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Information × Registration Number 0304U004181, 0103U004214 , R & D reports Title Influence of fundamental interactions on the properties of macro- and nanocrystals of the polisublattice ferrimagnets popup.stage_title Отримання об'єктів дослідження і комп'ютерне моделювання їх характеристик Head Kuntsevich S.P., Registration Date 26-03-2004 Organization Kharkov National University named after V.N.Karazin popup.description2 The object of the research - hexagonal ferrites of the structural type M and others in the form of monocrystals and nano- and microcrystallic dust. The target of the research - to synthesise hexaferrites of M and Z type - enriched with the isotope 57Fe and the natural isotopic composition; to obtain the model nanocrystal systems of the barium hexaferrite. The method of the research - magnetic static and resonance (FMR), x-rays (Т=77ч295К, Н<22ке), electronic microscopical. By the method of spontaneous crystallisation and crystallisation on the seed crystal there were synthesised structurally perfect, mechanically stable monocrystallic samples of the hexaferrites of the M-type - BaFe12O19, SrFe12O19, PbFe12O19 - enriched with the 57Fe isotope to the level of 95%, and also unenriched, and of the Z-type Ba3Zn2Fe24O41.There was researched the temperature dependence of the M-type hexaferrites crystal mesh parameters in the interval 90-295K.The magnetic characteristics of the synthesised samples are measured. The effectiveness of the cryochemical technology was proved in obtaining of the monophase barium hexaferrite nano- and microdusts with the linear dimensions of the particles of 5-100 nm and 0.1-1 mkm and the object close to the critical which can be model both for surface magnetism investigation and investigation of specifics of the magnetic behavior of the small particles - namely, the magnetic status change caused by dimensional factor. With the help of the computer modelling there was proved the influence to the experimental curve of the magnetisation of the ensemble anomaly to be caused by surface energy of the magnetic anisotropy. Product Description popup.authors popup.nrat_date 2020-04-02 Close