Process for preparing mercury-barium-calcium-copper-oxide-based superconductor materials

Patent 5858926 Issued on January 12, 1999. Estimated Expiration Date:

August 23, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Mercury-thallium-barium-calcium-strontium-copper-oxide 1223 superconductor and method of making same Patent #: 5492885
Issued on: 02/20/1996
Inventor: Hur, et al.

Inventors

Assignee

Florida State University

Application

No. 702733 filed on 08/23/1996

US Classes:

505/120, Thallium (Tl) containing505/123, Halogen [i.e., fluorine (Fl), chlorine (Cl), bromine (Br), iodine (I), astatine (At)] containing505/125, Copper (Cu) and oxygen (O) containing505/126, Containing three atoms of copper to between six and seven atoms of oxygen [e.g., YCu3O(7-@), LaCu3O(6+*), etc.]505/501, Bismuth (Bi) or thallium (Tl) containing505/742, Annealing505/783, Thallium(Tl)-(e.g., Tl2CaBaCu308)505/785Composition containing superconducting material and diverse nonsuperconducting material

Examiners

Primary: King, Roy V.

Attorney, Agent or Firm

Senniger, Powers, Leavitt & Roedel

International Class

H01L 039/24

Abstract

The present invention is directed to a process for preparing a HgBaCaCuO superconductor by annealing a precursor mixture comprising a lower member of the homologous HgBaCaCuO superconductor series, a source of calcium and a source of copper. The precursor mixture may further comprise a source of oxygen, a source of rhenium, and, if desired, a source of an additional element selected from the group consisting of halogens and metals other than mercury, barium, calcium, copper and rhenium. The process is particularly effective for preparing (Hg1-x,Rex)Ba2 Ca2 Cu3 O8-y by annealing a precursor mixture containing (Hg1-x,Rex)Ba2 Ca1 Cu2 O6-y at a temperature below about 850° C., wherein x ranges up to about 0.25 and y is a rational number ranging from about negative 1 to about positive 1.

Other References

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