High temperature transformation of Fe-bearing minerals in bentonite – Mössbauer spectroscopy studies
نویسندگان
چکیده
منابع مشابه
Preliminary results of 57 Fe Mössbauer spectroscopy of metamict samarskite after one - hour high temperature annealing in argon Dariusz Malczewski
Metamict minerals are a class of natural amorphous minerals that were initially crystalline. These minerals contain radioactive elements that degrade their crystal structure mainly by recoil nuclei from -decays of 238U, 232Th, 235U and their daughter products. Because of the natural occurrence of uranium and thorium, they can serve as analogs for radiation effects in high level nuclear waste [...
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Mössbauer spectroscopy is an indispensable spectroscopic technique and analytical tool in iron coordination chemistry. The linear correlation between the electron density at the nucleus ("contact density") and experimental isomer shifts has been used to link calculated contact densities to experimental isomer shifts. Here we have investigated relativistic methods of systematically increasing so...
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A new method of performing Mössbauer spectroscopy with synchrotron radiation is demonstrated that involves using a high-speed periodic shutter near the focal spot of a microfocused X-ray beam. This fast microshuttering technique operates without a high-resolution monochromator and has the potential to produce much higher signal rates. It also offers orders of magnitude more suppression of unwan...
متن کاملSpectroscopic evidence for interfacial Fe(II)-Fe(III) electron transfer in a clay mineral.
Interfacial electron transfer has been shown to occur between sorbed Fe(II) and structural Fe(III) in Fe oxides, but it is unknown whether a similar reaction occurs between sorbed Fe(II) and Fe(III)-bearing clay minerals. Here, we used the isotopic specificity of (57)Fe Mössbauer spectroscopy to demonstrate electron transfer between sorbed Fe(II) and structural Fe(III) in an Fe-bearing smectite...
متن کامل182tungsten Mössbauer spectroscopy of heteropolytungstates.
The tungsten-182 Mössbauer spectra of a series of Keggin structure heteropolytungstates, [EW12O40]n- are reported. There is a very considerable variation in quadrupole coupling at the tungsten nucleus indicating considerable asymmetry in the electron distribution for the more electronegative elements E. The quadrupole coupling correlates well with the structural data, in particular with the dis...
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ژورنال
عنوان ژورنال: Metal ...
سال: 2022
ISSN: ['2694-9296']
DOI: https://doi.org/10.37904/metal.2022.4388