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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Mn-Doping level dependence on the magnetic response of MnxFe3-xO4 ferrite nanoparticles
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Mn-Doping level dependence on the magnetic response of MnxFe3-xO4 ferrite nanoparticles

机译：Mn-掺杂水平依赖于MnxFe3-XO4铁氧体纳米粒子磁响应的依赖性

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摘要

Manganese/iron ferrite nanoparticles with different Mn2+/3+ doping grades have been prepared by a thermal decomposition optimized approach so as to ascertain the doping effect on magnetic properties and, especially, on the magnetic hyperthermia response. The oxidation state and interstitial position of Mn in the spinel structure is found to be critical. The particle size effect has also been studied by growing one of the prepared samples (from 10 to 15 nm in diameter) by a seed mediated growth mechanism. After analyzing the main structural and chemical parameters such as the Mn/Fe rate, crystalline structure, particle diameter, shape and organic coating, some Mn doping induced changes have been observed, such as the insertion of Mn2+ cations yielded more anisotropic shapes. Magnetic characterization, carried out by DC magnetometry (M(H), M(T)) and electron magnetic resonance (EMR) techniques, has shown interesting differences between samples with varying compositions. Lower Mn doping levels lead to larger saturation magnetization values, while an increase of the Mn content causes the decrease of the effective magnetic anisotropy constant at low T. The homogeneous magnetic response under applied magnetic fields, together with the great effect of nanoparticle size and shape in such a response, has been confirmed by the EMR analysis. Finally, a detailed magnetic hyperthermia analysis has demonstrated the large influence of NP size and shape on the magnetic hyperthermia response. The optimized Mn0.13Fe2.87O4_G sample with a diameter of 15 nm and slightly truncated octahedral shape is presented as an interesting candidate for future magnetic hyperthermia mediated biomedical treatments.
机译：通过热分解优化方法制备具有不同MN2 + / 3 +掺杂等级的锰/铁铁氧体纳米颗粒，以确定对磁性的掺杂效果，特别是磁体热疗反应。发现Mn在尖晶石结构中的氧化状态和间质位置是至关重要的。还通过种子介导的生长机制生长制备的样品（直径10至15nm）中的一种制备的样品（从10至15nm）来研究粒度效应。在分析主要结构和化学参数之后，例如Mn / Fe速率，晶体结构，粒径，形状和有机涂层，已经观察到一些Mn掺杂诱导的变化，例如插入Mn2 +阳离子产生的各向异性形状。通过直流磁体（M（H），M（T））和电子磁共振（EMR）技术进行的磁性表征在具有变化组合物之间的样品之间显示了有趣的差异。较低的Mn掺杂水平导致饱和磁化强度值较大，而Mn含量的增加导致低T.在施加磁场下的均匀磁响应下的有效磁各向异性常数降低，以及纳米颗粒尺寸和形状的大效果在这种响应中，已通过EMR分析确认。最后，详细的磁热疗分析表明NP尺寸和形状对磁体热疗反应的巨大影响。具有直径为15nm和略微截断的八面体形状的优化Mn0.13Fe2.87O4_g样品作为未来磁体热热性介导的生物医学治疗的有趣候选者。

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