摘要:
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.
Abstract:
MgO nano-particles are prepared by ultrasonic cavitate,andα-Fe2O3 nano-particles are prepared by chemical precipitation method,then MgO andα-Fe2O3 are mixed in a beaker.After the ultrasonic dispersion for 2 h,MgO/α-Fe2O3 admixture is calcined at 400℃to synthesize MgFe2O4 nano-particles.TEM and XRD tests show that MgFe2O4 takes on a spinel structure and the particles sizes range from 20 to 30 nm.The theoretical analysis indicates that the ultrasonic cavitate effect enhances the reaction activity of raw material,augmentes specific surface area and the contact area of reactant,which can promote reaction rate,reduce reaction temperature, and make possible the chemical reaction that is difficult to complete in common condition.
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