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- W2034304463 abstract "The use of spectroscopic methods permits in certain cases to investigate the relative distribution of cations and anions in silicate structures. In particular, in micas (phyllosilicates 2:1) with very heterogeneous composition, the use of multinuclear (29Si, 27Al, 1H and 19F) NMR spectroscopy has demonstrated the existence of local ordering in both the tetrahedral and octahedral sheets. From the study of NMR spectra associated to OH− and F− ions we have concluded that: a) the Fe+2 ions have not any preference to occupy M1 or M2 sites in the octahedral sheet of micas, b) the F− ions are located in homogeneous domains composed only by F− and Mg+2 ions, and c) the Fe+2 are in close association with OH− ions. As the content in Fe+2 and F− increases Fe+2 ions have a net tendency to cluster around the OH groups. The analysis of 29Si and 27Al NMR spectra showed that in the tetrahedral sheet of micas: a) each Al is surrounded by 3Si, and b) Si, Al distribution is more dispersed that imposed by Loewenstein's rule." @default.
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- W2034304463 date "1986-03-01" @default.
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- W2034304463 title "Distribution of isomorphous substitutions in silicates by NMR spectroscopy" @default.
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- W2034304463 doi "https://doi.org/10.1016/0022-2860(86)80333-7" @default.
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