Synthesis conditions, crystal structure and magnetic properties of Mn–Tm–Se selenides

Single-phase compositions in the MnSe–TmSe quasi-binary section have been synthesized by the method of reactions in the solid phase. The crystal structure of polycrystalline powders has been studied in CuK_α-radiation. It was found that the samples in the concentration range 0  x  0.7 have a cubic structure of the space group Fm m3 . An increase in the concentration of Tm cations in the Mn_1–xTm_xSe compositions leads to an increase in the unit cell parameter a from 0.547 nm for the Mn_0.975Tm_0.025Se compound to 0.566 nm for the Mn_0.3Tm_0.7Se composition. Thin layers of Mn_1–xTm_xSe solid solutions were synthesized by the flash method on optically transparent glass substrates. The film thicknesses are in the range of values from 0.8 to 3.2 µm. It has been established that Mn_1–xTm_xSe films also have the system NaCl, S.G.: Fm m3 . The composition of the Mn_1–xTm_xSe films corresponds to the chemical composition of the MnSe–TmSe charge powders. In the temperature range ~ 80–900 K, the va lues of the specific magnetization and magnetic susceptibility of the studied selenides were measured. The results obtained make it possible to determine the temperature regimes for the synthesis of new magnetic semiconductor substances, including those in the film state. The synthesized substances can be used in multifunctional microelectronic devices, as well as in the development of new materials capable of operating in wide temperature ranges and under the influence of external magnetic fields.

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