Abstract
We have developed a low-cost, short time manufacturing process using a novel method, starting from a mixture of Er2BaO4, BaCuO2, and CuO, with an excess of Er at expense of Ba. Several micrometers thick films were prepared by the screen-printing technique, spreading the mixture paste on silver substrates, processed then in Ar-1% O2 atmosphere. Using a double-step annealing process, we obtained good quality Er-123 thick films on silver substrates, with Tc (onset) 92 K. Formation of large flat grains was observed by scanning electron microscope. According to XRD analysis, the films were preferentially c-axis oriented. The magnetic (induced), self-field Jc measured at 77 K was above 32 kA/cm2. We observed a strong dependence of the transport current, Ic, on the grain size. The maximum Ic at 77 K as high as 10 A was observed in the sample with the average grain size around 40 μm. The present results indicate that our technology, enabling preparation of large-area superconducting thick films on Ag-based substrates in short processing times, is relatively cheap and appropriate for utilization in long-length RE-123 silver sheath wire production for commercial applications.
Original language | English |
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Pages (from-to) | 1345-1349 |
Number of pages | 5 |
Journal | Physica C: Superconductivity and its applications |
Volume | 468 |
Issue number | 15-20 |
DOIs | |
Publication status | Published - 2008 Sep 15 |
Externally published | Yes |
Keywords
- Critical current density (J) and I
- ErBaO
- LRE-BaCuO
- SEM
- Thick films
- XRD
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering