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

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:
 [1];  [1];  [2];  [3]
  1. Downers Grove, IL
  2. Hinsdale, IL
  3. Chicago, IL
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
OSTI Identifier:
870867
Patent Number(s):
US 5611854
Assignee:
University of Chicago (Chicago, IL)
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.
Veal, Boyd W, Paulikas, Arvydas, Balachandran, Uthamalingam, & Zhong, Wei. Seed crystals with improved properties for melt processing superconductors for practical applications. United States.
Veal, Boyd W, Paulikas, Arvydas, Balachandran, Uthamalingam, and Zhong, Wei. 1997. "Seed crystals with improved properties for melt processing superconductors for practical applications". United States. https://www.osti.gov/servlets/purl/870867.
@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 = {},
url = {https://www.osti.gov/biblio/870867}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {1}
}