[en] The review concerns the results of studies reported in the last decade and concerning oxide ferromagnetic semiconductors which retain the spin orientation of charge carriers above room temperature. Particular attention is paid to methods of preparation of diluted magnetic semiconductors. Methods of synthesis and peculiarities of the physicochemical properties of films and coatings based on ferromagnetic semiconductors are described and prospects for application of these compounds as materials for spintronics are discussed. The bibliography includes 160 references.

[en] 

Abstract—

X-ray diffraction data have been used to construct the composition polyhedron of the (Y,Bi)₃(Fe,Ga)₅O₁₂ garnet phase (18 vertices and 11 faces) in the isobaric–isothermal Y₂O₃–Bi₂O₃–Fe₂O₃–Ga₂O₃ composition tetrahedron. We have identified nine crystalline phases involved in multiphase equilibria with the garnet phase, paying particular attention to equilibria involving the garnet and perovskite phases.

[en] Garnet ferrites with the overall composition (Y_1–xBi_x)3(Fe_1–yGa_y)₅O₁₂ (0 ≤ х ≤1, 0 ≤ y ≤1) have been synthesized and characterized by X-ray diffraction. A relationship has been demonstrated between an increase in the concentration of Ga³⁺ cations and an increase in Bi₂O₃ solubility in ss-Y₃(Fe,Ga)₅O₁₂.

[en] Compositions Li(Ni_0.33Mn_0.33Co_0.33)_1 – xFe_xO₂ (0 ≤ х ≤ 1) of the LiNiO₂–LiMnO₂–LiCoO₂–LiFeO₂ concentration tetrahedron have been studied. Samples were synthesized by gel combustion with starch, which afforded, for the first time, the impurity-free stable solid solution LiNi_0.2Mn_0.2Co_0.2Fe_0.4O₂ with an α-NaFeO₂ layered structure used as a cathode matrix of lithium-ion batteries. Electrochemical testing of homogeneous LiNi_0.2Mn_0.2Co_0.2Fe_0.4O₂ and the LiNi_0.3Mn_0.3Co_0.3Fe_0.1O₂ sample with the lowest iron content has been carried out. The results expand the understanding of the possibility of saturation with iron of Li(Ni,Mn,Co)O₂ with an α-NaFeO₂ structure and indicate the feasibility of further studying the homogeneity volume and properties of the Li(Ni,Mn,Co,Fe)O₂ solid solution.

[en] The behavior of the polarization of negative muons in Zn_0.99Co_0.01O was studied in order to search for a possible magnetic ordered phase. The sample was obtained using solid phase synthesis from ZnO and Co₃O₄. Measurements were performed in a magnetic field of 1.5 kG transverse to the muon spin in a temperature range of 5–300 K and in the absence of an external magnetic field at 6 K. No evidence of long-range magnetic order were observed.