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

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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.

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Authors and Affiliations

  1. IRTEC-CNR, Research Institute for Ceramics Technology, via Granarolo 64, 48018, Faenza, Italy

    A. Bellosi, G. Celotti, E. Landi & A. Tampieri

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  1. A. Bellosi
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  2. G. Celotti
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  3. E. Landi
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  4. A. Tampieri
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Bellosi, A., Celotti, G., Landi, E. et al. Thermal expansion behavior of bulk Bi-based (2223) superconductors. Journal of Materials Research 11, 1627–1634 (1996). https://doi.org/10.1557/JMR.1996.0204

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  • DOI: https://doi.org/10.1557/JMR.1996.0204

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