(Hg Cu)Bg.sub.2 Ca.sub.2 Cu.sub.3 Oy oxide superconductor and me

Superconductor technology: apparatus – material – process – High temperature – per se – Copper containing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

505779, 252521, C04B 3545, H01B 1200

Patent

active

055997759

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:
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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

(Hg Cu)Bg.sub.2 Ca.sub.2 Cu.sub.3 Oy oxide superconductor and me does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with (Hg Cu)Bg.sub.2 Ca.sub.2 Cu.sub.3 Oy oxide superconductor and me, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and (Hg Cu)Bg.sub.2 Ca.sub.2 Cu.sub.3 Oy oxide superconductor and me will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-678485

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.