57Fe Mossbauer

Fe Mossbauer study of iron distribution in zeolite A during zeolite crystallization process 

Fig. 11 57Fe Mossbauer spectra of (bt, S) recorded at 4.2 K in zero-field before irradiation (a), immediately after irradiation (b), 6 days (c) and 11 days (d) after irradiation. Mossbauer subspectra correspond to HS species (grey), LS species (dark grey)

Figure 2 57Fe Mossbauer spectrum for a poly(w-carborane-siloxane).

Keywords Fe-exchanged zeolite A, 57Fe Mossbauer spectroscopy, hydrothermal crystallization 

Properties of FeCr,o solid samples have been studied by X-ray diffraction, 57Fe Mossbauer spectroscopy and magnetic measurements to stimulate the interaction of Fe with fullerene. FeCr,o samples have been prepared by decomposition of the 1,3-dipolar cycloadduct of the fullerene and ferrocene nitrile oxide. The components exhibit super paramagnetic properties originating from an interaction between FeCr,o complexes within the nano-particles. Each nano-particle consists of hundreds to thousands complexes (546). 

It has been postulated that the origin of the two different high-spin Fe(II) doublets observed in the 57Fe Mossbauer spectra may be that a small fraction (about 6%) of the Fe(II) ions experience a different local environment, most likely in the distribution of the non-coordinating solvent and anion molecules, from that of the majority of the high-spin Fe(II) ions. 

The samples were characterized by using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, 57Fe Mossbauer spectroscopy [2] and Rutherford backscattering spectrometry (RBS). 

Most interestingly, [Fe(btzp)3](Cl04)2 is the first one-dimensional Fe(II) spin crossover compound, which shows the LIESST effect, detected in this instance by 57Fe Mossbauer spectroscopy (Fig. 19). 

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