Effect of pH Value Regulators on the Formation and Magnetic Properties of MnZn Ferrite Nano-crystallite
MnZn ferrite(MZF)nano-crystallites were synthesized by sol-gel and auto-combustion method.The thermal decomposition process and the properties of the precursors are investigated by different pH regulators via TG-DTA,XRD,and VSM techniques.The results show that the pH value in sol and the pH value regulators have much relation with the formation of the MZF nanocrystallites.The ignition point of the gel increased from 196℃ to 207℃ with the pH value increasing from 3.4 to 10 in ammonia adjusted system.By adjusting pH value with ethylenediamine,the particle size can be controlled from 19nm to 57nm.The thermal decomposition reaction speed in ethylenediamine adjusted system is slower than in the ammonia adjusted system does.The saturation magnetization of the powder made in ethylenediamine adjusted system is 60 emu/g,and is about 70 emu/g in ammonia adjusted system.The coercive force of the powder in ethylenediamine adjusted system is increased when the pH value above 7.
MnZn ferrite nanocrystallitethermal analysispH valuepH value regulators
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