Magnetic properties of CoFe1.9RE0.1O4 nanoparticles (RE = La, Ce, Nd, Sm, Eu, Gd, Tb, Ho) prepared in polyol

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作   者：

Ben Tahar L;  Artus M;  Ammar S;  Smiri LS;  Herbst F;  Vaulay MJ;  Richard V;  Greneche JM;  Villain F;  Fievet F; 

作者机构：

LS] Fac Sci Bizerte;  LCI2M;  Jarzouna 7021;  [Richard;  Unite Rech 99;  [Greneche;  Herbst;  F-75251 Paris;  [Ben Tahar;  UR12 30;  Vaulay;  F] Univ Paris 06;  Ammar;  Tunisia;  UMR CNRS 7086;  Smiri;  JM] Univ Maine;  LPEC;  F;  LMPTM;  F-72085 Le Mans;  ITODYS;  V] UPR CNRS 9001;  Fievet;  F] Univ Paris Diderot;  L;  Inst Galilee;  [Villain;  M;  S;  [Artus;  F-93430 Villetaneuse;  France;  UMR CNRS 7071;  MJ;  UMR CNRS 6087; 

关键词：

THIN-FILMS;  SPINEL FERRITE NANOPARTICLES;  Nanoparticle;  XANES;  EELS;  MEDIATED SYNTHESIS;  ZINC FERRITE;  Superparamagnetism;  Rare earth;  SOL-GEL SYNTHESIS;  LIQUID POLYOLS;  Ferrimagnetism;  NI-ZN FERRITE;  Mossbauer;  NANOCRYSTALLINE FILMS;  CoFe2O4;  MAGNETOOPTICAL PROPERTIES;  Polyol;  NANOSCALE FUNCTIONAL MATERIALS; 

期刊名称：

Journal of Magnetism and Magnetic Materials

i s s n：

0304-8853

年卷期：

2008 年 320 卷 23 期

页   码：

3242-3250

页   码：

摘   要：

Highly crystalline CoFe1.9RE0.1O4 ferrite nanoparticles, where RE = La, Ce, Nd, Sm, Eu, Gd, Tb, and Ho, have been synthesized by forced hydrolysis in polyol. X-ray diffraction (XRD), transmission electron microscopy (TEM), electron energy-loss spectroscopy (EELS), Fe-57 Mossbauer spectrometry, Co K-edge X-ray absorption spectroscopy and magnetic measurements using a SQUID magnetometer were employed to investigate the effect of the substitution RE3+ ions for Fe3+ ones on the structure, the microstructure, the chemical homogeneity, and the magnetic properties of the cobalt ferrite system. All the produced particles are superparamagnetic at room temperature. Nevertheless, the substitution causes reduction of the blocking temperature which is mainly ascribed to partial cation exchange among the spinel-like sublattices of CoFe2O4 induced by the insertion of the relatively large RE3+ ions. The low-temperature saturation magnetization and coercivity appear to be greatly affected by the nature of RE3+ ions-maxima values were found for Gd3+ and Eu3+, respectively. (C) 2008 Elsevier B.V. All rights reserved.