Abstract
High Tc Y-Ba-Cu-O superconducting thick films having Tc at 87 K and R=O at 79 K have been successfully made by using conventional thick film screen printing technology on MgO and ZrO2 substrates. Film/substrate interactions were examined by electron microprobe analysis as a function of starting powders, heat treatments and substrates. At processing temperatures of 950°C, Ba and Y enrich at the substrate reaction boundary layer (~ 2 μm thick) with depletion of Cu in the superconductor for all the substrates we examined. On the other hand, Cu segregates more at the interface layer than Y and Ba in films fired at 900°C. The fired film microstructures were found to vary strongly with starting powders which demonstrated quite a difference in both densification and grain growth rates. Good superconducting films were never achieved on an alumina substrate. Limited film/substrate interactions were proved to preserve superconducting integrity and to have adhesion greater than 20 newtons, which is adequate for most of microelectronic applications.
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© 1989 Springer Japan
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Hu, YH., Booth, C.L. (1989). High Tc Y-Ba-Cu-O Superconducting Thick Films Fabrication and Film/Substrate Interactions. In: Kitazawa, K., Ishiguro, T. (eds) Advances in Superconductivity. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68084-0_109
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DOI: https://doi.org/10.1007/978-4-431-68084-0_109
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-68086-4
Online ISBN: 978-4-431-68084-0
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