Influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite

被引：17

作者：

Cvejic, Z. ^{[2
]}

Antic, B. ^{[1
]}

Kremenovic, A. ^{[1
,3
]}

Rakic, S. ^{[2
]}

Goya, G. F. ^{[4
]}

Rechenberg, H. R. ^{[4
]}

Jovalekic, C. ^{[5
]}

Spasojevic, V. ^{[1
]}

机构：

[1] Solid State Phys Lab, Inst Nucl Sci Vinca, Belgrade 11001, Serbia

[2] Univ Novi Sad, Fac Nat Sci, Inst Phys, Novi Sad 21000, Serbia

[3] Univ Belgrade, Crystallog Lab, Fac Min & Geol, Belgrade 11000, Serbia

[4] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil

[5] Univ Belgrade, Ctr Multidisciplinary Studies, Belgrade 11000, Serbia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 472卷 / 1-2期

关键词：

Oxide materials; Mechanochemical processing; Microstructure; Magnetic measurements; X-ray diffraction; CATION DISTRIBUTION; NANOPARTICLES; MAGNETIZATION; TRANSITION; FE3O4;

D O I：

10.1016/j.jallcom.2008.05.026

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work we report results on the influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite. A series of Fe2.85RE0.15O4 (RE = Gd, Dy, Ho, Tm and Yb) samples have been prepared by high energy ball milling. Structure/microstructure investigations of two selected samples Fe2.85Gd0.15O4 and Fe2.85Tm0.15O4, represent an extension of the previously published results on Fe3O4/gamma-Fe2O3, Fe2.85Y0.15O4 and Fe2.55In0.45O4 [Z. Cvejic, S. Rakic, A. Kremenovic, B. Antic, C. Jovalekic. Ph. Colomban, Sol. State Sciences 8 (2006) 908], while magnetic characterization has been done for all the samples. Crystallite/particle size and strain determined by X-ray diffractometry and Transmission electron microscopy (TEM) confirmed the nanostructured nature of the mechanosynthesized materials. X-ray powder diffraction was used to analyze anisotropic line broadening effects through the Rietveld method. The size anisotropy was found to be small while strain anisotropy was large, indicating nonuniform distribution of deffects in the presence of Gd and Tm in the crystal structure. Superparamagnetic(SPM) behavior at room temperature was observed for all samples studied. The Y-substituted Fe3O4 had the largest He and the lowest M-S. We discuss the changes in magnetic properties in relation to their magnetic anisotropy and microstructure. High field irreversibility (H>20kOe) in ZFC/FC magnetization versus temperature indicates the existence of high magnetocrystalline and/or strain induced anisotropy. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：571 / 575

页数：5

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