed material in a liquid phase which comprises components constituting the metal oxide. The liquid phase contains a solid phase located at a position different from the position at which the seed material contacts the liquid phase. The solid phase provides the liquid phase with solutes which constitute the Y-series 123 metal oxide so that the solutes are transported to the position at which the seed material and the liquid phase contact, thereby permitting the Y-series 123 metal oxide to grow on the seed material as primary crystals and to obtain the bulky substrate. The layer of a Y-series 123 metal oxide may be formed on the substrate by a sputtering method, a vacuum deposition method, a laser abrasion method, a CVD method or a liquid phase epitaxy method.

Composite material and method of preparing same

A method of pulling a crystal of a metal oxide is disclosed, in which the growth of the crystal is performed in a liquid phase having a composition which is different from the metal oxide and which contains components constituting the metal oxide. The liquid phase is in contact with a solid phase located at a position separated from the position at which the crystal of the metal oxide grows. The solid phase has a composition different from that of the metal oxide and supplies components constituting the metal oxide to the liquid phase.

Growing community of inventors

Funabashi, Japan

Minoru Tagami