On the use of copper-based substrates for YBCO coated conductors

E. Bemporad, A. Vannozzi, F. Fabbri, A. Augieri, A. Angrisani Armenio, V. Galluzzi, A. Mancini, F. Rizzo, A. Rufoloni, J.A. Padilla, E. Xuriguera, D. De Felicis, E. Bempoard, G. Celentano

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

It is well known that the recrystallization texture of heavily cold-rolled pure copper is almost completely cubic. However, one of the main drawbacks concerning the use of pure copper cube-textured substrates for YBCO coated conductor is the reduced secondary recrystallization temperature. The onset of secondary recrystallization (i.e., the occurrence of abnormal grains with unpredictable orientation) in pure copper substrate was observed within the typical temperature range required for buffer layer and YBCO processing (600-850 °C). To avoid the formation of abnormal grains the effect of both grain size adjustment (GSA) and recrystallization annealing was analyzed. The combined use of a small initial grain size and a recrystallization two-step annealing (TSA) drastically reduced the presence of abnormal grains in pure copper tapes. Another way to overcome the limitation imposed by the formation of abnormal grains is to deposit a buffer layer at temperatures where secondary recrystallization does not occur. For example, La2Zr2O7 (LZO) film with a high degree of epitaxy was grown by metal-organic decomposition (MOD) at 1000 °C on pure copper substrate. In several samples the substrate underwent secondary recrystallization. Our experiments indicate that the motion of grain boundaries occurring during secondary recrystallization process does not affect the quality of LZO film.
Original languageEnglish
DOIs
Publication statusPublished - 12 May 2014
Externally publishedYes
Event11th European Conference on Applied Superconductivity, EUCAS 2013 - Genoa, Italy
Duration: 12 May 2014 → …

Conference

Conference11th European Conference on Applied Superconductivity, EUCAS 2013
CountryItaly
CityGenoa
Period12/5/14 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Bemporad, E., Vannozzi, A., Fabbri, F., Augieri, A., Angrisani Armenio, A., Galluzzi, V., Mancini, A., Rizzo, F., Rufoloni, A., Padilla, J. A., Xuriguera, E., De Felicis, D., Bempoard, E., & Celentano, G. (2014). On the use of copper-based substrates for YBCO coated conductors. Paper presented at 11th European Conference on Applied Superconductivity, EUCAS 2013, Genoa, Italy. https://doi.org/10.1088/1742-6596/507/2/022048