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Phase Chemistry and Micro‐Structure of Directionally Solidified Bi2Sr2CaCu2O8

Published online by Cambridge University Press:  28 February 2011

H.M. Chow ,
X.P. Jiang ,
M.J. Cima ,
J.S. Haggerty ,
H.D. Brody  and
M.C. Flemings
H.M. Chow
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science and Engineering, Cambridge, MA 02139
X.P. Jiang
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science and Engineering, Cambridge, MA 02139
M.J. Cima
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science and Engineering, Cambridge, MA 02139
J.S. Haggerty
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science and Engineering, Cambridge, MA 02139
H.D. Brody
Affiliation:
University of Pittsburgh, Department of Materials Science and Engineering, Pittsburgh,PA 15261
M.C. Flemings
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science and Engineering, Cambridge, MA 02139
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Abstract

Ceramic rods of Bi2Sr2CaCu2O8 (2212) were directionally solidified by laser‐heated float‐zone crystal growth [1]. The microstructure of the resulting material can be controlled through variation of growth rate. The 2212 phase is Sr‐deficient, having an actual composition Bi2.5Sr2CaCu2.2Oy. At slow growth rates (0.2 cm/h), plane front growth produced highly textured samples of almost phase pure 2212, and pole figures show that the solidification front proceeds along the (200) axis of the 2212 grains. Faster growth rates produced dendritic growth and polyphase microstructures. At the fastest growth rate studied (16 cm/h), no 2212 phase was observed. Observations indicate that Bi2.5Sr2CaCu2.2Oy melts peritectically into (Sr1‐x.Cax.)14Cu24Oy and a Bi‐rich liquid.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 313
Copyright
Copyright © Materials Research Society 1990

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References

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