Sm₂Co₁₇ nanoparticles synthesized by surfactant-assisted high energy ball milling

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• 作者：Liyun Zheng ; Baozhi Cui ; Lixin Zhao ; Wanfeng Li ; George C. Hadjipanayis
• 关键词：Surfactant-assisted high energy ball milling ; Microstructure ; Nanoparticles
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 出版时间：25 October, 2012
• 年：2012
• 卷：539
• 期：Complete
• 页码：69-73
• 全文大小：1501 K

文摘

Synthesis of rare-earth-based magnetically hard single-crystal nanoparticles with significant magnetic properties and large quantities is highly challenging. Surfactant-assisted high energy ball milling (HEBM) is usually used for the preparation of separated Sm-Co-based hard nanoparticles. In this study, Sm₂Co₁₇ hard nanoparticles have been synthesized by the surfactant-assisted HEBM SmCo₅ precursors. Phases, microstructure, particle sizes and magnetic properties of the synthesized Sm₂Co₁₇ nanoparticles have been investigated in detail. The results showed that the precursors had great effects on the microstructure of the synthesized Sm₂Co₁₇ nanoparticles. The Sm₂Co₁₇ nanoparticles prepared by one-step HEBM of ingot powders in heptane for 5 h using oleic acid as surfactant had a single-crystal and a coercivity of 8.3 kOe. The majority of the Sm₂Co₁₇ nanoparticles synthesized using oleylamine as a surfactant showed single-crystal, accompanied by the presence of a few of polycrystalline. In the case of two-step milling (initial low energy ball milling of ingot powders for 18 h and then HEBM for 5 h), the obtained nanoparticles were polycrystalline and showed a low coercivity. When the precursor was jet-milled SmCo₅ powders, the synthesized Sm₂Co₁₇ nanoparticles had both single-crystal and polycrystalline nanostructures.