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用超声水解方法制备MgO纳米颗粒,用化学沉淀法制备α-Fe_2O_3纳米颗粒,将MgO/α-Fe_2O_3混合体常温下超声活化2 h,400℃固相合成制备出MgFe_2O_4纳米颗粒.通过X射线衍射和透射电子显微镜测试产品的化学成分、晶体结构和形貌尺寸,分析声化学反应机理及其影响因素.研究结果表明:所制备的MgFe_2O_4为尖晶石铁氧体,颗粒尺寸分布在20-30 nm之间,粒度分布均匀;超声空化效应提高了化学反应活性、增加反应物的比表面积和反应物之间的接触面积,促进固相合成反应速度,降低反应温度,实现了一般条件下难以完成的化学反应.
MgO nanoparticles were prepared by ultrasonic hydrolysis and α-Fe_2O_3 nanoparticles were prepared by chemical precipitation. The MgO / α-Fe_2O_3 mixture was activated by ultrasonic at room temperature for 2 h and then solid-phase synthesized at 400 ℃ to prepare MgFe_2O_4 nanoparticles by X-ray diffraction And chemical composition, crystal structure and morphology of the product were measured by transmission electron microscopy, and the mechanism of acoustochemical reaction and its influencing factors were analyzed.The results show that the prepared MgFe 2 O 4 is spinel ferrite with particle size distribution in the range of 20-30 nm, the particle size distribution is even. Ultrasonic cavitation enhances the chemical reactivity, increases the specific surface area of the reactants and the contact area between the reactants, promotes the solid-phase synthesis reaction rate and reduces the reaction temperature, and realizes that it is difficult under normal conditions Complete chemical reaction.