A Raman and infrared study of a new carbonate green rust obtained by electrochemical way

Legrand, Laurent; Sagon, Gérard; Lecomte, Sophie; Chaussé, A.; Messina, R.

doi:10.1016/s0010-938x(00)00172-4

Cited by 91 publications

(58 citation statements)

References 16 publications

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“…On the other hand, Simard et al, 7 who studied the corrosion of mild steel in a HCO 3 solution, found that green rust was preceded by the formation of Fe(OH) 2 (with a band at 544 cm 1 ). Finally, our integration of the Fe 2C OH 2 and Fe 3C OH 3 bands (425 and 503 cm 1 , respectively) gave a 2 : 1 ratio (of Fe 2C /Fe 3C ), in agreement with Drissi et al, 3 Legrand et al 5,6 who found a 1 : 1 ratio. We conclude from our data that under our conditions iron was first oxidised to give Fe 2C , which then reacted with the CO 3 Although 10 cycles were performed, only the 1st, 5th and 10th are shown (for clarity).…”

Section: Resultssupporting

confidence: 91%

“…After about 30 min at OCP, two overlapping bands were observed at 425 and 503 cm 1 . These bands have been identified 5,6,8,14,16 as arising from the Fe-O stretching modes of Fe 2C -OH and Fe 3C -OH (respectively) of a hydroxy-carbonate (usually known as green rust). With time, these bands became more pronounced, but beyond about 120 min they show shift and broadening.…”

Section: Resultsmentioning

confidence: 99%

“…7,10 -13 Relatively little has been published on the non-SERS (nonsurface-enhanced Raman scattering) spectra of pure iron electrodes in single buffer solutions. 1,2,5,6,9,14 In this work we have examined the fundamental reactions occurring at an iron electrode in two different buffer solution types (carbonate and phosphate) under similar conditions. We have succeeded in making semi-quantitative measurements of the relevant potentials and rates of conversion between the initial passivation layer (usually a 'green rust') and the subsequent oxide or phosphate formation.…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic studies of the corrosion of model iron electrodes in carbonate and phosphate buffer solutions

Larroumet

Greenfield

Akid

et al. 2008

J Raman Spectroscopy

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We have extended our unenhanced (non-SERS) Raman spectroscopic investigations to include a study of the corrosion of an iron electrode in carbonate and phosphate buffer solutions. The measurements have been supported by electrochemical investigations (via cyclic voltammetry), enabling oxidation and reduction reactions to be systematically followed at variable applied potentials.In a carbonate buffer (pH = 9.4) the surface oxidation led to the formation of a 'green rust' (a hydrated hydroxy-carbonate), followed by the a-and b-forms of FeOOH and an underlying magnetite layer formed on the cathodic (reduction) cycle.In a phosphate buffer (pH = 7.7) the surface was passivated by hydrated phosphates of iron [identified as FePO 4 · xH 2 O and Fe 3 (PO 4 / 2 ·8H 2 O]. The formation of oxides (Fe 2 O 3 and Fe 3 O 4 ) were inferred from voltammetry, but spectral identification was more difficult because of broad, ill-defined spectra.Despite the challenges of using unenhanced Raman spectroscopy, we believe that the effort was worthwhile, the reactions identified being more likely to be relevant to real electrochemical environments.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectroscopic studies of the corrosion of model iron electrodes in carbonate and phosphate buffer solutions

Larroumet

Greenfield

Akid

et al. 2008

J Raman Spectroscopy

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“…The wave numbers of Raman peaks observed from MS and CP fraction were listed in the Table 1 with those of iron oxide compounds. [16][17][18][19][20] The peak at 662 cm À1 observed in MS and CD fractions ( Fig. 3b and 3e, respectively) was assigned to magnetite by comparing with that of the standard magnetite measured with our system (upper spectrum in Fig.…”

Section: The Raman Spectroscopic Measurementsmentioning

confidence: 89%

Laser Raman Spectroscopic Study on Magnetite Formation in Magnetotactic Bacteria

et al. 2008

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Magnetotactic bacteria have one or more chains of magnetosome, consisting of nano-sized magnetic crystal covered with a phospholipid bilayer and use it to sense the geomagnetic fields. In order to elucidate the molecular process to make magnetosome from the iron compounds found in the bacteria, laser Raman spectroscopic measurements were performed with the magnetotactic bacterium, Magnetospirillum magnetotacticum MS-1 and the fractions separated from it. The major Raman signals at 662 cm À1 and 740 cm À1 were observed. The former was assigned to the Raman signal of magnetite and the latter, to that of ferrihydrite. The Raman signal of ferrihydrite was observed not only in the membrane fraction, but also in the cytoplasmic fraction. Based on the results, the role of ferrihydrite in magnetosome synthesis in the magnetotactic bacteria was discussed.

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“…Due to the complexity of steel corrosion products, normally a combination of analytical techniques including Raman and infrared spectroscopies is commonly used [10,11]. However, a few of works address quantitative analysis.…”

Section: Introductionmentioning

confidence: 99%

Quantitative approach in iron oxides and oxyhydroxides by vibrational analysis

Betancur¹

2012

Opt. Pura Apl.

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A Raman and infrared study of a new carbonate green rust obtained by electrochemical way

Cited by 91 publications

References 16 publications

Spectroscopic studies of the corrosion of model iron electrodes in carbonate and phosphate buffer solutions

Spectroscopic studies of the corrosion of model iron electrodes in carbonate and phosphate buffer solutions

Laser Raman Spectroscopic Study on Magnetite Formation in Magnetotactic Bacteria

Quantitative approach in iron oxides and oxyhydroxides by vibrational analysis

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