Abstract
The niobium–oxygen interaction in chloride–fluoride melts has been studied by methods of linear sweep voltammetry, X-ray diffraction, IR-spectroscopy and optic crystallography. The chemical reactions and their products in NaCl–KCl–K 2NbF 7; NaCl–KCl–K 3NbOF 6 and NaCl–KCl–K 3NbO 2F 4 melts have been studied. Moreover, a comparative study of the Na 2O and Nb 2O 5 dissolution in NaCl–KCl–K 2NbF 7 melt in the molar ratio range O/Nb from 0 to 2.5 was carried out. The crucial role of the relative excess K 2NbF 7 fluorine in reactions of ligand substitution in the coordination shell of niobium is shown. When the fluorine concentration in the melt is limited by its content in complex niobium fluoride, only mono oxohalide complexes are identified in the liquid phase. The addition of “free” fluoride ions results in the formation of a wide range of oxohalide complexes up to niobates depending on the O/Nb ratio.
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