Journal ArticleDOI
Mössbauer Study of Oxidized Iron Silicate Minerals
TLDR
In this article, the ordering of iron in biotites is discussed, and the ferrous-ferric iron ratio in all the silicates is determined in all silicates.Abstract:
Biotites and Ca-amphiboles have been studied. Certain changes in composition of the Ca-amphiboles could be correlated to changes in the Mossbauer parameters. The ordering of iron in biotites is discussed. The ferrous-ferric iron ratio could be determined in all the silicates.
Biotite und Ca-Amphibole wurden untersucht. Die Unterschiede in der chemischen Zusammensetzung konnten mit den Veranderungen der Mossbauer-Parameter korreliert werden. Die Anordnung des Eisens in den Biotiten wird diskutiert. Das Ferro-Ferri-Verhaltnis wurde in allen Silikaten bestimmt.read more
Citations
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Journal ArticleDOI
Mossbauer characteristics of Cambrian glauconite, central U.S.A.
TL;DR: Mossbauer characteristics of 57Fe nuclei in 8 samples of mineral glauconite of Cambrian age and one sample of Cretaceous age (slightly disordered) were obtained at temperatures between 50 and 295 K to evaluate the site occupation of iron in the octahedral sheet.
Journal ArticleDOI
Mössbauer spectra of iron in ceramics and their relation to pottery colours
J. Hess,I. Perlman +1 more
TL;DR: In this article, the chemical states of iron in a few selected clays and ceramics have been ascertained employing the technique of Mossbauer absorption, and the effects upon the iron in firing the clays under different conditions have also been measured.
Journal ArticleDOI
A reassignment of the optical absorption bands in biotites
W. Kliem,Gerhard Lehmann +1 more
TL;DR: In this article, the electronic absorption spectra of three biotites with largely differing Fe2+/Fe3+ ratios were studied before and after thermal dehydration and oxidation of divalent iron.
Journal ArticleDOI
Electric field gradient in biotite mica
R. Chandra,S. Lokanathan +1 more
TL;DR: In this paper, the angular variation of the quadrupole doublet ratio for the two resolved sites in biotite single crystals is studied by Mossbauer absorption and it is shown that this angular variation is consistent with the assumption that the EFG principal Z-axis for the prominent M2 site is distributed on a cone of half angle 20°, the axis lying normal to the layer.
Journal ArticleDOI
Mössbauer spectroscopy of electron irradiated natural layered silicates
TL;DR: Mossbauer spectroscopy was used to investigate the effects of 2 MeV electron irradiation on single crystal of micas, such as muscovite, fuchsite, biotite and phlogopite and on talc as mentioned in this paper.
References
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Journal ArticleDOI
Electric-Field Gradient Tensor in Ferrous Compounds
TL;DR: In this paper, the electric field gradient tensor at the iron nucleus in ferrous compounds was investigated and the results of this investigation were then applied to M\"ossbauer results in FeSi${\mathrm{F}}_{6}$\ifmmode\cdot\else\textperiodcentered\fi{}6${0.29} 0.02
Journal ArticleDOI
Applications of the Mössbauer effect to silicate mineralogy—I. Iron silicates of known crystal structure
TL;DR: In this article, a number of silicates of known crystal struc- ture, containing high-spin iron in a range of co-ordination symmetries, were fitted by computer to Lorentzian line shapes and the component peaks in each spectrum were assigned to the various positions in the particular silicate structure.
Journal ArticleDOI
Trioctahedral one‐layer micas. II. Prediction of the structure from composition and cell dimensions
G. Donnay,N. Morimoto,H. Takeda +2 more
Journal ArticleDOI
A Study of Mössbauer Absorption in Iron Silicates
TL;DR: In this article, the authors measured the Mossbauer resonance absorption in various silicates containing iron and found that the observed isomeric shifts were in accordance with the interpretation of Walker and that the analysis of the spectrum of tourmaline was similar to that of biotite.
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