Hyperfine Splitting of Fe57 and Mg-Fe Order-Disorder in Orthopyroxenes (MgSiO3-FeSiO3 Solid Solution)
| Autor: | Billy J. Evans, Subrata Ghose, Stefan Hafner |
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| Rok vydání: | 1967 |
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| Zdroj: | The Journal of Geology. 75:306-322 |
| ISSN: | 1537-5269 0022-1376 |
| DOI: | 10.1086/627257 |
| Popis: | The apparent "two-line" hyperfine spectrum of Fe57 in some orthopyroxene minerals from metamorphic rocks has been analyzed by the Mossbauer technique. The spectrum consists predominantly of two overlapping two-line patterns. The patterns have been assigned to the two non-equivalent Fe2+ sites, M1 and M2, of the crystal structure. The approximated intrinsic values of the electric quadrupole interaction \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage{wasysym} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document}$$\frac{1}{2} |e^{2}qQ| (1 + [\eta^{2}/3])^{1/2}$$\end{document} and isomer shifts at M1 and M2 are: The Fe2+ site occupancies have been approximately determined. The high degree of Mg-Fe ordering in an orthopyroxene (Fe/[Mg + Fe] = 0.535) found previously by X-ray diffraction has b... |
| Databáze: | OpenAIRE |
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