氧化--共沉淀法制备Mn-Zn铁氧体的机理及影响因素  

Mechanism and effect factors on preparation of Mn-Zn ferrite by oxidation-coprecipitation

作　　者：罗广圣[1] 姜贵文 李瑞林 周正有[1] 李建德[1] 

机构地区：[1]南昌大学材料科学与工程学院,江西南昌330031 [2]共青学院,九江共青城332020

出　　处：《南昌大学学报（理科版）》2011年第3期247-250,共4页Journal of Nanchang University(Natural Science)

摘　　要：以FeSO4.7H2O、MnSO4.H2O、ZnSO4.7H2O、HCl为原料,NaOH溶液为沉淀剂、H2O2为氧化剂,采用氧化-共沉淀法在液相中制备Mn-Zn铁氧体,通过傅里叶变换红外光谱仪(IR),X射线衍射仪(XRD)和振动样品磁强计(VSM)对样品进行表征,讨论了Mn-Zn铁氧体在液相中的形成机理和氧化共沉淀法制备Mn-Zn铁氧体的影响因素。结果表明:采用氧化-共沉淀法能在液相中直接制备出Mn-Zn铁氧体,溶液的浓度和pH值是形成单相Mn-Zn铁氧体的两个关键因素;溶液的浓度和pH值低时,制备出的样品中含有非晶相FeOOH且饱和磁化强度低。Abstract： Mn-Zn ferrites（Mn0.5-Zn0.5RExFe2-xO4 ） were prepared by oxide co-precipitation method using Fe- SO4 · 7H2 O, MnSO4 · H20 , ZnSO4 ·7 H20 and RE2 03 （RE = Y, Nd, Gd, Dy）, HC1 as the raw materials, sodium hydroxide solution as the precipitating agent and hydrogen peroxide as the oxidizing reagent. The samples of Mn0.5-Zn0.5 Fe2 04 were characterized by FT-IR, XRD and VSM. The formation machnism of MnZn ferrite and the effects of concentration of solution and pH were studied on phase and magnetic proper ties of the samples were determined. The current findings indicate the samples of Mn-Zn ferrite could be prepared directly in solution by oxide co-precipitation method. The concentration of solution and pH are two key factors of this method, when the concentration of solution and pH are low, the samples prepared by this method contain FeOOH and the saturation magnetization is small The higher concentration and pH are the higher crystallinity and saturation magnetization will be achieved.

关 键 词：氧化-共沉淀 形成机理 PH值 浓度 饱和磁化强度 

分 类 号：TM2[一般工业技术—材料科学与工程]