Mössbauer study of the valence state of 57Fe after 57Co decay in CoFe2O4

Cruset, A.; Friedt, J.M.

doi:10.1002/pssb.2220450120

Cited by 27 publications

(7 citation statements)

References 12 publications

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“…This result (57C~2+ -+ -+ 5TmFe3+) cannot obviously be considered as an evidence for the existence of aftereffects since stable iron incorporated at Co2+ sites also manifests itself as Fe3+. Similarly, the appearance in the emission spectrum of (Fe2+)[Fe3+ 5 7 C~2 + ] 0 4 of a line corresponding to Fe3+ (as a result of the process 5 7 C~3 + -+ 57mFe3+) is in no way of proof of the existence of after-effects following EC in 57C0 [55] since in this case apparently we have the same situation as for CoRh204.…”

Section: ( 3 + ) / ( 2 + )mentioning

confidence: 92%

A study of radiation defects in solids by means of Mössbauer spectroscopy

Серегин

Насрединов

Vasil’ev³

1978

Phys. Stat. Sol. (a)

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Section: ( 3 + ) / ( 2 + )mentioning

confidence: 92%

A study of radiation defects in solids by means of Mössbauer spectroscopy

Серегин

Насрединов

Vasil’ev³

1978

Phys. Stat. Sol. (a)

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“…The origin of the reduction is attributed to reduced number of magnetic interaction paths working on the surface 57 Fe 3+ ions compared with the bulk ones, as was discussed in detail for a-Fe 2 0 3 [2,4]. Cruset and Friedt measured emission Mössbauer spectra of 57 Co 2+ incorporated in the bulk of CoFe 2 0 4 [15]. They observed a single six-line hyperfine pattern with a hyperfine field of 495 kOe at 295 K. The value is 3% lower than that of Fe 3+ at Β site of the substrate, which was attributed to a decease of the overlap of the electron wave functions of Fe 3+ and O 2 " due to the smaller ionic radius of Fe 3+ as compared to that of Co 2+ .…”

Section: (A) In Situ Emission Mössbauer Spectra and (B) The Distribmentioning

confidence: 96%

Complexation of Uranium VI with the Siderophore Pyoverdine

et al. 1998

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The complexation of uranyl ion by the bacterial siderophore pyoverdine A in aqueous solution has been monitored with the aid of UV-visible spectroscopy. The complexing molecule was employed either in intact form or in a partially modified state by the action of laser illumination prior to complexation. In both cases, models were developed which took into account hydrolysis of uranium and permitted an excellent fit with the experimental data. The complexation constants are AT, = (8.2±0.5) · 10" 4 M in the case of unmodified pyoverdine and K\ = (2.0±0.3) · ΙΟ" 3 M for partially degraded pyoverdine.

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“…Cruset and Friedt (19) have proposed thermodynamic criteria for defect charge stabilization. The stabilization condition is given as…”

mentioning

confidence: 99%

In Situ Studies of the Passivation and Anodic Oxidation of Cobalt by Emission Mössbauer Spectroscopy: I . Theoretical Background, Experimental Methods, and Experimental Results for Borate Solution (pH 8.5)

Simmons

Kellerman

Leidheiser

1976

J. Electrochem. Soc.

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This paper is the first in a series of three that describe the application of emission Mössbauer spectroscopy to the in situ study of the cathodic and anodic behavior of cobalt. A brief review of the emission technique is given, along with a review of the chemical effects and Auger “after effects” that are associated with this experimental method. The surface sensitivity required to study thin anodic films was obtained by electrodepositing from 20 to 200Å thick Co57 active layers on cobalt surfaces. Emission Mössbauer spectra from Fe57 daughter (“probe”) atoms were obtained during polarization (vs. SCE) of specimens in buffered borate, pH 8.5. The specimens were free of surface oxide during cathodic polarization at −1100 mV. The spectra of specimens polarized at low passivating potentials, −100 mV, indicated the presence of both +2 and +3 charges. The +3 oxidation state of the Fe57 probe in the anodic film formed at this potential may arise from Auger after effects or chemical effects rather than from +3 states of the parent Co57. At higher passivating potentials +200 and +500 mV only the +3 oxidation state was observed. The existence of +2 oxidation state cannot be ruled out, however, because of the possibility for stabilization of defect charge states. Evidence for the +4 oxidation state in addition to +3 was found for specimens polarized at potentials in the transpassive range, +800 mV.

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Mössbauer study of the valence state of ⁵⁷Fe after ⁵⁷Co decay in CoFe₂O₄

Cited by 27 publications

References 12 publications

A study of radiation defects in solids by means of Mössbauer spectroscopy

A study of radiation defects in solids by means of Mössbauer spectroscopy

Complexation of Uranium VI with the Siderophore Pyoverdine

In Situ Studies of the Passivation and Anodic Oxidation of Cobalt by Emission Mössbauer Spectroscopy: I . Theoretical Background, Experimental Methods, and Experimental Results for Borate Solution (pH 8.5)

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