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Importance of the pyrolysis for microstructure and superconducting properties of CSD-grown GdBa$_{2}$Cu$_{3}$O$_{7-x}$-HfO$_{2}$ nanocomposite films by the ex-situ approach

Cayado, Pablo; Rijckaert, H.; Bruneel, E.; Erbe, Manuela; Hänisch, Jens; Van Driessche, I.; Holzapfel, Bernhard

Abstract:
For the first time, GdBa$_{2}$Cu$_{3}$O$_{7-x}$ nanocomposites were prepared by chemical solution deposition following the ex-situ approach. In particular, ~ 220 nm GdBa$_{2}$Cu$_{3}$O$_{7-x}$-HfO$_{2}$ (GdBCO-HfO$_{2}$) nanocomposite films were fabricated starting from a colloidal solution of 5 mol% HfO2 nanoparticles. Hereby, one of the main challenges is to avoid the accumulation of the nanoparticles at the substrate interface during the pyrolysis, which would later prevent the epitaxial nucleation of the GdBCO grains. Therefore, the effect of pyrolysis processing parameters such as heating ramp and temperature on the homogeneity of the nanoparticle distribution has been investigated. By increasing the heating ramp to 300 °C/h and decreasing the final temperature to 300 °C, a more homogenous nanoparticle distribution was achieved. This translates into improved superconducting properties of the grown films reaching critical temperatures (T$_{c}$) of 94.5 K and self-field critical current densities (𝐽$_{c}$$^{sf}$) at 77 K of 2.1 MA/cm$^{2}$ with respect to films pyrolyzed at higher temperatures or lower heating ramps.


Verlagsausgabe §
DOI: 10.5445/IR/1000126632
Veröffentlicht am 24.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000126632
HGF-Programm 37.06.02 (POF III, LK 01) New Power Network Technology
Erschienen in Scientific reports
Verlag Springer Nature
Band 10
Seiten Art. Nr.: 19469
Vorab online veröffentlicht am 10.11.2020
Nachgewiesen in Dimensions
Web of Science
Scopus
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