均匀Fe_3O_4胶体粒子形成机理 Ⅱ.低温Mssbauer谱研究

Mechanism of Formation of Uniform Magnetite Colloidal Particles Ⅱ. A Study of Mossbauer Spectroscopy at Low Temperature

在液氮温度下,测定了均匀Fe_3O_4胶体粒子制备过程中陈化时间为1小时内的不同时间所得样品的Μssbauer谱,结果表明,γ-FeOOH为Fe_3O_4均匀胶粒形成过程的中间产物,并提出均匀Fe_3O_4胶粒的形成机理为:

During the process of preparing uniform magnetite colloidal particles, a series of samples which were aging at different time not more than one hour were obtained by means of abruptly descending temperature Mossbauer spectra of these samples were measured at liquid nitrogen temperature. The results showed that γ-FeOOH was the intermediate product in the process of formation of uniform magnetite colloidal particles. The mechanism of formation of magnetite colloidal particles was given as follows:Fe3-α,O4 (uniform colloidal particle) Fe3+, Fe2+ Fe3O4 (uniform colloidal particles)