Аңдатпа
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.