Process for making superconductors using barium hydroxide

Horowitz, H S

Title: Process for making superconductors using barium hydroxide

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Abstract

This patent describes a process for preparing a superconducting composition of the formula M{sub 1}Ba{sub 2}Cu{sub 3}O{sub x} wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu, and x is a numerical value in the range of about 6.5 to 7.0. It comprises forming a suspension by mixing barium hydroxide and M{sub 2}O{sub 3} with an aqueous solution of a cupric carboxylate or cupric nitrate at a temperature from about 50{degrees} C to about 100{degrees} C or mixing barium hydroxide with an aqueous solution of a cupric carboxylate or cupric nitrate and an M-carboxylate or M-nitrate at a temperature from about 50{degrees} C to about 100{degrees} C to obtain a suspension having M:Ba:Cu present in an atomic ratio of about 1:2:3; drying the suspension formed in step (a) to obtain a precursor; and heating the precursor in an oxygen-containing atmosphere at a temperature of about 850{degrees} C to about 950{degrees} C for a time sufficient to from M{sub 1}Ba{sub 2}Cu{sub 3}O{sub y} where y is from about 6.0 to about 6.4 and maintaining the M{sub 1}Ba{sub 2}Cu{sub 3}O{sub y} in an oxygen-containing atmosphere while cooling for a timemore »« less

Inventors:: Horowitz, H S

Publication Date:: Tue Oct 29 00:00:00 EST 1991

OSTI Identifier:: 5353559

Patent Number(s):: US 5061683; A

Application Number:: PPN: US 7-197961

Assignee:: E.I. Du Pont de Nemours and Co., Wilmington, DE (United States)

Resource Type:: Patent

Resource Relation:: Patent File Date: 31 May 1988

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; COPPER OXIDES; SUPERCONDUCTIVITY; SUPERCONDUCTORS; CHEMICAL COMPOSITION; AQUEOUS SOLUTIONS; BARIUM HYDROXIDES; CHEMICAL PREPARATION; CHEMICAL REACTION KINETICS; EUROPIUM; GADOLINIUM; HOLMIUM; NEODYMIUM; PRECURSOR; SAMARIUM; YTTERBIUM; YTTRIUM; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; DISPERSIONS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; HYDROGEN COMPOUNDS; HYDROXIDES; KINETICS; METALS; MIXTURES; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTHS; REACTION KINETICS; SOLUTIONS; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; 665411* - Basic Superconductivity Studies- (1992-); 665412 - Superconducting Devices- (1992-); 360207 - Ceramics, Cermets, & Refractories- Superconducting Properties- (1992-)

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                    Horowitz, H S. Process for making superconductors using barium hydroxide.  United States: N. p., 1991. 
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                    Horowitz, H S. Process for making superconductors using barium hydroxide.  United States.

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                    Horowitz, H S. 1991.  
        "Process for making superconductors using barium hydroxide".  United States.

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@article{osti_5353559,

  title        = {Process for making superconductors using barium hydroxide},

  author       = {Horowitz, H S},

  abstractNote = {This patent describes a process for preparing a superconducting composition of the formula M{sub 1}Ba{sub 2}Cu{sub 3}O{sub x} wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu, and x is a numerical value in the range of about 6.5 to 7.0. It comprises forming a suspension by mixing barium hydroxide and M{sub 2}O{sub 3} with an aqueous solution of a cupric carboxylate or cupric nitrate at a temperature from about 50{degrees} C to about 100{degrees} C or mixing barium hydroxide with an aqueous solution of a cupric carboxylate or cupric nitrate and an M-carboxylate or M-nitrate at a temperature from about 50{degrees} C to about 100{degrees} C to obtain a suspension having M:Ba:Cu present in an atomic ratio of about 1:2:3; drying the suspension formed in step (a) to obtain a precursor; and heating the precursor in an oxygen-containing atmosphere at a temperature of about 850{degrees} C to about 950{degrees} C for a time sufficient to from M{sub 1}Ba{sub 2}Cu{sub 3}O{sub y} where y is from about 6.0 to about 6.4 and maintaining the M{sub 1}Ba{sub 2}Cu{sub 3}O{sub y} in an oxygen-containing atmosphere while cooling for a time sufficient to obtain M{sub 1}Ba{sub 2}Cu{sub 3}O{sub x}.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/5353559},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Oct 29 00:00:00 EST 1991},

  month        = {Tue Oct 29 00:00:00 EST 1991}

}

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