Seed crystals with improved properties for melt processing superconductors for practical applications

Veal, Boyd W; Paulikas, Arvydas; Balachandran, Uthamalingam; Zhong, Wei

Title: Seed crystals with improved properties for melt processing superconductors for practical applications

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Abstract

A method of fabricating bulk superconducting material including RBa.sub.2 Cu.sub.3 O.sub.7-.delta. comprising heating compressed powder oxides and/or carbonates of R and Ba and Cu present in mole ratios to form RBa.sub.2 Cu.sub.3 O.sub.7-.delta. in physical contact with an oxide single crystal seed to a temperature sufficient to form a liquid phase in the RBa.sub.2 Cu.sub.3 O.sub.7-.delta. while maintaining the single crystal seed solid to grow the superconducting material and thereafter cooling to provide a material including RBa.sub.2 Cu.sub.3 O.sub.7-.delta.. R is a rare earth or Y or La and the single crystal seed has a lattice mismatch with RBa.sub.2 Cu.sub.3 O.sub.7-.delta. of less than about 2% at the growth temperature. The starting material may be such that the final product contains a minor amount of R.sub.2 BaCuO.sub.5.

Inventors:

Veal, Boyd W ^[1]; Paulikas, Arvydas ^[1]; Balachandran, Uthamalingam ^[2]; Zhong, Wei ^[3]

Downers Grove, IL
Hinsdale, IL
Chicago, IL

Issue Date:: 1997-01-01

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

OSTI Identifier:: 870867

Patent Number(s):: 5611854

Assignee:: University of Chicago (Chicago, IL)

Patent Classifications (CPCs):: C - CHEMISTRY C30 - CRYSTAL GROWTH C30B - SINGLE-CRYSTAL-GROWTH

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

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C - CHEMISTRY C30 - CRYSTAL GROWTH C30B - SINGLE-CRYSTAL-GROWTH
C30B9/00 - Single-crystal growth from melt solutions using molten solvents

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10S117/912 - Replenishing liquid precursor, other than a moving zone

C - CHEMISTRY C30 - CRYSTAL GROWTH C30B - SINGLE-CRYSTAL-GROWTH
C30B29/225 - {based on rare earth copper oxides, e.g. high T-superconductors}

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DOE Contract Number:: W-31109-ENG-38

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: seed; crystals; improved; properties; melt; processing; superconductors; practical; applications; method; fabricating; bulk; superconducting; material; including; rba; cu; 7-; delta; comprising; heating; compressed; powder; oxides; carbonates; mole; ratios; form; physical; contact; oxide; single; crystal; temperature; sufficient; liquid; phase; maintaining; solid; grow; thereafter; cooling; provide; rare; earth; lattice; mismatch; growth; starting; final; product; contains; minor; amount; bacuo; seed crystals; comprising heating; seed crystal; conducting material; starting material; liquid phase; rare earth; single crystal; temperature sufficient; superconducting material; material including; minor amount; final product; mole ratio; physical contact; powder oxides; oxide single; mole ratios; melt processing; improved properties; growth temperature; compressed powder; fabricating bulk; lattice mismatch; bulk superconducting; practical applications; /117/502/

Citation Formats


                    Veal, Boyd W, Paulikas, Arvydas, Balachandran, Uthamalingam, and Zhong, Wei. Seed crystals with improved properties for melt processing superconductors for practical applications.  United States: N. p., 1997. 
        Web.

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                    Veal, Boyd W, Paulikas, Arvydas, Balachandran, Uthamalingam, & Zhong, Wei. Seed crystals with improved properties for melt processing superconductors for practical applications.  United States.

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                    Veal, Boyd W, Paulikas, Arvydas, Balachandran, Uthamalingam, and Zhong, Wei. Wed .  
        "Seed crystals with improved properties for melt processing superconductors for practical applications".  United States.  https://www.osti.gov/servlets/purl/870867.

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@article{osti_870867,

  title        = {Seed crystals with improved properties for melt processing superconductors for practical applications},

  author       = {Veal, Boyd W and Paulikas, Arvydas and Balachandran, Uthamalingam and Zhong, Wei},

  abstractNote = {A method of fabricating bulk superconducting material including RBa.sub.2 Cu.sub.3 O.sub.7-.delta. comprising heating compressed powder oxides and/or carbonates of R and Ba and Cu present in mole ratios to form RBa.sub.2 Cu.sub.3 O.sub.7-.delta. in physical contact with an oxide single crystal seed to a temperature sufficient to form a liquid phase in the RBa.sub.2 Cu.sub.3 O.sub.7-.delta. while maintaining the single crystal seed solid to grow the superconducting material and thereafter cooling to provide a material including RBa.sub.2 Cu.sub.3 O.sub.7-.delta.. R is a rare earth or Y or La and the single crystal seed has a lattice mismatch with RBa.sub.2 Cu.sub.3 O.sub.7-.delta. of less than about 2% at the growth temperature. The starting material may be such that the final product contains a minor amount of R.sub.2 BaCuO.sub.5.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1997},

  month        = {1}

}

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