High temperature T1-Ba-Ca-Cu-O and T1-Sr-Cu-O superconductor
AssigneeUniversity of Arkansas
InventorsAllen M. Hermann, Zhengzhi Sheng
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Abstract
A new high temperature superconductor with transition temperature above 120 K is disclosed. The superconductor in a preferred embodiment comprises T1RBaCuO wherein R is chosen from Group 2A elements excluding Ba. In another preferred embodiment, the superconductor comprises T1SrCuO. Processes for making high temperature superconductors are also disclosed.
Claims8
A composition having superconductor properties that has the following approximate stoichiometry:
- TlCa.sub.y Ba.sub.z Cu.sub.u O.sub.v
- wherein:
- y+z is greater than or equal to 0.2 and less than or equal to 5;
- z is greater than 0 and less than 5;
- y is greater than 0 and less than 5;
- u is greater than or equal to 0.5 and less than or equal to 15;
- and
- v is greater than or equal to z+y+u and less than or equal to 2+z+y+u.
A composition having superconductor properties that has the following approximate stoichiometry:
- TlSr.sub.y Ba.sub.z Cu.sub.u O.sub.v
- wherein:
- y+z is greater than or equal to 0.2 and less than or equal to 5;
- z is greater than 0 and less than 5;
- y is greater than 0 and less than 5;
- u is greater than or equal to 0.5 and less than or equal to 15;
- and
- v is greater than or equal to z+y+u and less than or equal to 2+z+y+u.
A composition having superconductive properties that has the following approximate stoichiometry:
- TlSr.sub.y Cu.sub.u O.sub.v
- wherein:
- y is greater than 0.2 and less than or equal to 5;
- u is greater than or equal to 0.5 and less than or equal to 15;
- and
- v is greater than or equal to y+u and less than or equal to 2+y+u.
A high temperature superconductor comprising a melt produced complex having the nominal composition:
- Tl.sub.1.86 CaBaCu.sub.3 O.sub.7.8+X.
A high temperature superconductor comprising a melt produced complex having the nominal composition:
- Tl.sub.2 Ca.sub.1.5 BaCu.sub.3 O.sub.8.5+X.
A high temperature superconductor comprising a melt produced complex having the nominal composition:
- Tl.sub.1.5 Ca.sub.0.5 BaCu.sub.3 O.sub.6.8+X.
A high temperature superconductor comprising a melt produced complex having the nominal composition:
- Tl.sub.2 Sr.sub.0.45 Cu.sub.3 O.sub.6.5+X.
A high temperature superconductor comprising a melt produced complex having the nominal composition:
- Tl.sub.2 SrBaCu.sub.3 O.sub.8+X.
Dependencies are inferred from the claim text.