Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1992-07-02
1994-03-15
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252500, 252518, 423414, 423DIG39, 505775, 505800, C01B 3100, H01L 3912
Patent
active
052946002
ABSTRACT:
A superconducting material higher in superconducting transition temperature and superconducting volume ratio than any conventional one is provided, which comprises a fullerene doped with rubidium and cesium. This fullerene system superconducting material makes it possible to improve both the superconducting transition temperature and superconducting volume ratio by having rubidium and cesium doped thereinto compared with any conventional fullerene systems. If the chemical composition of this super conducting material is expressed as Rb.sub.x Cs.sub.y C.sub.n, x and y are arbitrary if an equation x+y=3 is satisfied, preferable to be x=2 and y=1, further preferable to be x=1 and y=s. The superconducting transition temperature Tc and superconducting volume ratio when x=1 and y=2 or x=2 and y=1 are superior to those when x=3 and y=0 or x=0 and y=3, respectively.
REFERENCES:
patent: 5223479 (1993-06-01), McCauley
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Holczer et al., "Alkali-Fulleride Superconductors: Synthesis, Composition, and Diamagnetic Shielding", Science, vol. 252, pp. 1154-1157, May 24, 1991.
Chen et al., "(Rb.sub.x K.sub.1-x).sub.3 C.sub.60 Superconductors: Formation of a Continuous Series of Solid Solutions", Science, vol. 253, Aug. 23, 1991, pp. 886-888.
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Ebbesen Thomas
Kuroshima Sadanori
Mizuki Junichiro
Tanigaki Katsumi
Boyd John
Lieberman Paul
NEC Corporation
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