Some formally Fe(IV) compounds, such as CaFeO 3 , are believed to contain the iron as a mixture of Fe(III) and Fe(V) Predict the key features of the 57 Fe Mssbauer spectra of this compound when described as (a) CaFe(IV)O 3 (b) CaFe(III) 0 5 Fe(V) 0 5 O 3 , assuming iron is in a regular octahedral c...

To predict the key features of the 57Fe Mssbauer spectra of the compound CaFeO3 when described as a CaFeIVO3 and b CaFeIII05FeV05O3 we need to conside ...

Some formally Fe(IV) compounds, such as CaFeO 3 , are believed to contain the iron as a

Question:

Some formally Fe(IV) compounds, such as CaFeO₃, are believed to contain the iron as a mixture of Fe(III) and Fe(V). Predict the key features of the ⁵⁷Fe Mössbauer spectra of this compound when described as

(a) CaFe(IV)O₃

(b) CaFe(III)_0.5Fe(V)_0.5O₃, assuming iron is in a regular octahedral coordination to oxygen in both descriptions. Could Mössbauer spectroscopy be used to distinguish these two descriptions? CaFeO₃ orders antiferromagnetically at low temperatures and the Mössbauer spectrum at 4 K consists of two overlying, magnetic hyperfine six-line patterns. Which is the best description of the iron oxidation states in CaFeO₃ at this temperature?

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