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在铁黄颗粒表面吸附硅或磷的化合物,可以提高经还原、氧化后所得γ-Fe_2O_3的矫顽力。用D.T.A、X射线衍射、电子显微镜和微区电子衍射等手段研究了这一现象。考虚到铁黄的结构模型,认为表面吸附的非金属离子,在结构相交中可以沿解理面内与C轴平行的孔道进入晶体内部,从而允许在较高温度下进行脱水和还原处理,颗粒仍能保持外形良好,有较高的形状各向异性,因而使得吸附处理后得到的γ-Fe_2O_3矫顽力增大。
The adsorption of silicon or phosphorus on the surface of iron yellow particles can increase the coercivity of γ-Fe_2O_3 after reduction and oxidation. D.T.A, X-ray diffraction, electron microscopy and micro-area electron diffraction and other means to study this phenomenon. Based on the structural model of iron yellow, the non-metal ions adsorbed on the surface can enter into the crystal along the pore parallel to the C axis in the cleavage plane during the structural intersection, allowing the dehydration and reduction treatment at higher temperature, The particles can still maintain a good shape, a high shape anisotropy, making the resulting γ-Fe 2 O 3 coercivity increased after adsorption treatment.