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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Magnetic properties of maghemite nanoparticles in a polyvinylpyridine matrix
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Magnetic properties of maghemite nanoparticles in a polyvinylpyridine matrix

机译：聚乙烯吡啶基体中磁赤铁矿纳米粒子的磁性

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摘要

Magnetic measurements have been carried out on nanocomposites consisting of individual maghemite (gamma-Fe2O3) particles distributed throughout a polyvinylpyridine matrix with a range of particle sizes and concentrations. Magnetic measurements and particle size measurements have been compared to investigate particle size effects upon magnetic properties. Magnetisation increases slowly with increasing iron content up to approximately 18%, at which point the increase becomes sharper. Magnetic moment, as derived from a modified Langevin equation, is found to be less than the value expected from the particle, indicating possible surface effects. Blocking temperatures have been observed to increase with increasing iron concentration. Assuming no significant particle interactions it is possible to consider the effective anisotropy of individual particles. Effective anisotropy has been observed to increase with decreasing particle size, implying an increase in contribution from surface effects, and increases with the presence of rod shaped particles, implying a contribution from shape anisotropy. (C) 2003 Elsevier Science Ltd. All rights reserved. [References: 27]
机译：已经对纳米复合物进行了磁测量，该纳米复合物由分布在整个聚乙烯吡啶基体中的单个磁赤铁矿（γ-Fe2O3）颗粒组成，具有一定的粒度和浓度范围。已经比较了磁测量值和粒度测量值，以研究粒度对磁性能的影响。随着铁含量增加到大约18％，磁化作用缓慢增加，这时增加变得更加明显。发现从修改的Langevin方程得出的磁矩小于粒子预期的值，表明可能存在表面效应。已经观察到阻塞温度随着铁浓度的增加而增加。假设没有明显的粒子相互作用，则可以考虑单个粒子的有效各向异性。已经观察到有效各向异性随着粒径的减小而增加，这意味着来自表面效应的贡献增加，并且随着棒状颗粒的存在而增加，这暗示了形状各向异性的贡献。 （C）2003 Elsevier ScienceLtd。保留所有权利。 [参考：27]

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