Synthesis and Comparison of the Magnetic Properties of Iron Sulfide Spinel and Iron Oxide Spinel Nanocrystals

被引：40

作者：

Beal, John H. L. ^{[1
,2
]}

Prabakar, Sujay ^{[1
,2
]}

Gaston, Nicola ^{[3
,4
]}

Teh, Geok B. ^{[5
]}

Etchegoin, Pablo G. ^{[1
,2
]}

Williams, Grant ^{[3
,4
]}

Tilley, Richard D. ^{[1
,2
]}

机构：

[1] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand

[2] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Wellington, New Zealand

[3] Ind Res Ltd, Lower Hutt, New Zealand

[4] MacDiarmid Inst, Lower Hutt, New Zealand

[5] Tunku Abdul Rahman Coll, Sch Arts & Sci, Kuala Lumpur 50932, Malaysia

来源：

CHEMISTRY OF MATERIALS | 2011年 / 23卷 / 10期

关键词：

iron sulfide; iron oxide; nanocrystals; magnetic nanoparticles; spinel; magnetite; GREIGITE FE3S4; MICROSTRUCTURE; NANOPARTICLES; TEMPERATURE; CHEMISTRY; ENERGY; FE3O4;

D O I：

10.1021/cm2002868

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：

The synthesis and comparison of the magnetic properties of iron sulfide spinel and iron oxide spinel nanocrystals are examined. The ZFC/FC plot of the Fe3S4 nanocrystals has an inflection centered at 50 K, indicating a transition to superparamagnetism above this temperature. The ZFC and FC plots do not coincide, indicating the retention of some degree of magnetic irreversibility, which may be due to a small amount of high coercivity Fe1-xS impurity. A slight decrease in the susceptibility of the FC curve below the blocking temperature indicates some degree of antiferromagnetic order. The ZFC/FC plot of the Fe3O4 nanocrystals displays a distinct transition at 100 K, with the ZFC and FC plots coinciding above this temperature, and no decrease in the susceptibility of the FC curve below the blocking temperature. The shape of the FC curves of the samples indicates a degree of interparticle interaction, which can lead to an increase of temperature, when compared to a noninteracting ensemble.

引用

页码：2514 / 2517

页数：4

共 26 条

[1]

[Anonymous], 2000, Modern Magnetic Materials: Principles and Applications

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