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Kiseleva T. Yu. Uyangaa E. Kostenko O. V. Tyapkin P. Yu. Ivanenko I. P. Zholudev S. I. Markov G. P. Devyatkina E. T. Jargalan N. Grigorieva T. F. Sangaa D. Ilyushin A. S. 《Journal of Structural Chemistry》2022,63(1):26-36
Journal of Structural Chemistry - Scanning electron microscopy, X-ray diffraction, Raman and Mössbauer spectroscopies, field and temperature dependences of magnetic saturation and... 相似文献
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A. M. Balagurov I. A. Bobrikov M. S. Maschenko D. Sangaa V. G. Simkin 《Crystallography Reports》2013,58(5):710-717
A structural transition with a reduction in symmetry of the high temperature cubic phase (sp. gr. Fd3m) to the tetragonal phase (sp. gr. I41/amd) and the appearance of a ferrimagnetic structure occur in CuFe2O4 copper ferrite at T ≈ 440°C. It is established by an experiment on a high-resolution neutron diffractometer that the temperature at which long-range magnetic order occurs is higher than that of tetragonal phase formation. When cooling CuFe2O4 spinel from 500°C, the equilibrium coexistence of both phases is observed in a fairly wide temperature range (~40°C). The composition studied is a completely inverse spinel in the cubic phase, and in the tetragonal phase the inversion parameter does not exceed few percent (x = 0.06 ± 0.04). At the same time, the phase formed upon cooling has a classical value of tetragonal distortion (γ ≈ 1.06). The character of temperature changes in the structural parameters during the transition from cubic to tetragonal phase indicates that this transition is based on the Jahn-Teller distortion of (Cu,Fe)O6 octahedra rather than the mutual migration of copper and iron atoms. 相似文献
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T. V. Tropin N. Jargalan M. V. Avdeev O. A. Kyzyma D. Sangaa V. L. Aksenov 《Physics of the Solid State》2014,56(1):148-151
The aggregate growth in a C60/N-methylpyrrolidone (NMP) solution has been considered in the framework of the approach developed earlier for describing the cluster growth kinetics in fullerene polar solutions. The final cluster size distribution functions in model solutions have been estimated for two fullerene aggregation models including the influence of complex formation on the cluster growth using extrapolations of the characteristics of the cluster state and distribution parameters. Based on the obtained results, the model curves of small-angle neutron scattering have been calculated for a C60/NMP solution at various values of the model parameters. 相似文献
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