Eu-doped α-Fe2O3 nanoparticles with modified magnetic properties

被引：35

作者：

Freyria, Francesca Stefania ^{[1
,2
]}

Barrera, Gabriele ^{[3
]}

Tiberto, Paola ^{[3
]}

Belluso, Elena ^{[4
,5
,6
]}

Levy, Davide ^{[4
]}

Saracco, Guido ^{[1
,2
]}

Allia, Paolo ^{[1
,2
]}

Garrone, Edoardo ^{[1
,2
]}

Bonelli, Barbara ^{[1
,2
]}

机构：

[1] Politecn Torino, Dept Appl Sci & Technol, I-10129 Turin, Italy

[2] Politecn Torino, INSTM Unit Torino Politecn, I-10129 Turin, Italy

[3] INRIM, Electromagnetism Dept, I-10135 Turin, Italy

[4] Univ Turin, Dept Earth Sci, I-10125 Turin, Italy

[5] Univ Turin, Ist Geosci & Georisorse, CNR, I-10125 Turin, Italy

[6] Univ Turin, NIS Excellence Ctr, Unita Torino, I-10125 Turin, Italy

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2013年 / 201卷

关键词：

Hematite; Nanoparticles; Europium; Rare-earths; Magnetic properties; HEMATITE PARTICLES; SUBSTITUTED HEMATITE; FERRIHYDRITE; MORPHOLOGY; GOETHITE; SHAPE; IONS; XPS; TRANSFORMATION; MECHANISM;

D O I：

10.1016/j.jssc.2013.03.018

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Eu-doping of hematite (alpha-Fe2O3) nanoparticles (NPs) takes place under hydrothermal conditions, and does not at ambient temperature and pressure. Required circumstances have been studied in detail. In the presence of Eu, besides hematite, some goethite and ferrihydrite are formed. Evidence for the occurrence of doping is reported. Chemical composition, as studied by EDS (bulk) and XPS (surface), reveals an enrichment of Eu at NPs core, ascribed to the occurrence of a two-step mechanism of NP formation, comprising nucleation at first, in which Eu3+ ions compete with Fe3+ ions, notwithstanding the large difference in concentration, and a successive growth step. of NPs in a solution comparatively richer in Fe3+ species. The Eu content affects: (i) the morphology of NPs, as shown by TEM and FE-SEM; (ii) lattice parameters, as obtained by Rietveld refinement of XRD patterns; (iii) magnetic properties, due to the presence of Eu3+ ions, characterized by a higher one-ion anisotropy and a lower magnetic moment with respect to iron cations. (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：302 / 311

页数：10

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