磁性纳米粒子SmCo5的合成及表征

Synthesis and Characterization of Magnetic Nanoparticles SmCo5

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20 nm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。300 K纳米粒子呈超顺磁状态，而5 K时粒子呈铁磁状态，矫顽力为4.16×104 A/m

Abstract:

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 °C. Then, oxide nanoparticles with a ca average size of 20 nm were prepared at 150 °C 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 °C. The SmCo5 nanoparticles are superparamagnetic at 300 K while the particles are ferromagnetic with Hc of 4.16×104 A/m at 5 K