Tl-Ca-Ba-Cu-O compositions electrically superconducting above 12

Details Tl-Ca-Ba-Cu-O compositions electrically superconducting above 12 Tl-Ca-Ba-Cu-O compositions electrically superconducting above 12

1988-03-08

1989-09-26

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252518, 252521, 423624, 501123, 502341, 502346, 502355, 502354, C01F 1100, C01G 302, H01L 3912, C22C 2400

Patent

active

048700525

ABSTRACT:
Stable, bulk electrical superconductors are prepared by heating mixed metal oxides in the presence of oxygen in a closed vessel in a preheated oven for 1-5 hours at 850.degree.-900.degree. C. The final oxides are in the molar ratio Tol.sub.0.6-1.1 Ca.sub.2-3 Ba.sub.0.75-1.25 Cu.sub.2-3 O.sub.(5+.delta.)-(9+.delta.), where .delta. is less than one.

REFERENCES:
Parkin et al., "Magnetic Field Dependence of . . . Bi-Sr-Ca-Cu Super.", Preprint: (subsequent publication date unknown).
Tarascon, "Crystal Substructure and Physical Properties . . . ", preprint: (subsequent publication date unknown).
Sunshine et al., "Structure and Physical Properties of Single . . . ", preprint: (subsequent publication date unknown).
Veblen, "Crystallography, Chemistry . . . in New High-Tc Bi-Ca-Sr-Cu-O Super", preprint: (subsequent publication date unknown).
Hazen et al., "Super Conductivity in the Very High To Bi-Ca-Sr-Cu-O", preprint: (subsequent publication date unknown).
R. M. Hazen et al., "100K Supercond. Phases in the Ti-Ca-Ba-Cu-O System", Phys. Rev. Lett., vol. 60, No. 16, 4/18/88, p. 1657.
J. B. Torrance et al., "New Class of High Tc Structures; . . . ", preprint: (publication date unknown).
Engler, "Superconductivity at Accessible Temperatures", Chemtech, 1987, 17, pp. 542-551, Sep. 1987.
Maeda et al., "A New High to Oxide Super. without R.E.", (subsequent publication unknown),: preprint.

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