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Reaction of CaAl4O7 with (0001)-oriented α-Al2O3

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Abstract

Reactions between thin films of CA2 and (0001)-oriented α-Al2O3 have been studied using a combination of microscopy techniques. Thin films of amorphous CA2 were deposited on sapphire substrates by pulsed-laser deposition at 900 °C in an oxygen ambient atmosphere. After deposition, the reaction couples were heat treated in air for various times either at 1300 or 1400 °C. Atomic-force microscopy was used to monitor changes in the microstructure of the films. Interfaces between the different regions were examined by transmission electron microscopy (TEM) of cross-sectional samples prepared by focused ion-beam milling. The CA2 films had dewetted the substrate surface as a result of the heat treatment. An interfacial reaction layer was observed between the dewetted CA2 droplets and the substrate. The structure of this reaction layer was found to be consistent with γ-Al2O3 by computer analysis of high-resolution TEM images. There is a perfect epitaxy between the interfacial layer and the substrate. For the samples heat treated for longer times, hexagonal features were found on the substrate surface. The presence of these features on (0001)-oriented α-Al2O3 suggests that CA6 platelets form by the transformation of the interfacial reaction layer. The results are discussed in relation to the crystallization behavior of the various calcium aluminate phases and the equilibrium-phase diagram of the CaO–Al2O3 system.

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Acknowledgements

The work was initially supported by U.S. Department of Energy through grant DE-FG02-01ER45883 and subsequently by the 3M Harry Heltzer Endowed Chair, an NSF international travel grant INT-0322622 and a Turkish Science and Technology Foundation TUBITAK Bilateral Travel grant 103M038. The authors thank Dr. U. Dahmen for access to the FIB at the National Center for Electron Microscopy, Lawrence Berkeley National Laboratory; NCEM is supported by the U.S. Department of Energy under Contract # DE-AC02-05CH11231.

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Author notes

  1. A. Altay

    Present address: Envy, Energy & Environmental Investments, Inc., Ankara, 06450, Turkey

  2. C. B. Carter

    Present address: Department of Chemical, Materials & Biomolecular Engineering, University of Connecticut, Storrs, CT, 06269-3222, USA

Authors and Affiliations

  1. Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA

    A. Altay & C. B. Carter

  2. Sabanci University, FENS, Orhanli, Tuzla, 34956, Istanbul, Turkey

    M. A. Gülgün

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  1. A. Altay
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  2. C. B. Carter
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  3. M. A. Gülgün
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Correspondence to C. B. Carter.

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Altay, A., Carter, C.B. & Gülgün, M.A. Reaction of CaAl4O7 with (0001)-oriented α-Al2O3 . J Mater Sci 44, 84–92 (2009). https://doi.org/10.1007/s10853-008-3067-2

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  • DOI: https://doi.org/10.1007/s10853-008-3067-2

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