Interdiffusion between Sputtered MgO Films and Sapphire Substrates

  • Jerrold Van Hook


Single crystalline αAl2O3 (sapphire) is a useful substrate material for a variety of thin film applications because of its inertness to processing chemicals and most film materials and the availability of high purity single crystalline substrates at reasonable size and cost. However, for films of the high temperature superconducting (HTS) oxides such as YBa2Cu3 O7−x (YBCO) grown directly on sapphire, there is a degradation in HTS properties occurring when deposition or subsequent annealing is carried out at high temperatures. In the early studies1 of YBCO on sapphire, the films were annealed at temperatures in the range of 850°–1000°C where interaction with sapphire was appreciable. More recent work2 has emphasized processing at temperatures as low as 400°C which significantly reduces but does not eliminate substrate-film interactions.


High Temperature Superconducting Spinel Formation Spinel Layer Profilometer Measurement High Temperature Superconducting Film 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. M. Tarascon, L. H. Greene, W. R. McKinnon, and G. W. Hull, Superconductivity in rare-earth-doped oxygen deficient perovskites, Solid State Commun. 63:499 (1987).ADSCrossRefGoogle Scholar
  2. 2.
    S. Witanachchi, H. S. Kwok, X. W. Wang and D. T. Shaw, Deposition of superconducting Y-Ba-Cu-O films at 400°C without post-annealing, Appl. Phys. Lett. 53:234 (1988).ADSCrossRefGoogle Scholar
  3. 3.
    J. S. Thorp and N. Enayati-Rad, The dielectric behavior of single crystal MgO, Fe/MgO and Cr/MgO, J. Mater. Sci. 16:255 (1981).ADSCrossRefGoogle Scholar
  4. 4.
    W. P. Whitney and V. S. Stubican, Interdiffusion studies in the system Mg0-Al203, J. Phys. Chem. Solids 32:305 (1971).ADSCrossRefGoogle Scholar
  5. 5.
    W. D. Kingery, H. C. Bowen, and D. R. Uhlmann, Atom Mobility, in: “Introduction to Ceramics,” Wiley Interscience (1976).Google Scholar
  6. 6.
    J. Talvacchio, G. R. Wagner, and H. C. Pohl, YBa Cu307 films grown on epitaxial Mg0 buffer layers on sapphire, submitted to Physica C (July, 1989 ).Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Jerrold Van Hook
    • 1
  1. 1.Raytheon CompanyLexingtonUSA

Personalised recommendations