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Surface mass transport of alumina

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Abstract

The kinetics of thermal grooving at the intersection of rhombohedral twin boundaries with the\((10\bar 10)\) plane in aluminium oxide were measured from 1773 to 2273 K. Analysis of the data using the model of Mullins showed that surface diffusion was the dominant mechanism for mass transport. The results were compared with other similar published work on alumina, and the following equation for surface diffusion was determined:

$$D_s (cm^2 sec^{ - 1} ) = 4.05 x 10^5 exp - (452kJ mol^{ - 1} /RT).$$

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Author notes

  1. A. R. Gaddipati

    Present address: Ceramics Branch, Inorganic Materials Laboratory, General Electric Company, Corporate Research and Development Center, 12301, Schenectady, New York, USA

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Washington, 98195, Seattle, Washington, USA

    A. R. Gaddipati & William D. Scott

Authors
  1. A. R. Gaddipati
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  2. William D. Scott
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Gaddipati, A.R., Scott, W.D. Surface mass transport of alumina. J Mater Sci 21, 419–423 (1986). https://doi.org/10.1007/BF01145503

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  • DOI: https://doi.org/10.1007/BF01145503

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