Lattice strains and magnetic properties evolution of copper–magnesium ferrite with lithium substitution

• LixCu0.6Mg0.4−xFe2O4 was synthesized by calcining precursor oxalates in air.
• Magnetic properties evolution for LixCu0.6Mg0.4−xFe2O4 were explained.
• Magnetic properties of LixCu0.6Mg0.4−xFe2O4 can be precisely tailored.

LixCu0.6Mg0.4−xFe2O4 (0.0≤x≤0.3) is obtained by calcining precursor oxalates over 900 °C in air. The precursor and its calcined products are characterized by thermogravimetry and differential scanning calorimetry, X-ray powder diffraction, scanning electron microscopy, and vibrating sample magnetometer. A high-crystallized LixCu0.6Mg0.4−xFe2O4 with a cubic structure is obtained when the precursor is calcined at 900 °C in air for 3 h. The lattice constants of the ferrites decrease after Li+ doping. Magnetic properties of LixCu0.6Mg0.4−xFe2O4 depend on the composition and calcination temperature. Cu0.6Mg0.4Fe2O4 obtained at 900 °C has the highest specific saturation magnetization value, 42.44 emu/g; remanence value of Li0.2Cu0.6Mg0.2Fe2O4 obtained at 900 °C is close to zero.

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