Chemical synthesis and characterization of SmCo5/Co magnetic nanocomposite particles

• 作者: Ying Dong Tian-Li Zhang Hui Wang Xin Liu Cheng-Bao Jiang
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 1224-1231
• 页数: 8页
• 语种: 英文

摘要

Magnetic nanocomposite material has been widely focused for the potential to become the next gen-eration of magnetic material.In this paper,two kinds of chemical coating methods were used to prepare SmCo5/Co nanocomposite particles which were further characterized and compared.The two methods were carried out by using different materials and at different temperatures.In Method Ⅰ,oleylamine(Oam),oleic acid and Ca(acac)2 were used and the reaction was carried out at the temperature of 300℃.In Method Ⅱ,anhydrous isopropanol,polyvinylpyrrolidone(PVP),N2H4·H2O and CoCl2·6H2O were used and the reaction temperature was～55℃.It was found that by using the two methods,the growth and the crystal structure of the Co nanoparticles(NPs)are different.In Method I,epitaxial growth on the surface of SmCo5 NPs was observed and the Co NPs were in a face-centered close packing crystal structure.While in MethodⅡ,the coated Co NPs were self-nucleated with a crystal structure of hexagonal close packing.Using Method Ⅱ with the addition of surfactant,anisotropic nanocomposite par-ticles were achieved with an enhanced saturated magneti-zation of 84.2 A·m2·kg-1.And the coercivity change of the NPs illustrates that a nonmagnetic interlayer between the hard and soft magnetic phase is beneficial to maintain the coercivity.