Abstract
The literature data on thermal behavior of crystalline nickel fluorides NiF3 and Ni2F5 in the higher oxidation states are analyzed. Their enthalpies of formation are calculated: ΔfHo(Ni[NiF6](cr), 0 K) = -1399.6 ± 6 and ΔfHo(Ni2F5(cr), 0 K) = −1370.5 ± 8 kJ/mol. The partial saturated vapor pressures in the NiF3–Ni2F5 and Ni2F5–NiF2 systems over a broad temperature range are determined. The technical impossibility to achieve a measurable pressure of NiF3 is shown. The findings are compared to the data for similar derivatives of 3d-block elements and ruthenium and platinum trifluorides. Ni2F5(cr) is suggested to be used as a fluorine accumulator.
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