Tables for Mössbauer Spectroscopy

Stevens, John G.; Stevens, Virginia E.

doi:10.1007/978-1-4757-5903-7_3

Cited by 14 publications

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“…The presence of γ-Fe 2 O 3 was eliminated because of its thermal instability. As for Fe 3 O 4 , its Mössbauer spectrum at ambient temperature includes two sextets with an isomer shift of δ ≈ 0.27 and 0.67 mm s -1 and different hyperfine fields of ∼490 and ∼460 kG . As no sextet with δ ≈ 0.67 mm s -1 and H ≈ 460 kG (Fe 2+ ) has been observed, we can eliminate the presence of Fe 3 O 4 .…”

Section: Resultsmentioning

confidence: 86%

Oxidation Reduction Behavior of Iron-Bearing Olivines (Fe_xMg_1-_x)₂SiO₄ Used as Catalysts for Biomass Gasification

et al. 2006

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Natural iron-bearing olivines (Fe x Mg 1-x ) 2 SiO 4 have been recognized as one of the most promising tar-cracking catalytic materials for fluidized bed biomass gasification to produce syngas (H 2 + CO). Iron present in the olivine significantly influences its catalytic activity. However, the Fe 0 -active phase cannot be obtained by the reduction of olivine under the catalyst working conditions. A better understanding of olivine's behavior in oxidizing-reducing conditions is crucial for control of its catalytic properties. In this paper, we have demonstrated how the oxidation of iron-bearing olivines leads to the formation of reducible iron oxides dispersed in the iron-depleted olivine matrix. The choice of oxidation-reduction conditions permits us to control the amount of iron extracted from the olivine structure. The mechanism of the oxidation-reduction behavior of a natural olivine has been studied by 57 Fe Mo ¨ssbauer spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and temperature-programmed reduction (TPR).

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Section: Resultsmentioning

confidence: 86%

Oxidation Reduction Behavior of Iron-Bearing Olivines (Fe_xMg_1-_x)₂SiO₄ Used as Catalysts for Biomass Gasification

et al. 2006

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“…The small component observed at 3.7 mm.s -I in sample A (9 Li) corresponds to Sn n in a sulfide environment [11], and shows that a very small portion of tin has not been totally reduced into Sn ~ at this stage of the lithium insertion. Both components observed between 2.0 and 2.3 mm.s -1 in spectra A, B, C can be attributed to Sn ~ i.e.…”

Section: Resultsmentioning

confidence: 88%

Physical investigation of the mechanisms of lithium insertion in sulfides as anode materials for lithium-ion batteries

Dedryvère¹,

Olivier‐Fourcade²,

Jumas³

2000

Ionics

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Abstract. Electrochemical and chemical lithium insertion (via n-butyllithium) were carried out on a family of spinel phases of the CuzS-InzSa-SnS2 system. Electrochemical measurements have revealed great reversible capacities and the possible use of these materials as negative electrodes in lithium-ion batteries, ll9Sn Mrssbauer spectroscopy, 7Li NMR and S K edge EXAFS spectroscopy were carried out to characterize the mechanisms of lithium insertion. This study has shown the formation of lithium-metal alloys finely dispersed in an amorphous lithium sulfide matrix at low potentials. A model is proposed to explain the great capacities observed in these materials.

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“…15 The spectrum of the sample reduced in the field of 60 Oe is shown in Fig. 5a where two more sextets are visible, the parameters of which (the hyperfine magnetic fields 4884 and 4569 kOe) characterize the magnetite 16 remaining due to incomplete reduction. Besides there is a small doublet component (2%) corresponding to wustite.…”

Section: Resultsmentioning

confidence: 99%

The influence of an external magnetic field on the dynamics of magnetite reduction with hydrogen

et al. 2021

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Tables for Mössbauer Spectroscopy

Cited by 14 publications

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Oxidation Reduction Behavior of Iron-Bearing Olivines (Fe_xMg_1-_x)₂SiO₄ Used as Catalysts for Biomass Gasification

Oxidation Reduction Behavior of Iron-Bearing Olivines (Fe_xMg_1-_x)₂SiO₄ Used as Catalysts for Biomass Gasification

Physical investigation of the mechanisms of lithium insertion in sulfides as anode materials for lithium-ion batteries

The influence of an external magnetic field on the dynamics of magnetite reduction with hydrogen

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Tables for Mössbauer Spectroscopy

Cited by 14 publications

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Oxidation Reduction Behavior of Iron-Bearing Olivines (FexMg1-x)2SiO4 Used as Catalysts for Biomass Gasification

Oxidation Reduction Behavior of Iron-Bearing Olivines (FexMg1-x)2SiO4 Used as Catalysts for Biomass Gasification

Physical investigation of the mechanisms of lithium insertion in sulfides as anode materials for lithium-ion batteries

The influence of an external magnetic field on the dynamics of magnetite reduction with hydrogen

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Oxidation Reduction Behavior of Iron-Bearing Olivines (Fe_xMg_1-_x)₂SiO₄ Used as Catalysts for Biomass Gasification

Oxidation Reduction Behavior of Iron-Bearing Olivines (Fe_xMg_1-_x)₂SiO₄ Used as Catalysts for Biomass Gasification