Distribution of cations and vacancies in TaFe1.25Te3 studied by Mossbauer spectroscopy

Article Abstract:

The tellurium sublattice and iron clustering in the pseudo two-dimensional structure of tantalum iron telluride (TaFe1.25Te3) has been studied by 125Te and 57Fe Mossbauer spectroscopy. TaFe1.25Te3 has a rare Ta-Fe bonded network in Ta-Fe-Fe-Te ribbons with the iron atoms placed in two nonequivalent cyrstallographic sites. Results show the relative intensities of several sextet signals due to the magnetic ordering of iron atoms are associated with the partial clustering. Long-range ordering in the tellurium sublattice is governed by two different tellurium sites.

Analysis, Crystals, Crystal structure, Electronic structure, Atomic structure, Ferromagnetic materials, Tellurium

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Interpreting the oxidative catalytic activity in iron-substituted ferrierites using in situ Mossbauer spectroscopy

Article Abstract:

Research was conducted to examine the oxidative catalytic activity in iron-substituted ferrierites. In situ Mossbauer characterization of the two ferrisilicates under different conditions was carried out and further results were included in structural and catalytic characterizations. Based on the comparison of the behavior of samples and additional analysis of data, results indicate that dinuclear Fe(sub lattice)-O-Fe(sub extralattice) centers are present in Fe-FER and that they have a primary role in mild oxidations.

Research, Oxidation-reduction reaction, Oxidation-reduction reactions, Iron, Iron (Metal), Catalysis, Substitution reactions, Mossbauer effect

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