期刊
ADVANCED ELECTRONIC MATERIALS
卷 2, 期 10, 页码 -出版社
WILEY-BLACKWELL
DOI: 10.1002/aelm.201600161
关键词
chemical solution deposition; nanocomposites; nanoparticles; TFA-YBCO
资金
- BOF research fund of Ghent University [BOF11/DOC/286]
- FWO Flanders [F08512]
- Eurotapes, a collaborative project - European Community's Seven Framework Program [EU-FP7 NMP-LA-2012-280432]
- MINECO
- FEDER [MAT2014-51778-C2-1-R]
- Center of Excellence award Severo from the Generalitat of Catalunya [OchoaSEV-2015-0496, SGR753]
- RyC [2013-12448]
Although high temperature superconductors are promising for power applications, the production of low-cost coated conductors with high current densitiesat high magnetic fieldsremains challenging. A superior superconducting YBa2Cu3O7- nanocomposite is fabricated via chemical solution deposition (CSD) using preformed nanocrystals (NCs). Preformed, colloidally stable ZrO2 NCs are added to the trifluoroacetic acid based precursor solution and the NCs' stability is confirmed up to 50 mol% for at least 2.5 months. These NCs tend to disrupt the epitaxial growth of YBa2Cu3O7-, unless a thin seed layer is applied. A 10 mol% ZrO2 NC addition proved to be optimal, yielding a critical current density J(C) of 5 MA cm(-2) at 77 K in self-field. Importantly, this new approach results in a smaller magnetic field decay of J(C)(H//c) for the nanocomposite compared to a pristine film. Furthermore, microstructural analysis of the YBa2Cu3O7- nanocomposite films reveals that different strain generation mechanisms may occur compared to the spontaneous segregation approach. Yet, the generated nanostrain in the YBa2Cu3O7- nanocomposite results in an improvement of the superconducting properties similar to the spontaneous segregation approach. This new approach, using preformed NCs in CSD coatings, can be of great potential for high magnetic field applications.
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