Abstract
AbstractThe physico‐chemical analytical data on the systems ZnSO4(MgSO4)–CuSO4(FeSO4, CoSO4 resp.)–H2O at 25.0°C have shown that due to isodimorphous substitution of Zn2+, Mg2+ resp., in the orthorhombic crystals of ZnSO4 · 7 H2O MgSO4 · 7 H2O, resp. for Cu2+, Fe2+ or Co2+ above a specific degree of ionic substitution, the orthorhombic crystals are converted into monoclinic mixed crystals. The crystal phases are characterized by X‐ray diffraction, microscopic and optical studies. The dominant effect of the admixed Cu2+, Fe2+, Co2+ ions is explained in terms of their electronic configurations, for which, owing to the operation of the Jahn‐Teller effect, a deformation of the regular octahedral arrangement of the water ligands about the metal ion is found to occur. The strongest deforming effect is that of Cu2+ ions followed by the Fe2+ ions, the weakest deforming effect being that of Co2+ ions.
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