Désordre structural et transformation de phase dans les fluosilicates de Fe, Mg, Mn

FeSiF6 6H2O shows extra reflexions inconsistent with the space group R{\bar 3}m. The same conclusion applies, for T> 300K, to MgSiF6.6H2O whose structure is similar to that of MnSiF6.6H2O. These three compounds undergo similar phase transformations with decreasing temperature.

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