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Formation of tetragonal YBa2Cu3O7−δ from an undercooled melt

Published online by Cambridge University Press:  03 March 2011

J.R. Olive ,
W.H. Hofmeister ,
R.J. Bayuzick ,
G. Carro ,
J.P. McHugh ,
R.H. Hopkins ,
M. Vlasse ,
J.K.R. Weber ,
P.C. Nordine  and
M. McElfresh
J.R. Olive
Affiliation:
Vanderbilt University, Nashville, Tennessee 37235
W.H. Hofmeister
Affiliation:
Vanderbilt University, Nashville, Tennessee 37235
R.J. Bayuzick
Affiliation:
Vanderbilt University, Nashville, Tennessee 37235
G. Carro
Affiliation:
Vanderbilt University, Nashville, Tennessee 37235
J.P. McHugh
Affiliation:
Westinghouse Science and Technology Center, Pittsburgh, Pennsylvania 15235
R.H. Hopkins
Affiliation:
Westinghouse Science and Technology Center, Pittsburgh, Pennsylvania 15235
M. Vlasse
Affiliation:
Marshall Space Flight Center, Huntsville, Alabama 35812
J.K.R. Weber
Affiliation:
Intersonics, Inc., Northbrook, Illinois 60062
P.C. Nordine
Affiliation:
Intersonics, Inc., Northbrook, Illinois 60062
M. McElfresh
Affiliation:
Purdue University, West Lafayette, Indiana 47907
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Abstract

Containerless processing of YBa2Cu3O7−δ was performed using an aero-acoustic levitation technique. Upon solidification from the liquid, spheres of size 2.5 mm diameter undercooled and recalesced, forming tetragonal YBa2Cu3O7−δ directly from the melt. Subsequent to solidification processing, these samples were annealed to single phase YBa2Cu3O7−δ with orthorhombic symmetry as indicated by powder XRD, SQUID magnetometer measurements indicate a sharp superconducting transition at approximately 85 K. Magnetic Jc values, calculated using the Bean critical state model, indicate that the spheres can carry critical current densities on the order of 104 A cm−2. Microstructural characterization has been performed on both the as-solidified and annealed spheres.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 9 , Issue 1 , January 1994 , pp. 1 - 3
Copyright
Copyright © Materials Research Society 1994

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References

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