Intermetallic compound superconductors and alloy...

Superconductor technology: apparatus – material – process – High temperature – per se

Reexamination Certificate

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C505S805000, C420S402000, C420S901000

Reexamination Certificate

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06956011

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 boron (B) and has a chemical composition expressed by formula: Mg1B2, has a hexagonal AlB2type 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.

REFERENCES:
“The preparation of aluminum diboride, AIB2” Felten, Edward J. et al Journal of the American Chemical Society (1956), 78, 5977-78.
Preparation and structure of magnesium boride, MgB2 Jones, Morton E. et al Journal of the American Chemical Society (1954), 76, 1434-6 (Abstract Only).
Chretein et al “Magnesium boride: its thermal reactions”; Compt. Rend. (1962), 254, 1439-41. (Abstract only).
Naslain et al “Magnesium diborides and tetraborides”; Journal of Solid State Chem. (1973), 8(1), 68-85 (Abstract only).
Jun Nagamatsu et al.; Letters to Nature; vol. 410, pp. 63-64; Mar. 1, 2001. See PCT search report.
D. C. Larhalestler et al., Letters to Nature; vol. 410, pp. 186-189; Mar. 8, 2001. See PCT search report.
A. V. Tsvyashchenko et al.; vol. 119, No. 3, pp. 153-158, Jul. 17, 2001. See PCT search report.
Leyarovska, et al, Search for Superconductivity Below 1K in Transition Metal Borides; Journal of the Less-Common Metals, 67 (1979) p. 249-255.

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