Order – disorder (OD) polytypism of K3FeTe2O8(OH)2(H2O)1+x

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.

Source: Acta Crystallographica Section B - November 7, 2023 Category: Chemistry Authors: Wolflehner, T. St ö ger, B. Tags: polytypism OD theory X-ray diffraction tellurate research papers Source Type: research