纳米尺寸赤铁矿（α-Fe₂O₃）颗粒的合成与磁性
The synthesis and magnetic properties of nanosized hematite (alpha-Fe2O3) particles.
作者信息
Raming T P, Winnubst A J A, van Kats C M, Philipse A P
机构信息
Laboratory for Inorganic Materials Science, Department of Chemical Technology and MESA Research Institute, University of Twente, PO Box 217, Enschede 7500 AE, The Netherlands.
出版信息
J Colloid Interface Sci. 2002 May 15;249(2):346-50. doi: 10.1006/jcis.2001.8194.
The synthesis of nanosized superparamagnetic hematite particles by dissolving ferric salts in hydrochloric acid and heating at 100 degrees C is described. A hydrolysis reaction causes the formation of hematite particles. The influence of the sequence of additions on the resulting precipitates was studied using TEM and XRD. The magnetic behavior was characterized by magnetization measurements. It was found that small changes in the reaction conditions led to remarkable changes in final size and shape of the hematite crystallites. A well-defined subrounded morphology and an average diameter of 41 nm were obtained for superparamagnetic hematite particles. This is the largest size reported thus far for superpara-magnetic hematite particles.
描述了通过将铁盐溶解在盐酸中并在100℃加热来合成纳米级超顺磁性赤铁矿颗粒的方法。水解反应导致赤铁矿颗粒的形成。使用透射电子显微镜（TEM）和X射线衍射（XRD）研究了添加顺序对所得沉淀物的影响。通过磁化测量对磁行为进行了表征。发现反应条件的微小变化会导致赤铁矿微晶最终尺寸和形状的显著变化。超顺磁性赤铁矿颗粒获得了明确的次圆形形态，平均直径为41nm。这是迄今为止报道的超顺磁性赤铁矿颗粒的最大尺寸。
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