(Hg,Cu)Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.y oxide superconductor a

Details (Hg,Cu)Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.y oxide superconductor a (Hg,Cu)Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.y oxide superconductor a

1994-06-23

1996-07-09

Lieberman, Paul

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

Shaping or consolidating

505725, 505779, 505742, 505500, 505739, 505125, 252518, 252521, C04B 3545, C04B 3550, H01B 1200

Patent

active

055344909

ABSTRACT:
Provided is an Hg-Ba-Ca-Cu-O oxide superconductor having a high superconductivity transition temperature Tc and a method which can prepare the same in excellent reproducibility. This oxide superconductor consists essentially of Hg, Ba, Ca, Cu and O, and is expressed in a chemical formula (Hg.sub.1-X Cu.sub.X)Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.Y, wherein X=0.05 to 0.7 and Y=8 to 8.75. A method of preparing the oxide superconductor comprises a step of mixing raw materials of Hg, Ba, Ca and Cu with each other so that (Hg+Ba):Ca:Cu=b:1:C and Hg:Ba=(1-a):a, wherein 0.625.ltoreq.a.ltoreq.0.714, 1.ltoreq.b.ltoreq.3 and 1.667.ltoreq.c.ltoreq.3.444, in mole ratio, and compression-molding the mixture, and a step of heat treating a compact obtained by the compression molding. This oxide superconductor has a superconductivity transition temperature Tc of 134 K., which is the highest at present.

REFERENCES:
Radaelli et al "Synthesis & Properties of a Cuprate Superconductor . . . " Science, vol. 265, 15 Jul. 1994, pp. 380-383.
Gupta et al "Mercury-Based Cuprate High-Transition Temperature Grain Boundary . . . " Science, vol. 265, 19 Aug. 1994, pp. 1075-1077.
Hirabayashi et al "High Pressure Synthesis of Single-phase 1223 Mercury-Based . . . " Physica C, 219 (1-2), 1994.

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