凝胶-热分解法制备NiFe_2O_4纳米粉末及其性能表征  

Characterization of NiFe_2O_4 Nanoparticles and Preparation by Gel-thermal Decomposition Method

作　　者：冯旺军[1,2] 成金娟[2] 耿丹[2] 时均增[2] 杨华[1,2] 

机构地区：[1]甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050 [2]兰州理工大学理学院,甘肃兰州730050

出　　处：《新技术新工艺》2010年第7期69-72,共4页New Technology & New Process

基　　金：国家自然科学基金资助项目(50962009);甘肃省自然科学基金资助项目(0916RJZA0);甘肃省教育厅资助项目(0803-03)

摘　　要：以硝酸铁、硝酸镍以及柠檬酸为原料,采用凝胶-热分解法制备出了尖晶石NiFe2O4纳米粉末。研究了凝胶-热分解法的反应机理和反应过程,讨论了热处理温度对颗粒平均尺寸以及性能的影响。利用X射线衍射(XRD)、TEM以及VSM对样品物性进行表征,结果表明,所制样品为纯相的NiFe2O4纳米颗粒,颗粒的大小为35～65 nm,且颗粒的粒径随热处理温度的升高而增大,当热处理温度为700℃时,颗粒大小均匀、分散性好,比饱和磁化强度达到54.63 emu/g。同时,作者也对反应的动力学原理进行了研究,得出NiFe2O4纳米颗粒形成的活化能为16.15 kJ/mol。The NiFe2O4nanoparticles have been successfully prepared by Gel-thermal decomposition method from raw materials of Fe nitrate salts,Ni nitrate salts and citric acid. This article has discussed the gel-thermal decomposition reaction mechanism,reaction process,and the different thermal treatment temperature which has effect the crystal size and property of NiFe2O4 nanoparticles. The structure of the NiFe2O4 nanoparticles was characterized by X-ray diffraction（XRD）, trarls mission electron microscopy（TEM） and VSM. The results showed that the products were pure phase NiFe2O4 and the aver- age crystal size of all particle NiFe2 04 was 35- 65 nm,What＇s more, the crystal size increased when the heat treatment tern perature increase. When the thermal temperature was 700 ℃, the product has more less aggregation, the specific saturation magnetization strength was 54.63 emu/g. Simultaneity, the article also studied the kinetics of the thermal decomposition process of the precursor and obtained the activation energy of NiFe2 O4 nanoparticles formation during thermal treatment was about 16.15 kJ/mol.

关 键 词：凝胶 NiFe2O4纳米粉末 热处理温度 比饱和磁化强度 活化能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]