Two-line ferrihydrite particles are synthesized. Structural characterization of the sample is done with an X-ray diffractometer, transmission electron microscope, Fourier-transform infrared spectroscope, and thermogravimetric analyzer. Average particle size is 2 nm. Temperature variation (10–300 K) of zero-field-cooled and field-cooled susceptibility in 500 G applied magnetic field bifurcates at 50 K. The field-cooled susceptibility below this temperature is almost temperature independent. Magnetization versus applied magnetic field (0–120 kG) data at 300 K are analyzed considering particle size distribution.

中文翻译：

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双线水铁矿纳米粒子的磁性

合成了两线水铁矿颗粒。使用 X 射线衍射仪、透射电子显微镜、傅里叶变换红外光谱仪和热重分析仪对样品进行结构表征。平均粒径为 2 nm。500 G 外加磁场中零场冷却和场冷却磁化率的温度变化 (10–300 K) 在 50 K 处分叉。低于该温度的场冷却磁化率几乎与温度无关。考虑到粒度分布，分析了 300 K 下的磁化强度与外加磁场 (0–120 kG) 数据。