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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 ISSN 0022-2461.
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Official URL: http://dx.doi.org/10.1007/BF00563071
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 | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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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: |
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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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