Applications of 57Fe Mossbauer Spectrometry

From the obtained data, it was possible to conclude that iron found in the natural zeolite is high-spin Fe3+ in place of Al3+ in the framework tetrahedral sites. Besides, Fe3+ is located in extraframework octahedral sites as Fe(H20)6+. Finally, Fe2+ is present in the octahedral coordination in extra-framework sites or in other aluminosilicates present in the zeolite rock [44], 

FIGURE 4.63 57Fe Mossbauer spectra transmission [%] vs. velocity [mm/s] of natural zeolite rock samples (a) MP, (b) C2, (c) Cl, and (d) C4. 

These samples were previously studied with the help of MAS-NMR (see Section 4.6.6). It was shown that at the beginning of the hydrothermal transformation, the spectrum consists of a single, 

The Physical Chemistry of Materials Energy and Environmental Applications 

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