Inna Soroka
I am a docent in Materials Chemistry. My field of competence is Materials Science. I did my PhD studies, dedicated to synthesis and characterization magnetic materials, at Uppsala University, Sweden
Location Sweden
Activity
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Inna Soroka made a comment
Magnetic moments of atoms can be aligned in one or another direction (negative M_0 on the graph)
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Ferromagnetism was discovered first on iron. As we know now not only iron possesses such properties.
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Inna Soroka made a comment
Chemical properties of REEs (valence, solubility, reactivity, etc.) are close to each other. Several REEs can constitute one mineral, therefore one needs to find a smart way to separate these elements to be able to use them in magnets. For example, Nd-Fe-B magnets contain not only Nd, as rare earth element, but also small amounts of Dy, Pr and others. Thus,...
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Inna Soroka made a comment
The magnetization curve shows dependence of the internal magnetization (B) of a specific material on the externally applied magnetic field (H). Considering the shape of the magnetization curve it is possible to determine the type of magnetic materials (for ex. dia-, para-, ferro-magnets) and the possible area of their application (for ex. soft magnets for...
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Inna Soroka made a comment
Note, that magnetization is a vector sum of net magnetic moments of atoms. It means that although an individual atom may have a non-zero net magnetic moment, the total magnetization can be zero.
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Inna Soroka made a comment
Simply speaking, one Bohr magneton is a physical constant which equals the value of spin magnetic moment of an electron.
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Inna Soroka made a comment
Important here that magnetic fields are produced by moving charges
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For producing green energy we need materials, mainly those which are classified by the EU as critical and strategical raw materials. These materials are mainly supplied from China, thus we became dependent on one supplier. The EU tries to break this tendency and diversify the supply chain. One of the possibilities is to develop own mining and production...
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Inna Soroka made a comment
Magnetic materials can be classified according to their response to the applied external magnetic field: they can be either attracted or repelled by the magnetic field. Depending on the type of material these effects can be very strong, strong, weak, very weak and even negligible. Such experiment was done at the end of 18th century by French physicist, Gouy...
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Inna Soroka made a comment
In Lanthanum, in ground state, the 5d level is below 4f, therefore La contains 1 electron at d level and no electrons at 4f level. Strictly speaking, La is a 5d element. In the next element, Ce, the 5d and 4f shells possess almost the same energy, therefore, Ce has 1 electron at 4f and 1 electron at 5d shells. In Pr, there are 3 electrons at 4f shell. This...
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Inna Soroka made a comment
The periodic law states that the elements are arranged in ascending order of their atomic numbers and the properties of elements are determined by their atomic structures, in particular by the arrangement of electrons on electron shells/levels. Modelling of the atom's structure became possible only with the use of the quantum mechanical approach.
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Usually, rare earth elements are found in the ores of other metals like, for example, Cu, Al, Mn, or Fe. These ores consist of different minerals. Some of them contain rare earth elements, for example, monazite (Ce,La,Nd,Th) PO4 is a rare earth phosphate, (mined with Fe ores), or Bastnäsite is (Ce, La, Y) carbonate-fluoride, and others. Indeed, many rare...
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Inna Soroka made a comment
The Periodic table was discovered by a chemist, explained by physicists and used by everybody. Here we encourage you to delve deeper into the understanding of the periodic law, that is, the law of nature. One of the reasons why the rare earth elements constituting permanent magnets, are difficult to separate is the fact that their atomic structures are very...
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Inna Soroka made a comment
Hi, welcome to the course. Magnetism is everywhere, even life is possible, also thanks to the Earth's magnetic field. Magnetism is a very interesting and complex phenomenon. Physicists and chemists put many efforts to create a theory of magnetism. Although it is already known a lot, there are many questions to be answered in the future. In this course we try...
