INFLUENCE OF SYNTHESIS CONDITIONS ON THE STRUCTURAL AND MAGNETIC PROPERTIES OF CoFe2O4
DOI:
https://doi.org/10.15421/jchemtech.v32i2.303152Keywords:
precipitation; sodium hydroxide; simplex-lattice planning of the experiment; response function.Abstract
The article proposes the synthesis of CoFe2O4 by a modified coprecipitation method followed by plasma treatment. With the help of simplex planning of the experiment, the samples were synthesized using different precipitants. X-ray phase analysis and vibrational magnetometry were used to characterize the obtained samples. Diagrams of the composition of the precipitator and the response function are given in the paper. Alkalis in the NaOH - LiOH - KOH system were used as precipitants. The response functions were a coercive force, saturation magnetization, average crystallite size, crystallite size along the X-ray pattern line (311), crystallite size along the X-ray pattern line (400), dislocation density, and percentage of microstrains. Summarizing the results of mathematical modeling and graphical display of experimental data, presented in the form of composition-property diagrams, made it possible to quantitatively assess the influence of the nature of the precipitant on the structural and magnetic properties of cobalt ferrites. The saturation magnetization for samples obtained using sodium hydroxide is higher than for other samples. High saturation magnetization values also apply to samples along the NaOH-LiOH line. It is established that isolines corresponding to high values of saturation magnetization coincide with larger values of the lattice parameter. An inverse relationship is observed for the values of microstresses and the density of dislocations. That is, a more perfect crystal structure corresponds to improved magnetic properties. X-ray phase analysis also showed that the presence of impurities reduces the saturation magnetization and increases the coercive force.
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