Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Shaping or consolidating
Patent
1994-07-07
1995-08-08
King, Roy V.
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Shaping or consolidating
505490, 505300, 505125, 505785, 505810, 505815, 252518, 252521, 423593, 423635, H01B 106, H01B 108
Patent
active
054398789
ABSTRACT:
A process for preparing a copper oxide superconductor of (Ba,Sr)-Cu-C-O containing carbonate radicals is disclosed, which comprises the steps of: mixing alkaline earth metal compounds and a copper compound with a molar ratio of 1.1 to 2.25 to obtain a mixture; pressing said mixture to form a pellet; and sintering said pellet in an oxygen atmosphere, wherein the alkaline earth metal compounds including a barium compound selected from the group consisting of barium carbonate and barium oxalate, and a strontium compound selected from the group consisting of strontium carbonate and strontium oxalate and the copper compound selected from the group consisting of copper carbonate, copper nitrate, copper oxalate and copper oxide.
REFERENCES:
Izumi et al, "The crystal structure of the superconducting copper oxide carbonate (Ba.sub.1-x Sr.sub.x).sub.2 Cu.sub.1+y O.sub.2+2y+z (CO.sub.3).sub.1-y ", Physica C 196 (1992) pp. 227-235.
K. Osamura et al, "Crystal Structure of Ternary Ba.sub.8 YCu.sub.4 O.sub.16 -d Phase", Japanese Journal of Applied Physics, vol. 26, No. 12, Dec. 1987, pp. L2094-L2096.
T. G. Narendra Babu et al, "Synthesis, Structure and Electrical Properties of Sr.sub.2 CuO.sub.2 (CO.sub.3), an Oxide Carbonate related to Perovskite", J. Mater. Chem., 1991, (14), pp. 677-679.
Hirai et al., Nikkei Chyodendo, Feb. 3, 1992, pp. 6-7.
Chaillout et al, "Synthesis and crystal structure of BaSrCuO.sub.2+x CO.sub.3 " Physica C 195 pp. 335-344.
Armstrong et al, "Synthesis and structure of Sr.sub.1.5 Ba.sub.0.5 CuO.sub.2 (CO.sub.3): An oxycarbonate containing infinite CuO.sub.2 layers", Journal of Solid State Chemistry 98(2), Jun. 1992 pp. 432-436.
Kinoshita et al, "A new copper oxide superconductor containing carbon", Nature, vol. 357, May 1992, pp. 313-315.
Kinoshita Kyoichi
Yamada Tomoaki
King Roy V.
Nippon Telegraph and Telephone Corporation
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