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Title: Synthesis of BiPbSrCaCuO superconductor

Abstract

A process and a precursor composition for preparing a lead-doped bismuth-strontium-calcium-copper oxide superconductor of the formula Bi[sub a]Pb[sub b]Sr[sub c]Ca[sub d]Cu[sub e]O[sub f] wherein a is from about 1.7 to about 1.9, b is from about 0.3 to about 0.45, c is from about 1.6 to about 2.2, d is from about 1.6 to about 2.2, e is from about 2.97 to about 3.2 and f is 10[+-]z by reacting a mixture of Bi[sub 4]Sr[sub 3]Ca[sub 3]Cu[sub 4]O[sub 16[+-]z], an alkaline earth metal cuprate, e.g., Sr[sub 9]Ca[sub 5]Cu[sub 24]O[sub 41], and an alkaline earth metal plumbate, e.g., Ca[sub 2[minus]x]Sr[sub x]PbO[sub 4] wherein x is about 0.5, is disclosed.

Inventors:
; ; ; ;
Publication Date:
OSTI Identifier:
5078271
Patent Number(s):
US 5300486; A
Application Number:
PPN: US 8-067911
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-94-076446
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Resource Relation:
Patent File Date: 27 May 1993
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; BISMUTH OXIDES; SYNTHESIS; CALCIUM OXIDES; COPPER OXIDES; LEAD OXIDES; STRONTIUM OXIDES; CHEMICAL COMPOSITION; HIGH-TC SUPERCONDUCTORS; ALKALINE EARTH METAL COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; LEAD COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; 400201* - Chemical & Physicochemical Properties; 360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Hults, W.L., Kubat-Martin, K.A., Salazar, K.V., Phillips, D.S., and Peterson, D.E.. Synthesis of BiPbSrCaCuO superconductor. United States: N. p., 1994. Web.
Hults, W.L., Kubat-Martin, K.A., Salazar, K.V., Phillips, D.S., & Peterson, D.E.. Synthesis of BiPbSrCaCuO superconductor. United States.
Hults, W.L., Kubat-Martin, K.A., Salazar, K.V., Phillips, D.S., and Peterson, D.E.. 1994. "Synthesis of BiPbSrCaCuO superconductor". United States. doi:.
@article{osti_5078271,
title = {Synthesis of BiPbSrCaCuO superconductor},
author = {Hults, W.L. and Kubat-Martin, K.A. and Salazar, K.V. and Phillips, D.S. and Peterson, D.E.},
abstractNote = {A process and a precursor composition for preparing a lead-doped bismuth-strontium-calcium-copper oxide superconductor of the formula Bi[sub a]Pb[sub b]Sr[sub c]Ca[sub d]Cu[sub e]O[sub f] wherein a is from about 1.7 to about 1.9, b is from about 0.3 to about 0.45, c is from about 1.6 to about 2.2, d is from about 1.6 to about 2.2, e is from about 2.97 to about 3.2 and f is 10[+-]z by reacting a mixture of Bi[sub 4]Sr[sub 3]Ca[sub 3]Cu[sub 4]O[sub 16[+-]z], an alkaline earth metal cuprate, e.g., Sr[sub 9]Ca[sub 5]Cu[sub 24]O[sub 41], and an alkaline earth metal plumbate, e.g., Ca[sub 2[minus]x]Sr[sub x]PbO[sub 4] wherein x is about 0.5, is disclosed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1994,
month = 4
}
  • A process and a precursor composition for preparing a lead-doped bismuth-strontium-calcium-copper oxide superconductor of the formula Bi.sub.a Pb.sub.b Sr.sub.c Ca.sub.d Cu.sub.e O.sub.f wherein a is from about 1.7 to about 1.9, b is from about 0.3 to about 0.45, c is from about 1.6 to about 2.2, d is from about 1.6 to about 2.2, e is from about 2.97 to about 3.2 and f is 10.+-.z by reacting a mixture of Bi.sub.4 Sr.sub.3 Ca.sub.3 Cu.sub.4 O.sub.16.+-.z, an alkaline earth metal cuprate, e.g., Sr.sub.9 Ca.sub.5 Cu.sub.24 O.sub.41, and an alkaline earth metal plumbate, e.g., Ca.sub.2-x Sr.sub.x PbO.sub.4 wherein x ismore » about 0.5, is disclosed.« less
  • Two-powder processes for the synthesis of superconducting (Bi, Pb)-2223/Ag-clad wires by the oxide-powder-in-the-robe are provided. The first precursor powder, of nominal stoichiometry CaCuO{sub x}, is a solution-synthesized mixture of Ca{sub 0.45}Cu{sub 0.55}O{sub 2} and CaO. Using these oxide precursor mixtures, superconducting tapes with well-aligned grains and reproducible critical current densities J{sub c} in the range of 20,000 to 26,000 A/cm{sup 2} at 75 K in self-field after annealing less than 200 hours were obtained. 2 figs.
  • An article and method of manufacture of (Bi,Pb)-Sr-Ca-Cu-O superconductor. The superconductor is manufactured by preparing a first powdered mixture of bismuth oxide, lead oxide, strontium carbonate, calcium carbonate and copper oxide. A second powdered mixture is then prepared of strontium carbonate, calcium carbonate and copper oxide. The mixtures are calcined separately with the two mixtures then combined. The resulting combined mixture is then subjected to a powder in tube deformation and thermal processing to produce a substantially phase pure (Bi,Pb)-Sr-Ca-Cu-O superconductor.
  • Two-powder processes for the synthesis of superconducting (Bi, Pb)-2223/Ag-clad wires by the oxide-powder-in-the-robe are provided. The first precursor powder, of nominal stoichiometry CaCuO.sub.x, is a solution-synthesized mixture of Ca.sub.0.45 Cu.sub.0.55 O.sub.2 and CaO. Using these oxide precursor mixtures, superconducting tapes with well-aligned grains and reproducible critical current densities J.sub.c in the range of 20,000 to 26,000 A/cm.sup.2 at 75 K in self-field after annealing less than 200 hours were obtained.
  • This patent describes a process for the formation or enhancement of superconducting properties in a superconductivity-susceptible material. It comprises reacting reactants which produce the material in a formation zone during a temperature cycle indicating cycle including a temperature of at least the sintering temperature of the reactants to form the material; and imposing across the formation zone substantially throughout the temperature cycle of formation of the material a continuous magnetic field of 1 to 10 tesla to form or enhance superconducting properties in the material.