Leng-Ward, G., Lewis, M. H. and Wild, S. (1984) Diffraction studies of β''-magnesium sialon. Journal of Materials Science, Vol.19 (No.5). pp. 1726-1736. doi:10.1007/BF00563071

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Abstract

The compositions of high magnesium content/3"-magnesium sialon crystals within the
3M/4X plane of the Mg-Si-AI-O-N system indicate some form of metal atom ordering
wihtin the/3" structure. Although it is not possible using X-ray diffraction to detect weak
additional reflections arising from the ordering between magnesium, aluminium, and
silicon atoms, such weak reflections are revealed on electron diffraction photographs
for a/3" phase, resulting in a tripling of the hexagonal lattice c-dimension. These show/3"
to have a structure very similar to rhombohedral willemite (Zn2SiO4) , with the (Mg, AI)
metal atoms ordered with respect to the silicon atoms in a 2 : 1 ratio. However, there are
some additional weak diffraction spots with indices not obeying the rhombohedral condition
of --h + k + / = 3n. It is proposed that the structure of this/3" is identical to that
of willemite and the extra spots are a result of some form of twinning, which implies the
existence of "ordered microdomains".

Item Type:	Journal Article
Subjects:	Q Science > QC Physics Q Science > QD Chemistry
Library of Congress Subject Headings (LCSH):	Diffraction, Magnesium, Silicon, Aluminium, Crystallization, Atoms, Twinning (Crystallography)
Journal or Publication Title:	Journal of Materials Science
Publisher:	Chapman Hall Ltd
ISSN:	0022-2461
Official Date:	1984
Dates:	Date Event 1984 UNSPECIFIED
Volume:	Vol.19
Number:	No.5
Number of Pages:	11
Page Range:	pp. 1726-1736
DOI:	10.1007/BF00563071
Status:	Peer Reviewed
Publication Status:	Published

Data sourced from Thomson Reuters' Web of Knowledge

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