Superconductor technology: apparatus – material – process – High temperature – per se – Copper containing
505779, 252521, C04B 3545, H01B 1200
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.
patent: 5534490 (1996-07-01), Itoh et al.
Radaelli et al., "Synthesis and Properties of a Cuprate Superconductor Containing Double Mercury-Oxygen Layers", Science, vol. 265, Jul. 15, 1994, pp. 380-383.
Gupta et al., "Mercury-Based Cuprate High-Transition Temperature Grain-Boundary Junctions and SQUIDs Operating Above 110 Kelvin", Science, vol. 265, Aug. 19, 1994, pp. 1075-1077.
Hirabayashi et al., "High-pressure synthesis of single-phase `1223` mercury-based superconductors", PHYSICA C, 219(1-2), 1994.
S. N. Putilin et al. Mat. Res. Bull. vol. 26, pp. 1299-1307, 1991.
S. N. Pulilin et al., Nature vol. 362, 18 Mar. 1993, pp. 226-228.
A. Schilling et al, Nature vol. 363, 6 May 1993, pp. 56-58.
Makoto Itoh et al., Physica C, 13 May 1993, pp. 271-273.
Seiji Adachi et al., Physica C, 23 Jun. 1993, pp. 313-315.
International Superconductivity Technology Center
Matsushita Electric - Industrial Co., Ltd.
McGinty Douglas J.
Sumitomo Electric Industries Ltd.
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