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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/34548
Record Status
Checked
Record Id
34548
Title
Rietveld refinement of the structures of dry-synthesized MFe
III
Si
2
O
6
leucites (M = K, Rb, Cs) by synchrotron X-ray powder diffraction
Contributors
AMT Bell (SERC Daresbury Lab.)
,
CMB Henderson (Manchester U.)
Abstract
Analyses of high-resolution synchrotron X-ray powder diffraction patterns of dry-synthesized MFe(III)Si2O6 leucites (M = K, Rb, Cs) showed that the K- and Rb-containing leucites (iron potassium silicate, KFeSi2O6, and iron rubidium silicate, RbFeSi2O6) each have a tetragonal I4(1)/a structure and the Cs-containing leucite (caesium iron silicate, CsFeSi2O6) has a cubic Ia3BARd structure. The structures of these materials have been refined by the Rietveld method. In CsFeSi2O6 leucite, Fe(III) and Si are disordered on tetrahedral framework sites as required by space-group constraints. In KFeSi2O6 leucite, Fe shows significant ordering and is concentrated on the T3 tetrahedral site. RbFeSi2O6 leucite shows less pronounced T-site ordering reflecting the fact that it is closer to the tetragonal-cubic phase transition at which the T sites become identical.
Organisation
SRS
,
2.3
,
SERC
Keywords
Materials
,
Chemistry
,
Si-29
,
NMR
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Acta Crystallogr C
50 (1994): 1531-1536.
doi:10.1107/S0108270194004014
br1077.pdf
1994
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