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A Study of the Tetragonal-To-Orthorhombic Transition of YBa2Cu3Ox by Dilatometry

Published online by Cambridge University Press:  28 February 2011

S. C. Han  and
Z. L. Wu
S. C. Han
Affiliation:
Shanghai Institute of Metallurgy, Academy of Sciences of China Shanghai, China 200050
Z. L. Wu
Affiliation:
Shanghai Institute of Metallurgy, Academy of Sciences of China Shanghai, China 200050
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Abstract

An YBa2Cu3Ox bar specimen was air annealed at 930°C followed by water quenching under protection of a quartz sheath, then annealed at a series of temperatures between 300° -500°C. Isothermal dilatation curves were measured at each annealing temperature. An Avrami type plot of these data gave rise to an activation energy H=1.2eV for the tetragonal-to-orthorhombic reaction. It is suggested that this is the activation enthalpy of oxygen diffusion in the tetragonal phase which remains continuous and therefore rate controlling throughout the whole course of transition. Based upon this transition process, we expect a fully annealed specimen to be composed of numerous superconducting domains separated by a continuous film of semiconducting tetragonal phase, one or two molecular layers thick. At the points of contact, this film is highly strained by the impinging domains, rendering the material superconductive by S/N/S junctions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 887
Copyright
Copyright © Materials Research Society 1988

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References

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