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The La0.88Sr0.2Mn(1−y)Fey0(3±δ, i (LSMF with y = 0, 0.2, 0.5, 0.8, 1) compounds are prospective cathode materials for advanced solid oxide fuel cells (SOFC) application operating at 700° C. Usual analysis methods like thermogravimetric analysis or redox titration enable to determine the average oxidation state of both manganese and iron cations. The comparative role of iron and manganese in B-site...
Manganese-doped γ-Fe2O3 has been prepared by precipitation techniques and shown by Mn K-edge XANES and EXAFS to contain Mn3+ in the octahedral sites of the spinel-related structure. The 57Fe Mössbauer spectra recorded in situ between 295 and 750 K show that conversion of the spinel-related γ-Fe2O3 -to the corundum-related α-Fe2O3-structure occurs at ca. 700 and 730 K in the samples containing ca....
Cs2[AuIX2][AuIIIX4] (X = Cl, Br, I) is known for a perovskite-type gold mixed-valence system. We have synthesized new gold mixed valence complexes, Cs2[AuIX2][AuIIIX4] (X, Y = Cl, Br, I), which was proved by means of Raman spectroscopy. From the analysis of 197Au Mössbauer spectra, it was elucidated that the charge transfer between % MathType!MTEF!2!1!+- % feaagCart1ev2aaatCvAUfKttLearuavP1wzZbItLDhis9wBH5garm...
The quasi two-dimensional antiferromagnetic compound TlCo2Se2 has been studied by 57Fe Mössbauer spectroscopy. Small single crystals have been made with 2% Fe doping. The Mössbauer spectrum, developed below the Néel temperature of 85 K, reveals a distribution of magnetic hyperfine fields (MHF). The fit is reasonably good if we suppose a connection between the values and mutual orientation of the EFG...
57Fe Mössbauer spectroscopy was used to study the double perovskite GdBaFe2O5+w, which exhibits mixing of the integer valence states of iron. The valence mixing/separation process Fe2+ + Fe3+ ↔ 2Fe2.5+ was investigated as a function of temperature. For nearly stoichiometric compositions of w ≈ 0, a two-step Verwey-type transition is registered that separates Fe2.5+ into intermediate...
Changes in 119Sn and 121Sb Mössbauer spectra due to lithium insertion in tin and antimony based anode materials for lithium-ion batteries are analysed. Due to the complexity of the spectra linear augmented plane wave calculations of the electronic density were used to evaluate the electron density and the electric field gradients at the nucleus. The 119Sn Mössbauer spectrum of SnO + 3.5 Li was evaluated...
Perovskite-related phases of the type LaFe1−xCoxO3 (x = 0 and 0.5) have been synthesised by milling techniques. The materials are of smaller particle size and more susceptible to reduction in a flowing hydrogen/nitrogen gas mixture than their counterparts made by conventional solid state calcination methods. The presence of cobalt enhances the reducibility of iron...
A series of pure polycrystalline M-type hexagonal ferrite with the formula BaCo0.5xZn0.5xTixFe12−2xO19 (x = 0.0, 0.4, 0.8, 1.2, 1.6, 2.0) has been synthesized and studied by X-ray diffraction and Mössbauer spectroscopy. With increasing substitution the Mössbauer spectra change from magnetically ordered (x = 0) towards magnetically ordered with...
The Mössbauer community all over the world was given the opportunity to determine the Fe(II)/Fe(III) ratio in 4 glass samples of different total iron content, to classify themselves with respect to their measurement technique and especially to their kind of evaluation.
57Fe Mössbauer spectroscopy was carried out to know the electronic states of the assembled iron complexes. The IS value revealed a high-spin FeII state in the bipyridine and pyrazine iron complexes with NCS or NCSe. The dissociation behavior of ligand was investigated by TG, and the resultant change in the coordination sphere around iron atom was reflected in the change in QS value.
We have examined the 155Gd Mössbauer spectra at 12 K for 25 complexes having different coordination numbers and different ratios of coordinating oxygen to nitrogen atoms. The isomer shift decreases in the order: GdO10 ≈ GdO9 > GdN2O7≥ GdO8 ≈ GdN6O2 ≥ GdO7 ≥ GdO6 > GdN8 ≈ GdN9. The s electron density at the nucleus is larger as the coordination number decreases and as the coordinating atoms change...
The mixed-metal cluster compound (PPh4)[Fe2Ir2(CO)12{µ3-Au(PPh3)}], which has a trigonal bipyramidal core consisting of five atoms of three different Mössbauer isotopes, was studied by 193Ir, 197Au and 57Fe Mössbauer spectroscopy. The nature and the chemical character of the atoms located at the different sites are discussed with respect to their Mössbauer spectra.
The pentadentate ligand 3-EO-5LH2 = 3-ethoxy-saldptn = N,N′-bis(3-ethoxy-1-hydroxy-2-benzyliden)-1,7-diamino-4-azaheptane has been prepared by a Schiff base condensation between 1,7-diamino-4-azaheptane and the corresponding 3-ethoxy-salicyaldehyde. 3-EO-5LH2 is a sterical extention to 5LH2. Its complexation with Fe(III) gave the high-spin (S = 5/2) complex of [Fe(III)(3-EO-5L)Cl]. This precursor...
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