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Influence of growth parameters on the microstructure of directionally solidified Bi2Sr2CaCu2Oy

Published online by Cambridge University Press:  31 January 2011

M. J. Cima ,
X. P. Jiang ,
H. M. Chow ,
J. S. Haggerty ,
M. C. Flemings ,
H. D. Brody ,
R. A. Laudise  and
D. W. Johnson
M. J. Cima
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
X. P. Jiang
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
H. M. Chow
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
J. S. Haggerty
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
M. C. Flemings
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
H. D. Brody
Affiliation:
University of Pittsburgh, Pittsburgh, Pennsylvania 15261
R. A. Laudise
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07922
D. W. Johnson
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07922
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Abstract

Laser-heated float zone growth was used to study the directional solidification behavior of Bi–Sr–Ca–Cu–O superconductors. The phases that solidify from the melt, their morphology, and their composition are altered by growth rate. Highly textured microstructures are achieved by directional solidification at all growth rates. The superconducting phase is found always to have the composition Bi2.5Sr2CaCu2.2Oy when grown from boules with composition 2:2:1:2 (BiO1.5:SrO:CaO:CuO). Planar growth fronts of Bi2.5Sr2CaCu2.2Oy are observed when the temperature gradient divided by the growth rate (G/R) is larger than 3 ⊠ 1011 K-s/m2 in 2.75 atm oxygen. Thus, the 2212 compound was observed to solidify directly from the melt at the slowest growth rates used in this study. Measurement of the steady-state liquid zone composition indicates that it becomes bismuth-rich as the growth rate decreases. Dendrites of the primary solidification phase, (Sr1−xCax)14Cu24Oy, form in a matrix of Bi2.5Sr2CaCu2.2Oy when G/R is somewhat less than 3 ⊠ 1011 K-s/m2. Observed microstructures are consistent with a peritectic relationship among Bi2.5Sr2CaCu2.2Oy, (Sr1−xCax)14Cu24Oy (x = 0.4), and a liquid rich in bismuth at elevated oxygen pressure. At lower values of G/R, Sr3Ca2Cu5Oy is the primary solidification phase and negligible Bi2.5Sr2CaCu2.2Oy forms in the matrix.

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Articles
Information
Journal of Materials Research , Volume 5 , Issue 9 , September 1990 , pp. 1834 - 1849
Copyright
Copyright © Materials Research Society 1990

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