Crystal structure of synthetic voltaite (K0.90(NH4)0.10)2(Fe3.190 2+Fe1.124 3+Mg1.686)(Fe0.938 3+Mg0.062)2··(Al0.98Fe0.02 3+)(SO4)12·18.9H2O

Vahobjon Kh. Sabirov

2017

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DOI 10.1134/s0022476617010255
Data confidence 70 medium
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Abstract

Voltaite of the composition [(K0.90(NH4)0.10]2(Fe3.190 2+Fe1.124 3+Mg1.686)(Fe0.938 3+Mg0.062)2(Al0.98Fe0.02 3+)·(SO4)12·18.9H2O* is obtained by treating a polymetallic sample with sulfuric acid. The crystal structure of the substance is formed of (Fe3+,Mg)O6 and (Fe2+,Fe3+,Mg)O4(H2O)2 octahedra and a (K+, NH4 +)O12 12-vertex polyhedron arranged in a three-dimensional framework due to the bridging function of the SO4 2− ion. In the framework voids, [(Fe3+,Al)(H2O)6]3+ cations with aqua ligands are disordered over several positions.