Bulk oxide superconductor and method of production of bulk oxide superconductor

Patent metadata

Field	Value
Publication number	US-2016351779-A1
Application number	US-201515113879-A
Country	US
Kind code	A1
Filing date	Mar 24, 2015
Priority date	Mar 24, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

The present invention has as its problem the provision of a bulk oxide superconductor which has a high workability and high critical current density characteristic regardless of the external conditions and solves the problem by limiting the amount of addition of Ag to 5 mass % or less, using the QMG method to produce a bulk superconductor and thereby obtain a single crystal-like bulk superconductor of a structure with parts where Ag particles are present and parts where Ag particles are not present made to adjoin each other.

First claim

1 . An bulk oxide superconductor comprised of a single crystal-like REBa 2 Cu 3 O 7-x phase in which RE 2 BaCuO 5 phases and Ag particles are contained, which bulk oxide superconductor characterized by being of a structure comprising parts where Ag particles are present and parts where Ag particles are not present adjoining each other and having Ag particles of a particle size of 10 μm or less dispersed in it.

2 . The bulk oxide superconductor according to claim 1 being of a structure where said parts where Ag particles are present sandwich said parts where Ag particles are not present.

3 . The bulk oxide superconductor according to claim 1 being of a structure where said parts where Ag particles are present surround said parts where Ag particles are not present.

4 . The bulk oxide superconductor according to claim 1 wherein said Ag particles have a particle size of 1 to 10 μm.

5 . The bulk oxide superconductor according to claim 1 wherein said bulk oxide superconductor is bar shaped, said parts where Ag particles are present are arranged at the two end parts, and the region other than said end parts is made a part where Ag particles are not present.

6 . A method of production of the bulk oxide superconductor comprising heating a precursor of a bulk oxide superconductor to form a semimolten state and bringing a seed crystal into contact with it to obtain a single crystal-like REBa 2 Cu 3 O 7-x phase in which RE 2 BaCuO 5 phases are finely dispersed, said method of production of the bulk oxide superconductor adding Ag: 0.5 to 5.0 mass % to said precursor of a bulk oxide superconductor and heating it to become a semimolten state, then bringing a seed crystal into contact with said semimolten state precursor and gradually cooling to make said precursor solidify into a single crystal shape.

7 . The method of production of the bulk oxide superconductor according to claim 6 further comprising working said bulk oxide superconductor into a bar shape so that parts where Ag is present sandwich a part where Ag is not present.

8 . The bulk oxide superconductor according to claim 2 wherein said Ag particles have a particle size of 1 to 10 μm.

9 . The bulk oxide superconductor according to claim 3 wherein said Ag particles have a particle size of 1 to 10 μm.

10 . The bulk oxide superconductor according to claim 2 wherein said bulk oxide superconductor is bar shaped, said parts where Ag particles are present are arranged at the two end parts, and the region other than said end parts is made a part where Ag particles are not present.

11 . The bulk oxide superconductor according to claim 3 wherein said bulk oxide superconductor is bar shaped, said parts where Ag particles are present are arranged at the two end parts, and the region other than said end parts is made a part where Ag particles are not present.

12 . The bulk oxide superconductor according to claim 4 wherein said bulk oxide superconductor is bar shaped, said parts where Ag particles are present are arranged at the two end parts, and the region other than said end parts is made a part where Ag particles are not present.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Morita Mitsuru

Classifications

• C30B29/225

  based on rare earth copper oxides, e.g. high T-superconductors · CPC title

• C04B35/653

  Processes involving a melting step · CPC title

• C04B2235/3225

  Yttrium oxide or oxide-forming salts thereof · CPC title

• C04B2235/408

  Noble metals · CPC title

• C01G5/006

  Compounds containing silver, with or without oxygen or hydrogen, and containing two or more other elements · CPC title