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Order-disorder (OD) polytypism of K3FeTe2O8(OH)2(H2O)1+x
Tobias Wolflehner1, Berthold Stöger1
1X-Ray Centre, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria.
Abstract:
K3FeTe2O8(OH)2(H2O)2 was synthesized under hydrothermal conditions from Te(OH)6, FeSO4·7H2O and 85 wt% KOH in a 1:2:6 molar ratio. The crystal structure is built of a triperiodic network. One disordered water molecule per formula unit is located in a channel and can be partially removed by heating. Systematic one-dimensional diffuse scattering indicates a polytypic character, which is best described by application of the order-disorder theory. The major polytype is monoclinic with pseudo-orthorhombic metrics. It is interrupted by fragments of an orthorhombic polytype. The diffraction intensities are analyzed using structure factor calculations.
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