Magnetic multiresonance behavior of Fe@Al2O3 nanoembedments and microstructural evolution during mechanosynthesis

JOURNAL OF ALLOYS AND COMPOUNDS

卷:509

Article

Shi, Zhi-cheng¹  Zhang, Zi-dong¹  Guo, Jing-yan¹  Gao, Meng¹  Qi, Xiao-gang¹  Bi, Jian-qiang¹  Fan, Run-hua¹  Tuan, Wei-hsing² 

[1] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Peoples R China

[2] Taiwan Natl Univ, Dept Mat Sci & Engn, Taipei 106, Taiwan

关键词: Milling;    Nanocomposites;    Magnetic properties;    Al2O3;    Microwave properties;   

DOI  :  10.1016/j.jallcom.2011.02.082

来源: Elsevier

【 摘 要 】

The embedding of metal nanoparticles into an insulating ceramic matrix can provide encapsulation and prevent their oxidation and agglomeration. A nanoembedment powder with the Fe nanoparticles embedded into Al2O3 matrix is prepared by high-energy ball milling. Starting from the highly exothermic reactant mixture of magnetite and aluminum, Fe nanoparticles were in situ formed in Al2O3 matrix by mechanochemical reaction. It is found that a post-reaction milling significantly narrows the size distribution of Fe nanoparticles. The mechanism for the two-stage milling process was proposed. The microwave permeability of nanoembedments exhibited a multiresonance behavior, which was the evidence for monodispersed Fe nanoparticles. The Fe@Al2O3 nanoembedments are potential candidates as microwave absorber and left-handed materials. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

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