J. Korean Ceram. Soc. > Volume 50(3); 2013 > Article
 Journal of the Korean Ceramic Society 2013;50(3): 231. doi: https://doi.org/10.4191/kcers.2013.50.3.231
 Ni0.5Zn0.4Cu0.1Fe2O4 Complex Ferrite Nanoparticles Synthesized by Chemical Coprecipitation Predicted by Thermodynamic Modeling Bo-Sun Kang, Joo-Seok Park1, Jong-Pil Ahn1, Kwang-Hyun Kim2, Ki-Sik Tae3, Hyun-Ju Lee4, Do-Kyung Kim2 Department of Radiological Science, Konyang University1Korea Institute of Ceramic Engineering and Technology2Inderstry-Academic Cooperation Foundation, Konyang University3Department of Biomedical Engineering, Konyang University4Department of Physical Therapy, Konyang University ABSTRACT Thermodynamic modeling of the $Ni_{0.5}Zn_{0.4}Cu_{0.1}Fe_2O_4$ complex ferrite system has been adopted as a rational approach to establish routes to better synthesis conditions for pure phase $Ni_{0.5}Zn_{0.4}Cu_{0.1}Fe_2O_4$ complex ferrite. Quantitative analysis of the different reaction equilibria involved in the precipitation of $Ni_{0.5}Zn_{0.4}Cu_{0.1}Fe_2O_4$ from aqueous solutions has been used to determine the optimum synthesis conditions. The spinel ferrites, such as magnetite and substitutes for magnetite, with the general formula $MFe_2O_4$, where M= $Fe^{2+}$, $Co^{2+}$, and $Ni^{2+}$ are prepared by coprecipitation of $Fe^{3+}$ and $M^{2+}$ ions with a stoichiometry of $M^{2+}/Fe^{3+}$= 0.5. The average particle size of the as synthesized $Ni_{0.5}Zn_{0.4}Cu_{0.1}Fe_2O_4$, measured by transmission electron microscopy (TEM), is 14.2 nm, with a standard deviation of 3.5 nm the size when calculated using X-ray diffraction (XRD) is 16 nm. When $Ni_{0.5}Zn_{0.4}Cu_{0.1}Fe_2O_4$ ferrite is annealed at elevated temperature, larger grains are formed by the necking and mass transport between the $Ni_{0.5}Zn_{0.4}Cu_{0.1}Fe_2O_4$ ferrite nanoparticles. Thus, the grain sizes of the $Ni_{0.5}Zn_{0.4}Cu_{0.1}Fe_2O_4$ gradually increase as heat treatment temperature increases. Based on the results of Thermogravimetric Analysis (TGA) and Differential Scanning Calorimeter (DSC) analysis, it is found that the hydroxyl groups on the surface of the as synthesized ferrite nanoparticles finally decompose to $Ni_{0.5}Zn_{0.4}Cu_{0.1}Fe_2O_4$ crystal with heat treatment. The results of XRD and TEM confirmed the nanoscale dimensions and spinel structure of the samples. Key words: $Ni_{0.5}Zn_{0.4}Cu_{0.1}Fe_2O_4$, Ferrite, Nanoparticles, Thermodynamic modeling, Coprecipitation
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