Abnormal Grain Growth in Alumina: Synergistic Effects of Yttria and Silica
10.1111/j.1151-2916.2003.tb03354.x
Crossref journal-article
Wiley
Journal of the American Ceramic Society (311)
Abstract

Abnormal grain growth without strong anisotropy or faceting of the grains has been observed in high‐purity yttria‐doped alumina specimens, often starting at the surface and spreading right through the bulk at higher sintering temperatures. This appears to occur because of an interaction between Si contamination from sintering and the yttria doping; no such effect is seen for undoped samples. Similar microstructures were observed after deliberate Y/Si codoping. Analytical STEM showed that some grain boundaries bordering on large grains contained more Si than Y. HRTEM and diffuse dark‐field imaging revealed thin (0.5–0.9 nm) disordered layers at some boundaries bordering large grains. It appears that Si impurities are accumulating at some boundaries and together with the Y inducing a grain boundary structural transformation that accounts for the dramatically increased mobility of these boundaries.

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MacLaren, I., Cannon, R. M., Gülgün, M. A., Voytovych, R., Popescu‐Pogrion, N., Scheu, C., Täffner, U., & Rühle, M. (2003). Abnormal Grain Growth in Alumina: Synergistic Effects of Yttria and Silica. Journal of the American Ceramic Society, 86(4), 650–659. Portico.

Authors 8
  1. Ian MacLaren (first)
  2. Rowland M. Cannon (additional)
  3. Mehmet A. Gülgün (additional)
  4. Rayisa Voytovych (additional)
  5. Nicoletta Popescu‐Pogrion (additional)
  6. Christina Scheu (additional)
  7. Ulrike Täffner (additional)
  8. Manfred Rühle (additional)
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Dates
Type When
Created 16 years, 1 month ago (July 18, 2009, 1:09 a.m.)
Deposited 1 year, 8 months ago (Nov. 22, 2023, 4:15 p.m.)
Indexed 2 weeks, 1 day ago (Aug. 7, 2025, 4:57 a.m.)
Issued 22 years, 4 months ago (April 1, 2003)
Published 22 years, 4 months ago (April 1, 2003)
Published Online 20 years, 8 months ago (Dec. 20, 2004)
Published Print 22 years, 4 months ago (April 1, 2003)
Funders 0

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@article{MacLaren_2003, title={Abnormal Grain Growth in Alumina: Synergistic Effects of Yttria and Silica}, volume={86}, ISSN={1551-2916}, url={http://dx.doi.org/10.1111/j.1151-2916.2003.tb03354.x}, DOI={10.1111/j.1151-2916.2003.tb03354.x}, number={4}, journal={Journal of the American Ceramic Society}, publisher={Wiley}, author={MacLaren, Ian and Cannon, Rowland M. and Gülgün, Mehmet A. and Voytovych, Rayisa and Popescu‐Pogrion, Nicoletta and Scheu, Christina and Täffner, Ulrike and Rühle, Manfred}, year={2003}, month=apr, pages={650–59} }