Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-04-03
1991-03-26
Roy, Upendra
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252521, 420901, 428930, 505 1, 1775, 1725, C23C 1600, B05D 512
Patent
active
050029274
ABSTRACT:
Ceramic superconductor materials, e.g., of rare earth/alkaline earth metal/transition metal/oxygen type, contain an effective stabilizing amount of fluorine atoms distributed therein in a concentration gradient decreasing from the external face surface of the material to the core region thereof; advantageously the fluorine atoms are principally distributed in an external protective diffusion barrier layer.
REFERENCES:
patent: 4916114 (1990-04-01), Hoenig
Perrin et al., Supercond. Sci. Technol. 2, (1989), 35.
Ovshinsky et al., Phys. Rev. Letts. 58, (1987), 2579.
Davies et al., Solid State Comm. 64, (Dec. 1987), 1441.
Bansal et al., Appl. Phys. Letts., 52, (Mar. 1988), 838.
Young et al., Mrs-Symp. #99, eds. Brodsky et al., Nov. 1987, p. 549.
Tesmer et al., Mrs-Symp. #99, eds. Brodsky et al., Nov. 87, p. 643.
Chaussy Jacques
Chevallier Bernard
Dance Jean-Michel
Etourneau Jean
Lejay Pascal
Rhone-Poulenc Chimie
Roy Upendra
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