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

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:
 [1];  [1];  [2];  [3]
  1. (Downers Grove, IL)
  2. (Hinsdale, IL)
  3. (Chicago, IL)
Issue Date:
OSTI Identifier:
870867
Assignee:
University of Chicago (Chicago, IL) ANL
Patent Number(s):
US 5611854
Contract Number:
W-31109-ENG-38
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
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/

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