Growth, structure and magnetism of epsilon-Fe2O3 in nanoparticle form

Lopez-Sanchez J.; Munoz-Noval A.; Serrano A.; Abuin M.; de la Figuera J.; Marco J. F.; Perez L.; Carmona N.; Rodriguez de la Fuente O.

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Growth, structure and magnetism of epsilon-Fe2O3 in nanoparticle form

机译：EPSILON-FE2O3在纳米粒子形式中的生长，结构和磁性

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We present a novel and easy synthetic path to prepare epsilon-Fe2O3 (similar to 90%) with a small portion of alpha-Fe2O3 nanoparticles embedded in an amorphous silica matrix. An exhaustive structural study reveals the higher relative concentration of the epsilon-phase, with an average particle size of 17 nm. Confocal Raman microscopy and X-ray absorption spectroscopy are presented as novel techniques to characterize the epsilon-polymorph. The magnetic properties have been studied in a wide range of temperatures (5-1000 K), detecting blocking effects (similar to 135 K), collapse effects (50-125 K), Morin (similar to 268 K) and Neel (similar to 505 K) transitions.

机译：我们提出了一种新颖且易于合成的途径，用于使用嵌入非晶二氧化硅基质中的一小部分α-Fe 2 O 3纳米颗粒制备Epsilon-Fe2O3（类似于90％）。详尽的结构研究揭示了ε-阶段的相对浓度较高，平均粒径为17nm。共聚焦拉曼显微镜和X射线吸收光谱呈递作为表征ε-多晶型物的新技术。已经在宽范围的温度（5-1000k）中研究了磁性，检测阻断效果（类似于135 k），塌陷效应（50-125 k），morin（类似于268 k）和neel（类似于 505 k）过渡。

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《RSC Advances》 |2016年第52期|共8页
作者
Lopez-Sanchez J.; Munoz-Noval A.; Serrano A.; Abuin M.; de la Figuera J.; Marco J. F.; Perez L.; Carmona N.; Rodriguez de la Fuente O.;
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Univ Complutense Madrid Dept Fis Mat E-28040 Madrid Spain;

ESRF Spanish CRG BM25 SpLine F-38000 Grenoble France;

Univ Complutense Madrid Dept Fis Mat E-28040 Madrid Spain;

Univ Complutense Madrid Dept Fis Mat E-28040 Madrid Spain;

Unidad Asociada IQFR CSIC UCM Madrid 28040 Spain;

Unidad Asociada IQFR CSIC UCM Madrid 28040 Spain;

Univ Complutense Madrid Dept Fis Mat E-28040 Madrid Spain;

Univ Complutense Madrid Dept Fis Mat E-28040 Madrid Spain;

Univ Complutense Madrid Dept Fis Mat E-28040 Madrid Spain;

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正文语种 eng
中图分类化学;
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Growth, structure and magnetism of epsilon-Fe2O3 in nanoparticle form

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