Mössbauer study of iron in high oxidation states in the K–Fe–O system

Dedushenko, S. K.; Perfiliev, Yu. D.; Saprykin, Aleksandr A.

doi:10.1007/s10751-008-9828-0

Cited by 17 publications

(10 citation statements)

References 8 publications

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“…57 Fe Mössbauer spectroscopy is used more and more as a tool for the control of the quality of ferrate(VI) preparations and as a means to follow the decomposition of ferrates in various composites, where iron is present in different oxidation states . Table shows a compilation of data from recent summaries, with some additional references, where results have not always been consistent as indicated in the above text.…”

Section: The Chemistry Of Ferrates(vi)mentioning

confidence: 99%

The History and the Current Revival of the Oxo Chemistry of Iron in its Highest Oxidation States: Fe^VI – Fe^VIII

Schmidbaur

2018

Zeitschrift anorg allge chemie

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The history of the oxo compounds of iron in its highest oxidation states is reviewed and modern activities in this long neglected area of inorganic chemistry are highlighted. The chemistry of ferrates(VI) is the most rapidly advancing branch owing to several potential applications in diverse fields such as environmental chemistry and energy storage. Convenient and high‐yield preparations of ferrates(VI) in high purity are presented, followed by a coverage of the analytical, spectroscopic, and structural characterization in the solid and in solution, with a focus on the stability of these compounds, which had long been under‐estimated. Particular attention has been paid to the fascinating mechanisms that have been proposed for the intriguing “self‐decay” of the [FeO4]2– dianion. Redox processes with inorganic and organic substrates are summarized including fresh and waste water treatment on the one hand and “super‐iron batteries” on the other. Recent advances in the experimental and computational approach to ferrates(VII) [FeO4]– and the elusive “iron tetroxide” [FeO4] are described.

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Section: The Chemistry Of Ferrates(vi)mentioning

confidence: 99%

The History and the Current Revival of the Oxo Chemistry of Iron in its Highest Oxidation States: Fe^VI – Fe^VIII

Schmidbaur

2018

Zeitschrift anorg allge chemie

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“…But oxides containing such unusually high valence state iron ions are rare. Compounds with the chemical formula A 3 FeO 4 (A = Na, K, and Rb) have been reported to contain Fe 5+ , but the only evidence of the unusual oxidation state was provided by analyses of their chemical compositions. − Although recent Mössbauer experiments for K 3 FeO 4 revealed the Fe 5+ spectrum, it changed rapidly, suggesting that this compound is unstable and easily decomposes. , …”

Section: Introductionmentioning

confidence: 99%

“…1−3 Although recent Mossbauer experiments for K 3 FeO 4 revealed the Fe 5+ spectrum, it changed rapidly, suggesting that this compound is unstable and easily decomposes. 4,5 Another example of Fe 5+ in an oxide was seen in the chargedisproportionated perovskite CaFeO 3 . 6,7 With decreasing temperature, the instability of Fe 4+ in CaFeO 3 is relieved by charge disproportionation, giving Fe 3+ and Fe 5+ ions (2Fe 4+ → Fe 3+ + Fe 5+ ).…”

Section: ■ Introductionmentioning

confidence: 99%

Geometrical Spin Frustration of Unusually High Valence Fe⁵⁺ in the Double Perovskite La₂LiFeO₆

et al. 2016

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A double perovskite-structure oxide La2LiFeO6 with unusually high-valence Fe(5+) was synthesized using a high-pressure technique. The Li(+) and Fe(5+) ions at the B site in the rhombohedral R3̅ perovskite structure are ordered in a rock salt manner, and the resultant tetrahedral network of Fe(5+) gives geometrical spin frustration, which is consistent with a large frustration index f (|θ|/TN) ≈ 10. Mg(2+) substitution for Li(+) produces Fe(4+) from some Fe(5+) and changes the magnetic properties. The Weiss temperature is increased from -119 to 21 K by the substitution of only 1%, significantly decreasing the frustration index. The geometrical frustration of the Fe(5+) spin sublattice cannot be tolerant for even a very small amount of Fe(4+) disturbance.

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“…The premise of applying Fe(VI) in real practice is its easy synthesis. The published synthesis methods of Fe(VI) so far include wet chemical method (Thompson et al, 1951), electrochemical method (Mácová et al, 2009), and thermal method (Dedushenko et al, 2009). However, the synthetic routes of all these methods are long and tedious, which are time-consuming and costly.…”

Section: Difficulty In Synthesizing and Preserving Fe(vi)mentioning

confidence: 99%

Application of Fe(VI) in abating contaminants in water: State of art and knowledge gaps

Wang

Shao

Qiao

et al. 2020

Front. Environ. Sci. Eng.

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The past two decades have witnessed the rapid development and wide application of Fe(VI) in the field of water de-contamination because of its environmentally benign character. Fe(VI) has been mainly applied as a highly efficient oxidant/disinfectant for the selective elimination of contaminants. The in situ generated iron(III) (hydr)oxides with the function of adsorption/coagulation can further increase the removal of contaminants by Fe(VI) in some cases. Because of the limitations of Fe(VI) per se, various modified methods have been developed to improve the performance of Fe(VI) oxidation technology. Based on the published literature, this paper summarized the current views on the intrinsic properties of Fe(VI) with the emphasis on the self-decay mechanism of Fe(VI). The applications of Fe (VI) as a sole oxidant for decomposing organic contaminants rich in electron-donating moieties, as a bi-functional reagent (both oxidant and coagulant) for eliminating some special contaminants, and as a disinfectant for inactivating microorganisms were systematically summarized. Moreover, the difficulties in synthesizing and preserving Fe(VI), which limits the large-scale application of Fe (VI), and the potential formation of toxic byproducts during Fe(VI) application were presented. This paper also systematically reviewed the important nodes in developing methods to improve the performance of Fe(VI) as oxidant or disinfectant in the past two decades, and proposed the future research needs for the development of Fe(VI) technologies.

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Mössbauer study of iron in high oxidation states in the K–Fe–O system

Abstract: Oxidation of metallic iron by potassium superoxide leads to the formation of ferrate(V). Under room temperature this compound is unstable and instantly decomposes by disproportionation mechanism. Grinding the substance into powder accelerates the decomposition process.

Cited by 17 publications

References 8 publications

The History and the Current Revival of the Oxo Chemistry of Iron in its Highest Oxidation States: Fe^VI – Fe^VIII

The History and the Current Revival of the Oxo Chemistry of Iron in its Highest Oxidation States: Fe^VI – Fe^VIII

Geometrical Spin Frustration of Unusually High Valence Fe⁵⁺ in the Double Perovskite La₂LiFeO₆

Application of Fe(VI) in abating contaminants in water: State of art and knowledge gaps

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Mössbauer study of iron in high oxidation states in the K–Fe–O system

Abstract: Oxidation of metallic iron by potassium superoxide leads to the formation of ferrate(V). Under room temperature this compound is unstable and instantly decomposes by disproportionation mechanism. Grinding the substance into powder accelerates the decomposition process.

Cited by 17 publications

References 8 publications

The History and the Current Revival of the Oxo Chemistry of Iron in its Highest Oxidation States: FeVI – FeVIII

The History and the Current Revival of the Oxo Chemistry of Iron in its Highest Oxidation States: FeVI – FeVIII

Geometrical Spin Frustration of Unusually High Valence Fe5+ in the Double Perovskite La2LiFeO6

Application of Fe(VI) in abating contaminants in water: State of art and knowledge gaps

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The History and the Current Revival of the Oxo Chemistry of Iron in its Highest Oxidation States: Fe^VI – Fe^VIII

The History and the Current Revival of the Oxo Chemistry of Iron in its Highest Oxidation States: Fe^VI – Fe^VIII

Geometrical Spin Frustration of Unusually High Valence Fe⁵⁺ in the Double Perovskite La₂LiFeO₆