Questions relating to the stable functioning and restoration of soil-vegetation systems in zones with increased aridity are considered. New methodological possibilities of mathematical models in the form of ordinary differential equation systems and a calculating experiment are demonstrated.
Mössbauer spectra of δ‐FeOOH are obtained at 23°C after heating in air in the range 80 to 600°C. The spectra were run with external magnetic fields of H0 = 20 kOe and H0 = 0. From a comparison of the spectra the formation of the intermediate phase δ‐Fe2O3 after heating at 125 to 200°C seems to be followed by an increase of the quantity of defects and an equilibration of the sublattice population. A collinear ferromagnetic structure, but not canted as in ordinary hematite, is shown to grow in the initial stages of hematite formation (after heating at 225°C).
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