(Mg, Zn)_xFe_3–xO₄ NANOPARTICLES: SYNTHESIS, MAGNETIC PROPERTIES, SURFACE FUNCTIONALIZATION

The nanoparticles of (Mg, Zn)_xFe_3–xO₄ (x ≤ 0.3) solid solutions have been prepared by coprecipitation with Na₂CO₃ from solutions of salts. For a number of compositions (Mg_0,1Fe_2,9O₄, Mg_0,05Zn_0,1Fe_2,85O₄, Zn_0,18Fe_2,82O₄), an increase of saturation magnetization has been detected, as compared to non-substituted magnetite (MS = 64 emu/g). This can be explained by the tendency of zinc and small amounts of magnesium ions to occupy preferentially tetrahedral sites of the magnetite lattice. In the case of zinc and magnesium joint substitution in the (Mg, Zn)_xFe_3–xO₄ system up to x = 0.3, the values of saturation magnetization decrease slightly comparing to that of magnetite, but remain constant (MS ≈ 58 emu/g). By ultrasound assisted dispersion of nanopowders into polyelectrolyte aqueous solutions, colloidal solutions of non-agglomerated nanoparticles have been prepared. Тhe nanoparticles modified with a layer of positively charged polyelectrolyte demonstrate the best sedimentation stability up to 45 days. Their hydrodynamic diameter is lower than 200 nm, with predominance of the fraction with the size of 40–80 nm.

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