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Intermetallic compound superconductors and alloy superconductors, and methods of making them achieved

Foreign code F110003136
File No. A061-16US2
Posted date Jun 15, 2011
Country United States of America
Application number 20233505
Gazette No. 20060079402
Gazette No. 7172993
Date of filing Aug 12, 2005
Gazette Date Apr 13, 2006
Gazette Date Feb 6, 2007
International application number JP2001006383
International publication number WO2002055435
Date of international filing Jul 24, 2001
Date of international publication Jul 18, 2002
Priority data
  • P2001-001948 (Jan 9, 2001) JP
  • 2001WO-JP06383 (Jul 24, 2001) WO
  • 2002US-10220272 (Sep 9, 2002) US
Title Intermetallic compound superconductors and alloy superconductors, and methods of making them achieved
Abstract (US7172993)
There are provided an intermetallic compound superconductor that is high in superconducting transition temperature, and an alloy superconductor that is high in superconducting transition temperature and excels in malleability and ductility, as well as a method of making such a superconductor with good reproducibility and at a low cost of manufacture.
This entirely new intermetallic compound superconductor is made of magnesium (Mg) and boron (B) and has a chemical composition expressed by formula: Mg1B2, has a hexagonal AlB2 type crystallographic structure and has a superconducting transition temperature (Tc) of 39 K.
An alloy containing this intermetallic compound excels in malleability and ductility and constitutes the alloy superconductor having a superconducting transition temperature (Tc) of 39 K.
In the method of manufacture, a Mg containing feedstock powder and a B containing feedstock powder are mixed together to form a mixture thereof which is, e.g., hot pressed to produce a semiconductor product.
Scope of claims [claim1]
1. A method of conducting electrical current, comprising the steps of: providing an alloy superconductor, characterized in that it contains an intermetallic compound made of Mg and B, and one or more metallic elements,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim2]
2. A method of conducting electrical current as set forth in claim 1, characterized in that said alloy superconductor contains said intermetallic compound and is of a composition expressed by chemical composition formula: Mg1-xB2+y where 0<x<1, -2<y<0 and 0<y<2.
[claim3]
3. A method of conducting electrical current as set forth in claim 1, characterized in that said alloy superconductor has a superconducting transition temperature (Tc) of 39 K.
[claim4]
4. A method of conducting electrical current, comprising the steps of: mixing a Mg containing feedstock powder and a B containing feedstock powder together to form a mixture powder thereof so that the mixture powder contains Mg and B at a compositional ratio of Mg/B=(1-x)/(2+y) where 0<x<1, -2<y<0 and 0<y<2,shaping said mixture powder into the form of a pellet,heating said pellet in an inert gas to form an alloy superconductor,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim5]
5. A method of conducting electrical current as set forth in claim 4, characterized in that said pellet is heated in said inert gas at a temperature of 700 to 2000 deg. C. for a period of several seconds or more.
[claim6]
6. A method of conducting electrical current, comprising the steps of: mixing a Mg containing feedstock powder and a B containing feedstock powder together to form a mixture powder thereof so that the mixture powder contains Mg and B at a compositional ratio of Mg/B=(1-x)/(2+y) where 0<x<1, -2<y<0 and 0<y<2,shaping said mixture powder into the form of a pellet,heating said pellet in a vacuum to form an alloy superconductor,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim7]
7. A method of conducting electrical current as set forth in claim 6, characterized in that said pellet is heated in the vacuum under a pressure of 2 * 10-2 Pa or less at a temperature of 650 to 1100 deg. C. for a period of several minutes or more.
[claim8]
8. A method of conducting electrical current, comprising the steps of: mixing a Mg containing feedstock powder and a B containing feedstock powder together to form a mixture powder thereof so that the mixture powder contains Mg and B at a compositional ratio of Mg/B=(1-x)/(2+y) where 0<x<1, -2<y<0 and 0<y<2,shaping said mixture powder into the form of a pellet,heating said pellet in a pressurized inert gas to form an alloy superconductor,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim9]
9. A method of conducting electrical current as set forth in claim 8, characterized in that said pellet is heated in said inert gas under a pressure of 1 to 200 MPa at a temperature of 600 to 1100 deg. C. for a period of several minutes or more.
[claim10]
10. A method of conducting electrical current, comprising the steps of: mixing a Mg containing feedstock powder and a B containing feedstock powder together to form a mixture powder thereof so that the mixture powder contains Mg and B at a compositional ratio of Mg/B=(1-x)/(2+y) where 0<x<1, -2<y<0 and 0<y<2,shaping said mixture powder into the form of pellet,pressing and heating said pellet to form an alloy superconductor,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim11]
11. A method of conducting electrical current as set forth in claim 10, characterized in that said pellet is pressed and heated under a pressure of 0.1 to 6 GPa at a temperature of 700 to 1400 deg. C. for a period of several minutes or more.
  • Inventor, and Inventor/Applicant
  • AKIMITSU JUN
  • ZENITANI YUJI
  • MURANAKA TAKAHIRO
  • NAKAGAWA NORIMASA
  • NAGAMATSU JUN
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) CREST Phenomena of Extreme Conditions AREA
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