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US5646094A Expired / Lapsed US ⏱️ 0.0 years remaining

Rare earth substituted thallium-based superconductors

Assignee: Callaghan Innovation Research Ltd
•
Filing: 1995-04-13
•
Granted: 1997-07-08
•
Expires: 2015-04-13
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Abstract

Abstract The present invention comprises novel superconducting materials exhibiting superconductivity at temperatures exceeding 90 K. with chemical formula TlaPbbCacSrdReCufOg where R=Y or the lanthanide rare earth elements and where 0.3</=a,b</=0.7, 0.05</=c</=1.1,2-c</=d</=1.95, 0.05</=e</=1, 1.9</=f</=2.1 and 6.5</=g</=7.5. These compounds, which are layered perovskite-like oxides, exhibit a high chemical stability, form readily into nearly single phase, do not require adjustment of oxygen stoichiometry after synthesis and compositions may be chosen allowing superconductivity at temperatures exceeding 100 K. A preferred form of the superconducting materials is the range of compositions given by the chemical formulaTl0.5+xPb0.5-xCa1-ySr2-zRy+zCu2O7+/- delta where 0</=x, 8</=0.3, 0</=y</=0.95, 0.05</=z</=1-y of which a preferred form isTl0.5+xPb0.5-xCa0.8+x+zSr2-zR0.2-xCu2O7+/- delta exemplified by Tl0.5Pb0.5CaSr1.8La0-2Cu2O7+/- delta where 0</= delta </=0.1.

Inventors

  • 👤 Jeffrey Lewis Tallon
  • 👤 Murray Robert Presland

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 23:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4512; C04B35/4517; H; H10; H10N; H10N60/00; H10N60/80; H10N60/85; H10N60/855; H10N60/857; Y; Y10; Y10S; Y10S505/00; Y10S505/775; Y10S505/776; Y10S505/783

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 21 words
A material which exhibits high temperature superconductivity at above 101 K., of formula Tl.sub.0.5 Pb.sub.0.5 CaSr.sub.2-z La.sub.z Cu.sub.2 O.sub.7 wherein 0.15≦z≦0.3.
Claim 2
Dependent Claim 21 words
A material which exhibits high temperature superconductivity at above 101 K., of formula Tl.sub.0.5 Pb.sub.0.5 CaSr.sub.2-z La.sub.z Cu.sub.2 O.sub.7 wherein 0.15≦z≦0.3.
Claim 3
Dependent Claim 15 words
A material according to claim 1 and of formula Tl.sub.0.5 Pb.sub.0.5 CaSr.sub.1.8 La.sub.0.2 Cu.sub.2 O.sub.7.

References Cited (Backward Citations)

US5093312A Cited
US4894361A Cited
US5036044A Cited
JPH02116619A Cited
EP0368210A2 Cited
US5462922A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2000-07-07 2001-01-06 2001-07-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2004-07-07 2005-01-06 2005-07-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2008-07-07 2009-01-06 2009-07-08 $7700.00 Window Closed / Lapsed

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