To study the structure of iron in kaolinites and metakaolinites, geopolyme To study the structure of iron in kaolinites and metakaolinites, geopolymeric most important precursor materials, natural red kaolins with naturally occurring structural iron and white kaolinite doped through iron incorporation reactions in alkaline environments. In the calcination process the emergence of hematite due to burning of non-structural iron along with the amorphous phase is observed. White kaolinite doped with iron showed only a doublet with quadrupole splitting slightly above those obtained in the red kaolin before burning. Burning resulted in the transformation of a fraction of kaolinite in metakaolinite with consequent distortion of the octahedral sites. It is also observed the appearance of hematite due to the existence of iron not incorporated into the clay structure.
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Clicking on the donut icon will load a page at altmetric. Find more information on the Altmetric Attention Score and how the score is calculated. Develops the theory and characteristics of Mossbauer spectroscopy. Cite this: J. Article Views Altmetric -. Citations PDF 6 MB. Abstract Develops the theory and characteristics of Mossbauer spectroscopy. Cited By. This article is cited by 23 publications.
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Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Show full item record. Gouveia, Daniel Xavier. Fortaleza, In the Mg-Fe system, the destruction of the layered structure took place at about oC. The broad peaks observed in the X ray diffractograms suggests that the resultant oxides constitute a solid solution.
Laboratório de Espectroscopia Mössbauer
The consequent nuclear spectroscopy method is exquisitely sensitive to small changes in the chemical environment of certain nuclei. Typically, three types of nuclear interactions may be observed: the isomer shift due to differences in nearby electron densities also called the chemical shift in older literature , quadrupole splitting due to atomic-scale electric field gradients; and magnetic Zeeman splitting due to non-nuclear magnetic fields. It is a method completely unrelated to nuclear magnetic resonance spectroscopy. Just as a gun recoils when a bullet is fired, conservation of momentum requires a nucleus such as in a gas to recoil during emission or absorption of a gamma ray. If a nucleus at rest emits a gamma ray, the energy of the gamma ray is slightly less than the natural energy of the transition, but in order for a nucleus at rest to absorb a gamma ray, the gamma ray's energy must be slightly greater than the natural energy, because in both cases energy is lost to recoil.
These metrics are regularly updated to reflect usage leading up to the last few days. Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts. The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.