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Expansion of Pb2Sr2Y1-xCaxCu3O8+δ and Ba2YCu3O6+δ

Published online by Cambridge University Press:  28 February 2011

H. M. O'Bryan  and
P. K. Gallagher
H. M. O'Bryan
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
P. K. Gallagher
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
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Abstract

The expansions of Pb2Sr2Y1-xCaxO8+δ for x=0, 0.2 and 0.4 and Ba2YCu3O6+δ have been determined during heating to 700°C. Thermal and compositional components of the expansion have been identified by using different atmospheres. In N2 only thermal expansion with a CTE~13 ppm/*C is noted, while in O2 compositional effects are domina nt. At 550* the incorporation of 1.2 atoms of oxygen by Pb2Sr2YCu3O8 produces an expansion -0.4%. This behavior contrasts to the -0.2% shrinkage which occurs for Ba2YCu3O6.2 when -0.6 atom of oxygen is added. The different expansion behaviors of the two compounds are explained in terms of their structures and the position of the removable oxygen.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 1093
Copyright
Copyright © Materials Research Society 1990

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