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Diffraction studies of β''-magnesium sialon

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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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Official URL: http://dx.doi.org/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:
DateEvent
1984UNSPECIFIED
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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