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YBCO thick films on alumina substrates with sprayed YSZ buffer layers

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
239
Issue
1
Identifiers
DOI: 10.1016/0925-8388(96)02240-2
Keywords
  • High-Tcsuperconductors
  • YBaCuO
  • Thick Films
  • Sprayed Buffer Layers
Disciplines
  • Physics

Abstract

Abstract YBCO thick films of 10–30 μm thickness were fabricated on polycrystalline alumina substrates using a simple screen-printing method. All films on bare alumina substrate showed very poor or non-superconducting properties above 77 K due to aluminium diffusion from the substrate into the film. We have therefore fabricated yttria-stabilized-zirconia (YSZ) buffer layers on alumina substrates by the screen-printing method or by spraying a suspension consisting of ultrafine YSZ powders. The sprayed buffer layers showed a dense and less cracked structure compared with the screen-printed layers, and were found to act as a successful buffer to aluminium diffusion. The J c values of YBCO films on sprayed layers, fired by the solid-phase sintering method and the liquid-phase processing method, were about 400 and 1300 A cm −2 respectively at 77 K, 0 T. These values are about two-thirds of those for films on single-crystal YSZ substrates.

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