Study on the influence of magnesium doping on the magnetic properties of spinel Zn-Mg ferrite

Polycrystalline spinel ferrite powders of Zn1-xMgxFe2O4, (x = 0.0, 0.4, 0.8, and 1.0) have been synthesized by solid-state reaction. An antiferromagnetic Neel temperature (T-N = 25 K) point is observed in ZnFe2O4, while MgFe2O4 shows a strong ferromagnetism. The magnetization value of Zn(1-x)MgxFe(2)O(4) increases first and then decreases with the increase of x. When x = 0.8 (Zn0.2Mg0.8Fe2O4), the value of the saturation magnetization (M-s) reaches a maximum as 85.566 emu/g. The magnetization of Zn(1-x)MgxFe(2)O(4) shows a very sensitive response to the Mg2+ concentration at the tetrahedral sites (A-sites) or the octahedral sites (B-sites). I suggest that the A?B super-exchange interaction is enhanced after Mg2+ ions substituting Zn2+ ions.

Automated summary

Polycrystalline spinel ferrite powders of Zn1-xMgxFe2O4 were synthesized by solid-state reaction, showing a sensitive response of magnetization to Mg2+ concentration. The saturation magnetization of Zn(1-x)MgxFe(2)O(4) reaches a maximum value near x = 0.8.