Solvothermal Synthesis, Crystal Structure, Thermal Stability, and Moessbauer Spectroscopic Investigation of the Mixed‐Valent Thioantimonate(III,V) [Ni(dien)2]2Sb4S9.
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Thermal Stability
Solvothermal synthesis
Oxidation state
Spin states
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Iron in MgFeCrO4 and MgFe0.6Cr1.4O4 is expected to be in the Fe3+ charge state. Mossbauer spectroscopy, however, reveals the formation of a significant amount of Fe2+ state. The electric quadrupole interaction as well as the linewidth of the Mossbauer spectrum of Fe2+ show temperature dependences.
Laser linewidth
Quadrupole splitting
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Mossbauer spectroscopy was used to study the oxidation of Fe(OH)2 under high pH conditions with the aim of detecting the formation of Fe(OH)3. The Mossbauer spectral parameters indicated that a small IVFe3+ component was initially present in the Fe(OH)2. The Mossbauer spectra were recorded at 77 K, thus any Fe species in solution would also be observed in the frozen state. The small IVFe3+ component increased progressively with the oxidation of the Fe(OH)2, maximizing with the onset of �-FeOOH formation. As �-FeOOH formation increased, the IVFe3+ component decreased, with �-FeOOH being the final sole phase. It is suggested that the Mossbauer spectral parameters indicate that a component such as Fe(OH)2 may form at high pH values as used in this study. Furthermore, any Fe3+ produced by the initial oxidation of Fe(OH)2 is exsolved from the solid and at the high pH of the surrounding liquid produces Fe(OH)-4 until the formation of the more stable �-FeOOH begins. This suggests Fe(OH)2 could be the building blocks for �-FeOOH in alkaline solution. No apparent Fe(OH)3 phase was observed as anticipated.
Oxidation state
Component (thermodynamics)
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Quadrupole splitting
Europium
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A new type of Mossbauer spectroscopy-time-dependent Mossbauer spectroscopy is
proposed and realized on the basis of using two-step decay ~(119m)Te→~(1)Sb→~~(119)Sn.
For the GaAs samples, implanted with dose of 110keV ~(119m)Te + 10~(15) stable Te/cm2 and annealed at 600℃, the relative intensities of various lines of the Mossbauer spectra have been measured as functions of ξ, a parameter being equal to Φ_(Te)/Φ_(To)+(?)1 by definition ξitself is determined from the annealing time t_i, the initial time t_i and the final time t_f of the measurement of each spectrum. This kind of time-dependent Mossbauer spectroscopy can be used to investigate the change of the environment of the probe atoms in solid. The lines of Mossbauer spectra have been identified. The problem of the environment change of Te atom in GaAs after its decay into Sb and the mechanism of the non-substitutional Te have been discussed. Our experimental results are also compared with previous data taken from Mossbauer spectra of 125Te and 129Te in GaAs.
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To determine whether there is an ionic substitution of Ni, Co, Mn, and Al for Fe in synthetic goethites these materials have been studied by Mossbauer spectroscopy at various temperatures ranging from 77 to 400 K. It is found that the presence of substituting elements in magnetically ordered structure of crystals may change the shape of Mossbauer spectra of these materials. The approximate distribution function of the effective magnetic field in the Fe nucleus p(Hn) is obtained from the Mossbauer spectra. It is noted that the mean value of p(Hn) and its integral width can be taken as a measure of substitution in goethites.
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Recent applications of high pressure Mossbauer spectroscopy using a diamond anvil cell are presented. High pressure Mossbauer studies of two perovskite-related iron oxides SrFeO2.97 and CaFeO3, magnetite Fe3O4, and wustite Fe1−δO have been carried out at 300 K at pressures of up to 74 GPa. A preliminary result by the resonant forward scattering of synchrotron radiation for high pressure Mossbauer spectroscopy using a diamond anvil cell is also presented.
Wüstite
Diamond anvil cell
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Quadrupole splitting
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