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High temperature ultrasonic characterization of intrinsic and microstructural changes in ceramic YBa2Cu3O7−δ

Published online by Cambridge University Press:  31 January 2011

S. Suasmoro ,
D.S. Smith ,
M. Lejeune ,
M. Huger  and
C. Gault
S. Suasmoro
Affiliation:
Ecole Nationale Supérieure de Céramique Industrielle, URA CNRS 320, 47 à 73, Avenue Albert Thomas, 87065 Limoges, France
D.S. Smith*
Affiliation:
Ecole Nationale Supérieure de Céramique Industrielle, URA CNRS 320, 47 à 73, Avenue Albert Thomas, 87065 Limoges, France
M. Lejeune
Affiliation:
Ecole Nationale Supérieure de Céramique Industrielle, URA CNRS 320, 47 à 73, Avenue Albert Thomas, 87065 Limoges, France
M. Huger
Affiliation:
Ecole Nationale Supérieure de Céramique Industrielle, URA CNRS 320, 47 à 73, Avenue Albert Thomas, 87065 Limoges, France
C. Gault
Affiliation:
Ecole Nationale Supérieure de Céramique Industrielle, URA CNRS 320, 47 à 73, Avenue Albert Thomas, 87065 Limoges, France
*
a)Author to whom correspondence should be addressed.
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Abstract

Young's modulus of ceramic YBa2Cu3O7−δ was measured between room temperature and 1000 °C, E(T), by an ultrasonic pulse-echo technique. Experimental results are presented for nonaligned ceramics with average grain sizes from 2 to 10 μm and densities from 80% to 95% of the theoretical value. Young's modulus is shown to be strongly sensitive to oxygen content with the orthorhombic phase being significantly stiffer than the tetragonal phase. In addition, the phase transition is denoted by a pronounced minimum in E(T) relating to softening of certain bonds in the unit cell. At high temperature (>900 °C) melting of the second phase gives a steep drop in E(T) while subsequent densification increases E. Finally, cooling of large-grained ceramic below 450 °C opens microcracks due to anisotropic volume changes. This results in hysteresis between the heating and cooling curves for E(T). Hence the technique is used to show that ceramic, with an average grain size of 2 μm and 85% of theoretical density, is well oxygenated and undamaged by its thermal treatment.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 7 , July 1992 , pp. 1629 - 1635
Copyright
Copyright © Materials Research Society 1992

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