HIP method of making high temperature mercury-containing superconductors
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsLouis E. Toth, William Lechter, Earl F. Skelton, Michael Osofsky
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Abstract
Hg,Tl-based superconductors are produced by HIPping. A new superconducting phase, having a double (Hg,Tl)-layer and the nominal composition: (Hg.sub.1-x Tl.sub.x).sub.2 (Ba.sub.1-a Sr.sub.a).sub.2 (Ca.sub.1-b Y.sub.b).sub.2 Cu.sub.3 O.sub.z where 0.ltoreq.x.ltoreq.0.95, 0.ltoreq.a.ltoreq.1, 0.ltoreq.b.ltoreq.1, and z is sufficient to provide said phase with a resistive and magnetic superconducting transition of 100 K or above, can be produced. Either precursor oxides, or partially or fully reacted mixed oxides, can be used in the HIPping mixture.
Claims8
A method of forming an essentially single phase bulk superconducting material, comprising the steps of:
- hot isostatically pressing a starting material comprising a mixed (Hg,Tl)--(Ba,Sr)--(Ca,Y)--Cu oxide;
- a mixture of (Hg,Tl) oxide, (Ba,Sr) oxide, (Ca,Y) oxide and Cu oxide;
- or a mixture of (Hg,Tl) oxide with a mixed (Ba,Sr)--(Ca,Y)--Cu oxide so as to form a consolidated superconducting bulk material having a magnetic superconducting transition and R=0 at a temperature of 100 K or above, said bulk material being a phase having the nominal composition:
- (Hg.sub.1-x Tl.sub.x).sub.u (Ba.sub.1-a Sr.sub.a).sub.2 (Ca.sub.1-b Y.sub.b).sub.y Cu.sub.w O.sub.z
- where 0.ltoreq.x.ltoreq.0.9, 0.ltoreq.a.ltoreq.1, 0.ltoreq.b.ltoreq.1, u is 1 or 2, y is 1 or 2, w is 2 or 3, and z is sufficient to provide said phase with a resistive and magnetic superconducting transisition of 100 K or above.
Dependencies are inferred from the claim text.