Abstract：As spinel ferrites material with unique structure, magnetic anisotropy and high coercivity, cobalt ferrite has attracted much attention. The magnetic properties of cobalt ferrite are dependent on the sample composition, size and cationic occupation closely at the nanoscale. In this paper, ZnxCo1-xFe2O4 (0≤x≤0.4) nanoparticles with good dispersion were synthesized by pyrolysis method. The test results show that Zn2+ was successfully doped into CoFe2O4, and the particle size distributed between 6 and 8 nm, indicating that the Zn2+ doping has ignorable influence on the particle size. Magnetic investigations indicate that with the increase of Zn2+, the saturation magnetization and net magnetic moment of sample decreased gradually. This is because that under the small size effect, Co2+ is distributed at both tetrahedral (A) and octahedral (B) sites, and Zn2+ is replace the Co2+ at A sites preferentially. Which makes parts of Co2+ migrate from the A to B sites to reduce the strain, so that Co2+ and Fe3+ at the B octahedral sites appear partial anti-parallel arrangement, and the A-O-B magnetic interaction is weakened. The results show that the non-magnetic Zn2+ can induce the cation redistribution and control the magnetic properties further of spinel ferrite.
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2023, Vol. 30 