Peculiarities of ZnS_xSe_1-x:Mn, Nanocrystals Obtained by Combustion Synthesis

Purpose. Determination of the dimensional characteristics, phase and chemical composition of ZnS_xSe_1-x nanocrystals with a parameter step x = 0.2, obtained by the combustion synthesis.

Methods. Characterization of ZnS_xSe_1-x nanocrystals using scanning microscopy, X-ray diffraction analysis and EPR spectroscopy obtained by the combustion synthesis.

Results. We determined the crystal lattice parameters of the synthesized ZnS_xSe_1-x:Mn nanocrystals, which were ranged from a = 5.386 Å (для х = 1) to a = 5.633 Å (для х = 0). We determined the sizes of the synthesized ZnS_xSe_1-x:Mn nanocrystals, which were ranged ranged from 50±5 nm to 80±5 nm. The dependences of the loaded charge before synthesis and the powder obtained after synthesis, microstresses and sizes of nanocrystals depending on the parameter x, fractions of cubic and hexagonal phases depending on the parameter of composition x, half-widths of narrow and wide lines of the EPR spectrum on parameter x, the resonant value of the magnetic field of the broad absorption line due to Mn²⁺ ions and the constant A of the hyperfine structure of the EPR spectra of Mn²⁺ ions on the parameter x are plotted.

Conclusion. The obtained nanocrystals are characterized by a high perfection of the crystal structure. The change in the studied dependences for ZnS_0.4Se_0.6:Mn nanocrystals and upon transition from ZnS_0.2Se_0.4:Mn nanocrystals to ZnS_0.4Se_0.6:Mn nanocrystals can be explained by the smallest size of ZnS_0.4Se_0.6:Mn nanocrystals, the simultaneous presence of almost the same amount of S and Se in the solid solution, and an increase in the role of surface phenomena at the nanocrystal boundary.

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