Journal ArticleDOI
Analysis of Mössbauer spectra of silicate glasses using a two-dimensional Gaussian distribution of hyperfine parameters
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TLDR
In this paper, a two-dimensional Gaussian distribution of isomer shift and quadrupole splitting was proposed to evaluate the hyperfine parameter distribution in Mossbauer spectra of silicate glasses.Abstract:
A new method is proposed to evaluate the hyperfine parameter distribution in Mossbauer spectra of silicate glasses. The method assumes a distribution of isomer shift and quadrupole splitting with a two-dimensional Gaussian shape. Application of the method to Mossbauer spectra of CaOSiO2FeO glasses containing different redox ratios, Fe3+/Fe2+, is discussed. It is shown that the two-dimensional Gaussian distribution method leads to a very good description of the data with a relatively small number of free parameters.read more
Citations
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Journal ArticleDOI
The Oxidation State of Fe in MORB Glasses and the Oxygen Fugacity of the Upper Mantle
TL;DR: In this paper, the authors show that global MORBs yield average Fe{sup 3+}/{Sigma}Fe ratios of 0.16 {+-} 0.01 (n = 103), which trace back to primary MORB melts equilibrated at the conditions of the QFM buffer.
Journal ArticleDOI
Magma redox and structural controls on iron isotope variations in Earth's mantle and crust
Nicolas Dauphas,Mathieu Roskosz,Esen E. Alp,Daniel R. Neuville,Michael Y. Hu,Corliss Kin I Sio,François L. H. Tissot,Jiyong Zhao,Laurent Tissandier,Etienne Médard,Catherine Cordier +10 more
TL;DR: In this paper, the mean force constants of iron bonds in silicate glasses were measured by synchrotron Nuclear Resonant Inelastic X-ray Scattering (NRIXS).
Journal ArticleDOI
Determination of the iron oxidation state in basaltic glasses using XANES at the K-edge
TL;DR: In this paper, the pre-edge X-ray absorption near edge structure (XANES) and Mossbauer spectra were collected on synthetic glasses of basaltic composition and of glasses on the sodium oxide-silica binary to establish a relation between the preedge of the XANES at the K-edge and the Fe oxidation state of depolymerised glasses.
Journal ArticleDOI
High-precision determination of iron oxidation state in silicate glasses using XANES
TL;DR: In this article, a second-order polynomial model was proposed for the correlation between the centroid and Fe3+/∑Fe, yielding a precision of ± 0.0045.
Journal ArticleDOI
The effect of water activity on the oxidation and structural state of Fe in a ferro-basaltic melt
TL;DR: In this paper, the effect of H2O activity on the oxidation and structural state of Fe in an iron-rich basaltic melt was investigated at T = 1200°C, P = 200 MPa and fH2 corresponding to H 2O-MnO-mn3O4 and H 2 O-QFM redox buffers.
References
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Handbook of Mathematical Functions
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Data Reduction and Error Analysis for the Physical Sciences
TL;DR: In this paper, Monte Carlo techniques are used to fit dependent and independent variables least squares fit to a polynomial least-squares fit to an arbitrary function fitting composite peaks direct application of the maximum likelihood.
Journal ArticleDOI
Data Reduction and Error Analysis for the Physical Sciences.
TL;DR: Numerical methods matrices graphs and tables histograms and graphs computer routines in Pascal and Monte Carlo techniques dependent and independent variables least-squares fit to a polynomial least-square fit to an arbitrary function fitting composite peaks direct application of the maximum likelihood.
Book
Structure and Properties of Silicate Melts
TL;DR: In this paper, the authors present a model for the phase equilibria of iron and melt polymerization. But they do not consider the role of iron-bearing silicate melts.
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