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Crystallization of Bi–Sr–Ca–Cu–O glasses in oxygen

Published online by Cambridge University Press:  31 January 2011

T.G. Holesinger ,
D.J. Miller  and
L.S. Chumbley
T.G. Holesinger
Affiliation:
Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, and Department of Materials Science and Engineering, Ames Laboratory and Iowa State University, 214 Wilhelm, Ames, Iowa 50011
D.J. Miller
Affiliation:
Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, 9700 South Cass Avenue, Illinois 60439
L.S. Chumbley
Affiliation:
Department of Materials Science and Engineering, Ames Laboratory and Iowa State University, 214 Wilhelm, Ames, Iowa 50011
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Abstract

A detailed study of the crystallization process for compositions near Bi2Sr2Ca1Cu2Oy was undertaken using differential thermal analysis (DTA), transmission and scanning electron microscopy (TEM and SEM), and x-ray diffraction (XRD). Glasses prepared by a splat-quench technique were free of secondary phases in most cases. A two-step crystallization process in oxygen was observed in which partial crystallization of the glass occurs initially with the nucleation of “2201” and Cu2O, and is completed with the formation of SrO, CaO, and Bi2Sr3−xCaxOy. No specific thermal event could be associated with the formation of the “2212” phase. Rather, formation occurs via conversion of 2201 into 2212. This was a kinetically limited process at temperatures below 800 °C as other phases were found to evolve in addition to the 2212 phase during extended anneals. In contrast, a nearly full conversion to the 2212 phase occurred after only 1 min of annealing at 800 °C and above. However, changes in resistivity data, secondary phases, and the measured 2212 composition upon extended anneals at 865 °C showed that considerably longer heat treatments were necessary for the sample to reach its equilibrium state.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 7 , July 1992 , pp. 1658 - 1671
Copyright
Copyright © Materials Research Society 1992

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