Ti-Ca-Ba-Cu-D compositions electrically superconducting above 12

Details Ti-Ca-Ba-Cu-D compositions electrically superconducting above 12 Ti-Ca-Ba-Cu-D compositions electrically superconducting above 12

1989-03-22

1991-01-29

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252521, 423604, 423624, 423635, 501123, 502346, 505783, C01F 1102, C01G 302, C01G 1500

Patent

active

049886681

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 Ti.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:
Robinson, "Effect of Oxidizing Atmosphere on Superconductivity in Rba.sub.2 Cu.sub.3-x M.sub.x O.sub.x " Mat. Res. Soc. Sump. Proc. vol. 99, Nov./Dec. 1987, pp. 587-590.
Ovshinsky "Superconductivity at 155 K" to Phys. Rev. Lett. vol. 58, No. 24 Jun. 15, 1987, pp. 2579-2581.
Karpinski "High Purity Autoclaves (2.5 Kbar) for High Temp. Crystal . . . " Incl. of Crystal Growth 79, 1986, pp. 477-483.
Ihara "Possibility of Superconductivity at 65.degree. C. in Sr-Ba-Y-Cu--O . . . " Jap. Jnl of Applied Physics, vol. 26, No. 8, Aug. 1987, pp. L1413-L1415.
Hazen "100-K Superconducting Phases in the Ti-Ca-Ba-Cu-O System" Phys. Rev. Lett. vol. 60, No. 16, Apr. 18, 1988, pp. 1657-1660.
Weast CRC Handbook of Chemistry and Physics 1983, pp. B-41-42.
Hackh Hackh's Chemical Dictionary 1938, pp. 929-930.

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