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J-phase structures in the Y-Si-Al-O-N system

Lookup NU author(s): Emeritus Professor Derek Thompson, Dr Katharine Liddell

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Abstract

Preparative studies carried out on compositions lying between Y 4Si2O7N2 (J-phase) and Y 4Al2O9 (YAM) show similar variations in structure to those already reported for related compositions in the analogous Dy-Si-Al-O-N system. Careful studies of X-ray diffraction patterns confirm that whereas all compositions have a cuspidene-like structure, there is a marked change in the a and b unit cell dimensions for x values in excess of approximately 0.8 in the general formula Y4Si2-xAl xO7+xN2-x, with much smaller changes in the c unit cell dimension and in the β angle. The results are compared with similar data previously presented for J-phase structures in the DySi-Al-O-N system.

Publication metadata

Author(s): Thompson DP, Liddell K, Yu Z-B, Gao L

Editor(s): Mandal H., Ovecoglu L.

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Key Engineering Materials: 8th Conference and Exhibition of the European Ceramic Society

Year of Conference: 2004

Pages: 1013-1016

ISSN: 1013-9826

Publisher: Trans Tech Publications Ltd.

Sponsor(s): Turkish Ceramic Society, European Ceramic Society

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