Iron species are the most common impurities in glasses, therefore their effect on structure and properties of various glasses has long been of great scientific interest. Iron in glass is usually present in its Fe 3+ and/or Fe 2+ states as a result of the equilibrium established in the melt during synthesis. 1 Both of these types of iron ions can occupy sites with different oxygen coordination, which leads to different structural roles of iron ions in the glass network (network former and modifier), hence should affect the structure, crystallization and phase separation processes, which by-turn should influence the physical and chemical properties of the resulting glasses. The effect iron has on properties and structure also depends upon the base glass composition. The more complex the system is, the more ambiguous the iron's influence is. For example, borosilicate (BS) glasses have two glass-formers, hence combine their unique properties. One of the most studied BS systems is the sodium borosilicate (NBS) system. NBS glasses are approved in USA, France, UK, and other
Theoretical modeling of the magnetic properties of Fe3O4-Fe3-xTixO4 composites obtained by the sol-gel method with subsequent hydrothermal treatment has been carried out. The magnetization reversal fields and the number of particles in different magnetic states of an ensemble of two-phase particles with an infinitely thin boundary between the phases and a characteristic size varying in the range from 30 to 80 nm were calculated using the "magnetic rectangles" method. Hysteresis characteristics of an ensemble of chemically inhomogeneous magnetostatically interacting particles were obtained, consistent with experimental data. Keywords: Composites, magnetic granulometry, micromagnetism, two-phase particles, magnetostatic interaction.
In this work, the materials of FemOn – Fe3-xTixO4 composition have been obtained using the sol-gel method and hydrothermal treatment. The synthesis conditions favor the formation of composites containing titanomagnetite in a rather low concentration. Based on the hysteresis curves and temperature dependences of the remanent magnetization, theoretical analysis of the composites magnetic properties has been carried out using a model of clustered two-phase particles bound with magnetostatic interaction.
Theoretical modeling of the magnetic properties of Fe3O4-Fe3-xTixO4 composites obtained by the sol-gel method with subsequent hydrothermal treatment has been carried out. The magnetization reversal fields and the number of particles in different magnetic states of an ensemble of two-phase particles with an infinitely thin boundary between the phases and a characteristic size varying in the range from 30 to 80 nm were calculated using the "magnetic rectangles" method. Hysteresis characteristics of an ensemble of chemically inhomogeneous magnetostatically interacting particles were obtained, consistent with experimental data.
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