Mössbauer Spectroscopy of Silicate Minerals

Coey, J. M. D.

doi:10.1007/978-1-4899-0462-1_14

Cited by 87 publications

(46 citation statements)

References 143 publications

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“…In the case of a quadrupole doublet, the relative areas (intensities) of the doublet peaks [11], representing the m I = ±3/2 → ±1/2 and the m I = ±1/2 → ±1/2 transition, respectively, will be (20) (21) where θ is the angle between the respective directions of the γ-ray and the main axis of the EFG at the nucleus. (The peak areas are normed again so that their sum yields 1 for a complete two-peak pattern.…”

Section: ∆ ∆mentioning

confidence: 99%

“…Now, by the help of the induced pattern, the analytical problem can be solved more easily. The standard pattern of omphacite [21]. A more detailed discussion of omphacite will be given in Section 3.1 in connection with Fig.…”

Section: Fig 10amentioning

confidence: 99%

“…In the earliest study [41], the ferrous subspectra were attributed to different crystallographic sites, which site assignment is in contradiction with the X-ray results. Namely, the iron atoms occupy the M1 site in the structure [21]. Thus, the three ferrous doublets were correctly associated with iron atoms at the M1 site having different configurations of Ca 2+ and Na + ions in the more spacious three neighboring M2 sites [42].…”

Section: Neighbor Effectsmentioning

confidence: 99%

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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

120

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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: ∆ ∆mentioning

confidence: 99%

Section: Fig 10amentioning

confidence: 99%

Section: Neighbor Effectsmentioning

confidence: 99%

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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

120

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“…M6ssbauer spectroscopy studies of Fe-rich clays have been performed by several authors (e.g. Coey, 1984). The spectra generally consist essentially of two overlapping quadrupole doublets assigned to Fe 3+ ions in octahedral sites.…”

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confidence: 99%

“…However, recently Luca (1991) studied Ca-exchanged and dehydrated nontronite and detected tetrahedrally coordinated Fe based on MOssbauer spectra. Despite the persistence of some controversy concerning the fitting of the spectra and the attribution of the subspectra to different sites, MOssbauer spectroscopy has been proven to be useful in studying Fe-bearing minerals (Coey, 1984).…”

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confidence: 99%

Iron in Hydrothermal Clays from the Galapagos Spreading Centre Mounds: Consequences for the Clay Transition Mechanism

Buatier¹,

Ouyang

Sanchez

1993

Clay miner.

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Glauconite and Fe-smectite, which can be distinguished by their peculiar morphology and stacking sequences, coexist in the Galapagos Spreading Centre hydrothermal mounds. Analytical electron microscopy (AEM) data suggest that Fe is entirely in octahedral sites in Fe-smectite whereas glauconite is K-rich with Fe in tetrahedral and octahedral sites, However, the MOssbauer spectra, recorded at various temperatures for samples containing both smectite and glauconite, were satisfactorily analysed with three overlapping doublets corresponding to Fe in octahedral sites. The contradictory results obtained with the two methods are explained by the presence of small particles of iron oxide intimately associated with glauconite. These particles were detected in M6ssbauer spectra obtained at 77 K and 4-2 K and were observed by transmission electron microscopy. Iron oxide is a secondary phase formed by alteration of smectite. These data are in good agreement with the hypothesis that the smectite-glauconite reaction, which occurs at 30 m and low temperature in the Galapagos hydrothermal mounds, is a dissolution-precipitation process, dissolution of Fe-rich smectite being followed by precipitation of glauconite and iron oxides.Green clays of hydrothermal origin have been reported in many oceans Thompson et al., 1985;Singer et al., 1984). These deposits are generally found near mid-ocean ridges. They consist principally of Fe-rich clays and their formation is explained by advection of, and precipitation from, low-temperature hydrothermal fluids that circulate through the oceanic crust. In the Galapagos Spreading Centre (GSC), green clay deposits are located at 20 km on the south flank of the ridge and are intercalated with pelagic calcareous sediments (Fig. 1). They form mounds approximatley 30 m high. Their mechanism of formation has been studied using several approaches. The most recent study (Buatier et al., 1989) utilized transmission electron microscopy (TEM) and showed that a transition from smectite to a mica-like mineral occurs at approximately 30 m below the sea water-sediment interface. However, the compositions of these clay minerals and therefore the nature of the chemical reaction which takes place during early diagenesis are still unknown. The aim of the present study is to characterize precisely the minerals of these hydrothermal deposits in order to understand the chemical exchange that occurs at the phase transition. Analytical electron microscopy (AEM) and M6ssbauer spectroscopy were used to characterize the chemical compositions of the clay minerals and thus to determine the valence and sites for Fe in the clay structure. The chemical data were interpreted on the basis of structural data obtained using selected area electron diffraction (SAED) and oblique texture diffraction (OTED) on the same sample.9 1993 The Mineralogical Society

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Firing Techniques of the Impasti from the Protohistoric Site of Concordia Sagittaria (Venice)

Bertelle

Calogero

Leotta

et al. 2001

Journal of Archaeological Science

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Mössbauer Spectroscopy of Silicate Minerals

Cited by 87 publications

References 143 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)

Iron in Hydrothermal Clays from the Galapagos Spreading Centre Mounds: Consequences for the Clay Transition Mechanism

Firing Techniques of the Impasti from the Protohistoric Site of Concordia Sagittaria (Venice)

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