Effect of magnesium oxide addition on surface roughening of alumina grains in anorthite liquid

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Alumina sintered with 5 wt% anorthite at 1620°C for 48 h has grains with flat boundaries and a size distribution representing abnormal grain growth. TEM observations of the grain triple junctions show flat grain surfaces, some of which are the (0001), ([Onemacr]012), and (1[Onemacr]01) planes. HRTEM observations confirm these surfaces to be atomically flat and hence singular. When sintered further after embedding in MgO powder, the {0001} and { 01[Onemacr]2} planes remain flat, but curved surface segments also appear. These curved surface segments are confirmed to be atomically rough by HRTEM. They are connected to the flat segments with discontinuously changing slopes. Thus, when MgO is added, the singular and rough surface phases coexist.
Publisher
Journal of the American Ceramic Society
Issue Date
2004-12
Language
English
Citation

Journal of the American Ceramic Society, pp.630 - 633

ISSN
0027820
URI
http://hdl.handle.net/10203/226891
Appears in Collection
RIMS Conference Papers
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