Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1988-07-08
1992-02-18
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252521, 423604, 423635, 501123, 501152, 505780, C01F 1102, C01F 1700, C01G 302, H01L 3902
Patent
active
050894668
ABSTRACT:
Stable mixed metal oxide compositions containing nitrogen are formed by treating an oxygen-deficient perovskite composition with nitrogen dioxide. Preferably, the oxygen-deficient perovskite is of the formula X.sub.a Z.sub.b Cu.sub.c O.sub.h wherein X is a member selected from the group consisting of yttrium, scandium, lanthanum, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, bismuth and thallium, Z is a member selected from the group consisting of barium, strontium, calcium, magnesium and mixtures thereof, a is not less than 1, b is from 0 to 3, c is from 0 to 3, and h is not greater than about 6, and the mixed metal oxides are of the formula X.sub.a Z.sub.b Cu.sub.c N.sub.j O.sub.k where X, Z, a, b and c are as previously defined, j is from about 0.001 to about 3, and k is from about 6 to about 13.
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Montzka Stephen A.
Sievers Robert E.
Boyd John
Lieberman Paul
The University of Colorado Foundation Inc.
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