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Thermal expansion behavior of bulk Bi-based (2223) superconductors

Published online by Cambridge University Press:  31 January 2011

A. Bellosi ,
G. Celotti ,
E. Landi  and
A. Tampieri
A. Bellosi
Affiliation:
IRTEC-CNR, Research Institute for Ceramics Technology, via Granarolo 64, 48018 Faenza, Italy
G. Celotti
Affiliation:
IRTEC-CNR, Research Institute for Ceramics Technology, via Granarolo 64, 48018 Faenza, Italy
E. Landi
Affiliation:
IRTEC-CNR, Research Institute for Ceramics Technology, via Granarolo 64, 48018 Faenza, Italy
A. Tampieri
Affiliation:
IRTEC-CNR, Research Institute for Ceramics Technology, via Granarolo 64, 48018 Faenza, Italy
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Abstract

The thermal expansion coefficient of Bi-based 2223 and 2212 ceramics has been measured using dilatometric apparatus. Different typologies of bulk superconducting samples have been tested, in particular (2223) phase fully dense hot-pressed samples both parallel and perpendicular to the direction of applied pressure, pressureless sintered samples, and finally hot-pressed (2212) phase specimen, in order to gather information on the contribution of secondary phase to thermal expansion behavior. From the observed α (thermal expansion coefficient) values, accounting for the sample orientation degree, it was possible to distinguish the contributions along the basic crystallographic directions and to determine the following for (2223) phase: αa = 12.2 × 10-6 °C-1, and αc = 20.8 × 10-6 °C-1 for temperatures 200–600 °C. Theoretical α values were then calculated for the different samples and successfully compared with the measured ones. As regards (2212) phase, thermal expansion coefficient was evaluated for the oriented sample, and a value for random one extrapolated; the results are very similar to that of (2223), but lower with respect to previously reported data in air atmosphere.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 7 , July 1996 , pp. 1627 - 1634
Copyright
Copyright © Materials Research Society 1996

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References

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