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Abstract

The present invention is directed to a process for preparing a HgBaCaCuO superconductor by annealing a precursor mixture comprising a lower member of the homologous HgBaCaCuO superconductor series, a source of calcium and a source of copper. The precursor mixture may further comprise a source of oxygen, a source of rhenium, and, if desired, a source of an additional element selected from the group consisting of halogens and metals other than mercury, barium, calcium, copper and rhenium. The process is particularly effective for preparing (Hg1-x,Rex)Ba2 Ca2 Cu3 O8-y by annealing a precursor mixture containing (Hg1-x,Rex)Ba2 Ca1 Cu2 O6-y at a temperature below about 850° C., wherein x ranges up to about 0.25 and y is a rational number ranging from about negative 1 to about positive 1.

Other References

• Wolters et al, Physica 267, No. 1-2, pp. 164-172 Aug. 10, 1996
• Yamasaki et al, Crit. Curr. Supercond., Proc.Int. Workshop, 8th, 243-246. (1996)
• Kishio et al, J. low Temp. Phys., 105(5/6), pp. 1359-1365 (1996)
• E.V. Antipov, et al. "The Synthesis And Characterization Of The HgBa₂ Ca₂ Cu₃ O_8+δ and HgBa₂ Ca₂ Cu₄ O_10+δ Phases", Physica C 215 (1993) pp. 1-10
• Ronald H. Arendt, et al. "An Alternate Preparation For (Bi, Pb)₂ Ca₂ Sr₂ Cu₃ O_z " Physica C 176 (1991) pp. 126-130
• O. Chmaissem, et al. "Synthesis and Characterization of HgBa₂ Ca_n-1 Cu_n O_2n+2+δ (n=1, 2, and 3)" Physica C 230 (1994) pp. 231-238
• C.W. Chu, "Superconductivity at Higher Temperatures In the Hg-Ba-Ca-Cu-O Compound System" Journal of Superconductivity, vol. 7, No. 1, 1994, pp. 1, 5-7
• Z.H. He, et al. "High-Pressure Synthesis Of Single-Phase Superconductors Hg_z Sr_x Ba_2-x Ca₂ Cu₃)_8+δ and (Hg,M)Sr₂ Ca₂ Cu₃ O_y With M=Pb And Mo", Physica C 241 (1995) pp. 211-218
• H. Ihara "Beyond A Half Way To Room Temperature Superconductors -- ABa₂ Ca_n-1 Cu_n O_2n+3-y (A=Tl, Hg, Ag, --)--" Bulletin of The Electrotechnical Laboratory, vol. 58, No. 6 (1994) pp. 63-68
• R.T. Kampwirth, et al. "Properties of T1-1223 Superconducting Thick Films Fabricated From Precursor Inks Using A Thallium Vapor Transport Process", 1994 no page number
• L. Krusin-Elbaum, et al. "High Current Densities Above 100 K In The High-Temperature Superconductor HgBa₂ CaCu₂ O_6+δ ", Nature, vol. 373, Feb. 23, 1995, pp. 679-681
• R.S. Liu, et al. "A New 92 K High-T_c Superconductor Hg-Containing T1-based 1212 Phase" Physica C 205 (1993), pp. 206-211
• A. Maignan, et al. "The Great Ability Of Mercury-based Cuprates To Accommodate Transition Elements" Physica C 243 (1995) pp. 233-242
• R.L. Meng, et al. "Superconductivity at 112-117 K in HgBa₂ CaCu₂ O_6+δ " Physica C 214 (1993) pp. 307-312
• M.S. Osofsky, et al. "Superconductivity Above 100 K in Compounds Containing Hg" Journal of Superconductivity, vol. 8, No. 4, 1995, pp. 511-514
• Graeme B. Peacock, et al. "Effective Synthesis of HgBa₂ Ca₂ Cu₃ O_8+δ : The Highest T_c Superconductor" Adv. Mater, 1995, vol. 7, No. 11, pp. 925-927
• S.N. Putilin, et al. "Superconductivity Above 120 K in HgBa₂ CaCu₂ O_6+δ " Physica C 212 (1993) pp. 266-270
• S. Reich, et al. "Variation Of The Superconducting Properties of Hg_x Ba₂ Ca₂ Cu₃ O_8+δ As A Function Of the Mercury Content" Physica C 231 (1994) pp. 1-3
• J. Schwartz "HgBaCaCuO Superconductors: Processing, Properties And Potential" Physica B 216 (1995) p. 261
• Ch. Wolters, et al. "Bulk Processing of HgBaCaCuO Superconductors By A Two-Zone Technique" IEEE Transactions on Applied Superconductivity, vol. 5, No. 2 (1995) no page number
• Ch. Wolters, et al. "Preparation Of HgBaCaCuO Polycrystals And Silver Sheathed Tapes By A Two-Zone Technique" ICMCI Conference, 1995 no page numbe