Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1988-10-03
1992-12-22
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252518, 252521, 423604, 423617, 423635, 505742, 505782, C01B 1318, C01F 1104, C01G 302, C01G 2900
Patent
active
051734761
ABSTRACT:
A superconductor consisting of a sufficiently pure phase of the oxides of Bi, Sr, Ca, and Cu to exhibit a resistive zero near 110K resulting from the process of forming a mixture of Bi.sub.2 O.sub.3, SrCO.sub.3, CaCO.sub.3 and CuO into aparticulate compact wherein the atom ratios are Bi.sub.2, Sr.sub.1.2-2.2, Ca.sub.1.8-2.4, Cu.sub.3. Thereafter, heating the particulate compact rapidly in the presence of oxygen to an elevated temperature near the melting point of the oxides to form a sintered compact, and then maintaining the sintered compact at the elevated temperature for a prolonged period of time. The sintered compact is cooled and reground. Thereafter, the reground particulate material is compacted and heated in the presence of oxygen to an elevated temperature near the melting point of the oxide and maintained at the elevated temperature for a time sufficient to provide a sufficiently pure phase to exhibit a resistive zero near 110K.
REFERENCES:
Maeda, H. et al., Jpn. J. Appl. Phys., 27, L209-L210 Feb. 26, 1988.
Matsui, Y. et al., Jpn. J. Appl. Phys., 27, L361-L364, Mar., 1988.
Mizuno, M. et al., Jpn. J. Appl. Phys., 27, L1225-L1227, Jul., 1988.
Takano, M. et al., Jpn. J. Appl. Phys., 27, L1041-L1043, Jun., 1988.
Zandbergen, H. W. et al., Nature, 332, pp. 620-623, Apr. 14, 1988.
Downey John W.
Lam Daniel J.
Paulikas Arvydas P.
Veal Boyd W.
Anderson Thomas G.
Boyd John
Lieberman Paul
Moser William R.
The United States of America as represented by the United States
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