Structural, Magnetic, and Thermodynamic Evolutions of Zn-Doped Fe3O4 Nanoparticles Synthesized Using a One-Step Solvothermal Method
2016
Liu, Xin | Liu, Jun | Zhang, Shihui | Nan, Zhaodong | Shi, Quan
Zn-doped Fe₃O₄ magnetic nanoparticles represented as ZnₓFe₃₋ₓO₄ with different Zn contents of x varying from 0.0 to 1.0 were synthesized using a facile one-step solvothermal method. The Zn/Fe ratio in these particles could be accurately controlled using this facile synthesis technique. The ICP-OES and XRD measurements indicated that in the x range from 0 to 0.4 the doped Zn²⁺ may replace the Fe³⁺ at the A site and consequently the B-site Fe²⁺ changed to Fe³⁺, while above 0.4 the Zn²⁺ tends to replace the B-site Fe²⁺. The morphologies and size distributions of these samples characterized from the TEM showed that the nanoparticles appeared to aggregate into magnetic nanocrystal clusters with varying cluster sizes and different Zn doping contents. The magnetic measurement and Mössbauer spectra investigation revealed that the magnetic properties of the ZnₓFe₃₋ₓO₄ would exhibit a sensitive dependence with the doped Zn variations. Most importantly, the heat capacity studies illuminated that, at low temperatures, the samples could have a ferromagnetic contribution with x = 0.0 and 0.2 and turn to an antiferromagnetic contribution with x = 0.5, 0.8, and 1.0.
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