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具有高磁能积的钕铁硼/铁钴纳米复合材料的化学合成

Chemical synthesis of NdFeB/Fe-Co nanocomposite with high magnetic energy product.

作者信息

Ngo Hieu Minh, Lee Gyutae, Haider Syed Kamran, Pal Umapada, Hawari Thomi, Kim Kyung Min, Kim Jongryoul, Kwon Hae-Woong, Kang Young Soo

机构信息

Department of Chemistry, Sogang University #1 Shinsu-dong, Mapo-gu Seoul 121-742 Republic of Korea

Department of Materials Science & Chemical Engineering, Hanyang University #320, 55, Hanyangdaehak-ro, Sangnok-gu Ansan Kyeonggi-do 426-791 Republic of Korea.

出版信息

RSC Adv. 2021 Oct 1;11(51):32376-32382. doi: 10.1039/d1ra03760a. eCollection 2021 Sep 27.

DOI:10.1039/d1ra03760a
PMID:35495536
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9041725/
Abstract

NdFeB is one of the most popular permanent magnets (PMs) possessing the best energy product (BH) among the common PM materials. However, exchange-coupled nanocomposite magnets fabricated by embedding nanostructures of soft-phase magnetic materials into a hard-phase magnetic matrix manifest higher remanence and a higher energy product. Here we present the fabrication of exchange coupled NdFeB/Fe-Co magnetic nanocomposites using gel-combustion and diffusion-reduction processes. Pre-fabricated CoFeO nanoparticles (NPs) of ∼5 nm diameter were incorporated into a Nd-Fe-B oxide matrix during its synthesis by gel-combustion. The obtained mixed oxide was further processed with oxidative annealing at 800 °C for 2 h and reductive annealing at 900 °C for 2 h to form a NdFeB/Fe-Co nanocomposite. Nanocomposites with different mol% of soft-phase were prepared and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and physical property measurement system (PPMS) to study their crystalline phase, morphology and magnetic behavior. Addition of 7.7 mol% of soft-phase was found to be optimum, producing a coercivity ( ) of 5.6 kOe and remanence ( ) of 54 emu g in the nanocomposite.

摘要

钕铁硼是最受欢迎的永磁体之一，在常见永磁材料中具有最佳的磁能积（BH）。然而，通过将软相磁性材料的纳米结构嵌入硬相磁性基体中制备的交换耦合纳米复合磁体表现出更高的剩磁和更高的磁能积。在此，我们展示了使用凝胶燃烧和扩散还原工艺制备交换耦合钕铁硼/铁钴磁性纳米复合材料的过程。在通过凝胶燃烧合成钕铁硼氧化物基体的过程中，将直径约5纳米的预制钴铁氧体纳米颗粒（NPs）掺入其中。所得混合氧化物进一步在800℃下进行2小时的氧化退火，并在900℃下进行2小时的还原退火，以形成钕铁硼/铁钴纳米复合材料。制备了具有不同摩尔百分比软相的纳米复合材料，并通过X射线衍射（XRD）、透射电子显微镜（TEM）和物理性能测量系统（PPMS）对其进行表征，以研究它们的晶相、形态和磁行为。发现添加7.7摩尔%的软相是最佳的，该纳米复合材料的矫顽力（ ）为5.6 kOe，剩磁（ ）为54 emu g 。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c05/9041725/eae1e81ecdf4/d1ra03760a-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c05/9041725/eea988064a86/d1ra03760a-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c05/9041725/32b6eeb94b07/d1ra03760a-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c05/9041725/eae1e81ecdf4/d1ra03760a-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c05/9041725/eea988064a86/d1ra03760a-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c05/9041725/18ab57638bea/d1ra03760a-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c05/9041725/00e4b951b21c/d1ra03760a-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c05/9041725/1c9d418e81e7/d1ra03760a-f4.jpg
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