Effect of Mn doping on the synthesis and properties of nearly spherical Sm2Fe17N3 powders

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-05-02 DOI:10.1016/j.materresbull.2025.113530

Pengfei Yue , Jingwu Zheng , Shuqi Zong , Wei Cai , Haibo Chen , Liang Qiao , Min Lin , Yao Ying , Jing Yu , Juan Li , Wangchang Li , Shenglei Che

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Abstract

To achieve smaller particle sizes of Sm₂Fe₁₇N₃ magnetic powders, crushing is often applied to the obtained powders. However, this process introduces more angular edges and increases the risk of oxidation. In this study, nearly spherical Sm₂(Fe,Mn)₁₇N₃ magnetic powders with controllable particle sizes and strong oxidation resistance were prepared eliminating the need for crushing, using a combined ultrasonic spray pyrolysis-reduction diffusion method. The results show that appropriate Mn doping facilitates particle size refinement. Mn doping of Fe increased lattice expansion without altering crystal structure. The optimal coercivity occurred at a 5 at.% Mn doping. Furthermore, as the Mn doping level increased, the proportion of adsorbed oxygen decreased, slowing the occurrence of further oxidation reactions and impeding the transformation of metallic elements into higher-valence oxides, thereby enhancing oxidation resistance. The addition of Mn improved the thermal stability and magnetic properties of Sm₂Fe₁₇N₃ magnets, offering a promising method for producing high-performance permanent magnets.

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Mn掺杂对近球形Sm2Fe17N3粉末合成及性能的影响

为了使Sm₂Fe₁₇N₃磁粉的粒度更小，通常对得到的粉末进行粉碎。然而，这个过程引入了更多的棱角，增加了氧化的风险。本研究采用超声波喷雾热解-还原扩散相结合的方法，制备了粒径可控、抗氧化性强的近球形Sm₂（Fe,Mn）₁₇N₃磁粉，消除了粉碎的需要。结果表明，适当的Mn掺杂有利于晶粒细化。Mn掺杂Fe增加了晶格膨胀，但没有改变晶体结构。最佳矫顽力出现在5at。% Mn掺杂。此外，随着Mn掺杂水平的增加，吸附氧的比例降低，进一步氧化反应的发生减慢，阻碍了金属元素向高价价氧化物的转变，从而增强了抗氧化性。Mn的加入改善了Sm2Fe17N3磁体的热稳定性和磁性能，为制备高性能永磁体提供了一种很有前途的方法。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.