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New method of synthesis and physical properties of thick superconducting Er-123 films
- Source :
- Physica C: Superconductivity. 468:1345-1349
- Publication Year :
- 2008
- Publisher :
- Elsevier BV, 2008.
-
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.
- Subjects :
- Superconductivity
Materials science
Manufacturing process
Scanning electron microscope
Annealing (metallurgy)
Screen printing
Energy Engineering and Power Technology
Nanotechnology
Electrical and Electronic Engineering
Composite material
Condensed Matter Physics
Grain size
Electronic, Optical and Magnetic Materials
Subjects
Details
- ISSN :
- 09214534
- Volume :
- 468
- Database :
- OpenAIRE
- Journal :
- Physica C: Superconductivity
- Accession number :
- edsair.doi...........01681aca3604bac379a2bdb52c298f11