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Singular Grain Boundaries in Alumina and Their Roughening Transition

Published

Author(s)

C W. Park, D C. Yoon, J Blendell, C A. Handwerker

Abstract

The shapes and structures of grain boundaries formed between the basal (0001) surface of large alumina grains and randomly oriented small alumina grains are shown to depend on the additions of SiO2, CaO, and MgO. If a sapphire crystal is sintered at 1620 degrees C in contact with high purity alumina powder, the grain boundaries formed between the (0001) sapphire surface and the small alumina grains are curved and do not show any hill-and-valley structure when observed under transmission electron microscopy (TEM).These observations indicate that the grain boundaries are atomicallly rough.
Citation
Journal of the American Ceramic Society

Keywords

abnormal grain growth, alumina, grain boundary roughening transition, singular grain boundaries, SiO2, CaO, MgO addition

Citation

Park, C. , Yoon, D. , Blendell, J. and Handwerker, C. (2003), Singular Grain Boundaries in Alumina and Their Roughening Transition, Journal of the American Ceramic Society (Accessed February 21, 2024)
Created March 31, 2003, Updated October 12, 2021