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研究了α-FeOOH 经过 Fe_3O_4转变成γ-Fe_2O_3的过程,以便了解还原条件对γ-Fe_2O_3磁性的影响。用普通方法和我们实验室发展的特殊方法制备γ-Fe_2O_3磁粉。用后一方法制得的磁粉的矫顽力比普通方法制得的磁粉的矫顽力高许多。用电子显微镜和穆斯堡尔效应分析了矫顽力增大的原因。
The conversion of α-FeOOH into γ-Fe_2O_3 through Fe_3O_4 was studied in order to understand the effect of reduction conditions on the magnetic properties of γ-Fe_2O_3. Γ-Fe 2 O 3 magnetic powders were prepared by ordinary methods and special methods developed by our laboratory. The coercive force of the magnetic powder obtained by the latter method is much higher than that of the magnetic powder obtained by the ordinary method. The reason of the increase of coercivity was analyzed by electron microscope and Mossbauer effect.