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Mineralogical Magazine; October 1998; v. 62; no. 5; p. 607-615
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Fe-Mn cation ordering in fayalite-tephroite (Fe x Mn (sub 1-x) ) 2 SiO 4 olivines; a neutron diffraction study

Simon A. T. Redfern, K. S. Knight, C. M. B. Henderson, and B. J. Wood

University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
ISIS, United Kingdom
University of Manchester, United Kingdom
University of Bristol, United Kingdom

Time-of-flight neutron powder diffraction has been employed to determine precise occupancies of the M1 and M2 metal cation sites in synthetic olivines of compositions (Fe (sub 0.3) Mn (sub 0.7) ) 2 SiO 4 , (Fe (sub 0.5) Mn (sub 0.5) ) 2 SiO 4 , and (Fe (sub 0.7) Mn (sub 0.3) ) 2 SiO 4 . The distribution coefficient for Fe-Mn exchange in these samples has values of 4.864, 3.976, and 4.078, reflecting the preference of Mn (super 2+) for the M2 site, over Fe (super 2+) . These results, and the behaviour of the difference in mean bond lengths of the two sites, indicate that, while showing a tendency towards ordering, the composition-dependence of the solid solution is near ideal.

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