HRTEM Investigations of New AlN Polytypoids in the High-AlN Region of the AlN-Al(2)O(3)-Y(2)O(3) System

The AlN polytypoid phases in selected materials in the AlN-Al2O3-Y2O3 system has been investigated using TEM methods. Two new AlN polytypoid phases, 24H and 39R, were identified in the pseudobinary AlN-Al2O3 system. The 39R phase existed as single grains while 24H was observed only between subblocks...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2004-02, Vol.87 (2), p.275
Main Authors: Yu, Yingda, Tangen, Inger-Lise, Grande, Tor, Hoier, Ragnvald, Mari-Ann Einarsrud
Format: Article
Language:English
Subjects:
Ceramics
Chemical reactions
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Summary:The AlN polytypoid phases in selected materials in the AlN-Al2O3-Y2O3 system has been investigated using TEM methods. Two new AlN polytypoid phases, 24H and 39R, were identified in the pseudobinary AlN-Al2O3 system. The 39R phase existed as single grains while 24H was observed only between subblocks of 33R and 39R. The new polytypoids are built on the same structural models that are previously reported for the other polytypoids in the same system, consisting of arrays of planar (oxygen-containing) and corrugated inversion domain boundaries (IDBs). Only one type of interface structure was observed for the planar IDBs of the new polytypoids. [PERIODICAL ABSTRACT]
ISSN:0002-7820
1551-2916