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

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作者：
Ozkaya, Tevhide [1 ]
Toprak, Muhammet S. [2 ]
Baykal, Abdulhadi [1 ]
Kavas, Hüseyin [3 ]
Köseoglu, Yüksel [3 ]
Aktas, Bekir [4 ]
机构：
[1] Department of Chemistry, Fatih University, 34500 Buyukcekmece, Istanbul, Turkey
[2] Department of Microelectronics and Applied Physics, Royal Institute of Technology, 16440 Stockholm, Sweden
[3] Department of Physics, Fatih University, 34500 Buyukcekmece, Istanbul, Turkey
[4] Department of Physics, Gebze Institute of Technology, Cayirova, Izmit, Turkey
来源：
Journal of Alloys and Compounds | 2009年 / 472卷 / 1-2期
关键词：
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 °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/cm3 at 300 K; and TB is 134 K. The reduction of magnetic particle size and Ms is attributed to the presence of non-magnetic (dead) surface layer; compositional variations; superparamagnetic relaxation and spin canting because of the ultrafine nature of the material. The maximization in magnetization near the blocking temperature; TB; 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. © 2008 Elsevier B.V. All rights reserved;
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