Metal treatment – Stock – Magnesium base
Reexamination Certificate
2002-03-08
2008-11-04
Ip, Sikyin (Department: 1793)
Metal treatment
Stock
Magnesium base
C148S442000, C420S402000, C420S580000, C420S901000, C505S100000, C505S785000, C505S805000
Reexamination Certificate
active
07445681
ABSTRACT:
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 beryllium (Be) and has a chemical composition expressed by formula: Mg1Be2, has a hexagonal AlB2type crystallographic structure and has a superconducting transition temperature (Tc) of 35 K. An alloy containing this intermetallic compound excels in malleability and ductility and constitutes the alloy superconductor having a superconducting transition temperature (Tc) of 35 K and being low in specific resistance for normal conduction at a temperature ranging from the superconducting transition temperature to a room temperature. In the method of manufacture, a Mg containing feedstock powder and a Be containing feedstock powder are mixed together to form a mixture thereof which is, e.g., hot pressed to produce a semiconductor product.
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I. Felner; “Absence of Superconductivity in BeB2”; Racah Institute of Physics; Feb. 28, 2001. Cited in the int'l. search report.
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Akimitsu Jun
Kadomura Kazunobu
Muranaka Takahiro
Zenitani Yuji
Ip Sikyin
Japan Science and Technology Agency
Western, Hattori, Daniels & Adrian, LLP.
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