Synthesis of Fe3O4 nanoparticles at 100°C and its magnetic characterization

被引：235

作者：

Ozkaya, Tevhide ^{[1
]}

Toprak, Muhammet S. ^{[2
]}

Baykal, Abdulhadi ^{[1
]}

Kavas, Hueseyin ^{[3
]}

Koseoglu, Yuksel ^{[3
]}

Aktas, Bekir ^{[4
]}

机构：

[1] Fatih Univ, Dept Chem, TR-34500 Istanbul, Turkey

[2] Royal Inst Technol, Dept Microelect & Appl Phys, S-16440 Stockholm, Sweden

[3] Fatih Univ, Dept Phys, TR-34500 Istanbul, Turkey

[4] Gebze Inst Technol, Dept Phys, Cayirova, Izmit, Turkey

来源：

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

关键词：

Magnetic materials; Chemical synthesis; X-ray diffraction; Magnetite; TEMPERATURE SYNTHESIS; FERROUS HYDROXIDE; AQUEOUS-MEDIA; SIZE; MECHANISM; OXIDATION; MN3O4; GEL;

D O I：

10.1016/j.jallcom.2008.04.101

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：

Superparamagnetic iron oxide nanoparticles were synthesized by a novel, simple and cost-effective gel-to-crystalline method by alkalizing ferrous chloride with ammonium hydroxide at 80-100 degrees C under refluxing conditions. Average crystallite size is determined as 11 nm from XRD and 11.4 nm from TEM: magnetic domain size is 9.7 nm. The saturation magnetization is 390 emu/cm(3) at 300 K, and TB is 134 K. The reduction of magnetic particle size and M-s is attributed to the presence of non-magnetic (dead) surface layer, compositional variations, superparamagnet relaxation and spin canting because of the ultrafine nature of the material. The maximization in magnetization near the blocking temperature, T-B, is attributed to a large degree of inversion of the Fe3O4 particles. Results also indicated the existence of interparticle interactions in the thermomagnetic characteristics of spinels at lower field strengths. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：18 / 23

页数：6

共 63 条

[1] Synthesis of nanocrystalline Mn3O4 at 100 °C [J].