The use of m�ssbauer spectroscopy of iron in clay mineralogy

Heller-Kallai, L.; Rozenson, I.

doi:10.1007/bf00311893

Cited by 174 publications

(74 citation statements)

References 65 publications

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“…19). Site assignment can also be supported by the theoretical calculation of quadrupole splitting involving the estimation of the electric field gradient [13,33,34,36]. Another example for overlapping peaks is shown in Fig.…”

Section: Patterns With Overlapping Peaksmentioning

confidence: 94%

“…22. The contour of the normalized Mössbauer spectrum can be expressed by the transmission integral: (33) where b is the background fraction of photons behind the absorber (i.e., the fraction of photons that do not originate from the Mössbauer transition). The area of the normalized spectrum is:…”

Section: Quantitative Analysismentioning

confidence: 99%

“…Figure 14 shows the correlation between the coordination number and the isomer shift/quadrupole splitting of iron in different compounds. Site distortion from either octahedral or tetrahedral sym- metry can also be determined [13,33,34]. Iron in tetrahedral coordination can be distinguished from that in octahedral coordination on the basis of its lower isomer shift, which reflects higher covalency.…”

Section: Qualitative Analysismentioning

confidence: 99%

“…Several studies have dealt with the comparison of the Fe 2+ /Fe 3+ ratios obtained by Mössbauer spectroscopy and by wet chemical analysis [33,46]. Generally, the results correlate well for sheet silicates [46], but the mentioned factors influence the correlation.…”

Section: = =mentioning

confidence: 99%

See 3 more Smart Citations

Critical review of analytical applications of Mössbauer spectroscopy illustrated by mineralogical and geological examples (IUPAC Technical Report)

Кузманн¹,

Nagy²,

Vértes³

2003

Pure and Applied Chemistry

122

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We have developed a new terminology for Mössbauer pattern analysis in order to enhance the performance of qualitative analysis by Mössbauer spectroscopy. In this approach, Mössbauer parameters are considered as a function of a number of externally adjusted experimental parameters at which the spectrum has been recorded. The basis of analytical classification is the microenvironment, which is determined by an assembly of atoms causing the same hyperfine interactions at one particular class of the Mössbauer probe atoms.Since Mössbauer spectroscopy measures hyperfine interactions very sensitively, the microenvironment presents itself as a fundamental concept for analytical purposes. Our approach can also help to systematize the Mössbauer data for the identification of individual physicochemical species from the corresponding patterns present in the spectrum.

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Section: Patterns With Overlapping Peaksmentioning

confidence: 94%

Section: Quantitative Analysismentioning

confidence: 99%

Section: Qualitative Analysismentioning

confidence: 99%

Section: = =mentioning

confidence: 99%

See 2 more Smart Citations

Critical review of analytical applications of Mössbauer spectroscopy illustrated by mineralogical and geological examples (IUPAC Technical Report)

Кузманн¹,

Nagy²,

Vértes³

2003

Pure and Applied Chemistry

122

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“…The exchange of the interlayer cations of montmorillonite with the ions of rare earth elements is an effective approach to obtain catalysts, catalyst supports, sensors and adsorbents [4][5][6]. Mössbauer spectroscopy has been widely applied [7][8][9] to study the microenvironments of iron atoms occurring in montmorillonite. The 57 Fe Mössbauer spectra of montmorillonites generally show a paramagnetic broadened Fe 3+ component and, in some cases, a minor Fe 2+ resonance.…”

Section: Introductionmentioning

confidence: 99%

Magnetic sublattices in Np2Co17 and Np2Ni17

et al. 2016

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Novel montmorillonites were prepared by the exchange of the interlayer cations with a series of rare earth cations (La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, and Er) and characterized by XRD, XRF, SEM, chemical analysis and 57 Fe Mössbauer spectroscopy. An unexpected magnetically split component, assigned to iron being in the interlayer space, was observed in the Mössbauer spectra at 78K in some rare earth cation exchanged montmorillonite. This paper is the initial report about this observation. The transition of iron from the octahedral site to the interlayer and possible incorporation of rare earths in sites different from those which are in the interlayer space was concluded.

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A New Iron‐Based Carbon Monoxide Oxidation Catalyst: Structure–Activity Correlation

2014

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A new iron-based catalyst for carbon monoxide oxidation, as a potential substitute for precious-metal systems, has been prepared by using a facile impregnation method with iron tris-acetylacetonate as a precursor on γ-Al2 O3 . Light-off and full conversion temperatures as low as 235 and 278 °C can be reached. However, the catalytic activity strongly depends on the loading; lower loadings perform better than higher ones. The different activities can be explained by variations of the structures formed. The structures are thoroughly characterized by a multimethodic approach by using X-ray diffraction, Brunauer-Emmett-Teller surface areas, and Mössbauer spectroscopy combined with diffuse reflectance UV/Vis and X-ray absorption spectroscopy. Consequently, isolated tetrahedrally coordinated Fe(3+) centers and phases of AlFeO3 are identified as structural requirements for high activity in the oxidation of carbon monoxide.

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The use of m�ssbauer spectroscopy of iron in clay mineralogy

Cited by 174 publications

References 65 publications

Critical review of analytical applications of Mössbauer spectroscopy illustrated by mineralogical and geological examples (IUPAC Technical Report)

Critical review of analytical applications of Mössbauer spectroscopy illustrated by mineralogical and geological examples (IUPAC Technical Report)

Magnetic sublattices in Np2Co17 and Np2Ni17

A New Iron‐Based Carbon Monoxide Oxidation Catalyst: Structure–Activity Correlation

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