磁性纳米粒子SmCo_5的合成及表征  

Synthesis and Characterization of Magnetic Nanoparticles SmCo_5

作　　者：戴兢陶[1] 章彬彬[1] 催冬梅[1] 

机构地区：[1]盐城师范学院江苏省滩涂生物资源与环境保护重点建设实验室,江苏盐城224051

出　　处：《稀有金属材料与工程》2012年第12期2215-2218,共4页Rare Metal Materials and Engineering

基　　金：江苏省滩涂生物资源与环境保护重点建设实验室项目(JLCBE09025);国家自然科学基金(21077087)

摘　　要：SmCo5纳米粒子是重要的双金属稀土磁性材料。用四步制备了SmCo5纳米粒子。调节SmCl3和CoCl2混合溶液的pH至合适值后,加热回流,使得Sm3+和Co2+水解共沉淀。150℃下水热反应,制得粒径约为20nm的立方钐钴氧化物纳米粒子。最后,将水热制备的纳米氧化物在400℃氢气流中,以金属钠为还原剂,制得SmCo5纳米粒子。300K纳米粒子呈超顺磁状态,而5K时粒子呈铁磁状态,矫顽力为4.16×104A/m。SmCo5 nanoparticles are one of the most important binary transition metal-rare earth systems for magnetic materials. SmCo5 nanoparticles were fabricated by a four-stage route. At first, pH value of mixed aqueous soluble with SmCl3 and CoCl2 was adjusted using NaOH. Secondly, two soluble metal-salts were forced hydrolysis to oxides under atmospheric refluxing at 80 ℃. Then, oxide nanoparticles with a ca average size of 20 nm were prepared at 150 ℃ for 9 h through a convenient hydrothermal process. Finally, the SmCo5 nanoparticles were attained via hydrothermally prepared nanoparticles deoxidized using Na under the hydrogen stream at 400 ℃. The SmCo5 nanoparticles are superparamagnetic at 300 K while the particles are ferromagnetic with H c of 4.16×10 4 A/m at 5 K.

关 键 词：水热还原 SmCo5纳米粒子 磁性 

分 类 号：TB383.1[一般工业技术—材料科学与工程]