摘要
Six kinds of typical commercial Fe2O3 were sampled and divided into two groups A and B. according to the magnetic measurement results. The samples of group A are of susceptibility about 10-4 and the specific saturation magnetization σs 0.2-0.3 A.M2/kg, being consistent with the feature of antiferromagnetic α-Fe2O3. While the samples of group B display strong magnetism with susceptibility 10-1-10-2 and σs 1.7-12 A.M2 /kg. Mossbauer spectra of the samples were investigated at room temperature in an external magnetic field. It is suggested there is the y - Fe2O3 phase in the group B according to the relative intensities of spectra I(2,5)/I(3,4). This was proved by the Mossbauer spectra for the mixed samples A with γ-Fe2O3 at various contents and by measuring the dependence of specific saturation magnetization on temperature for the samples of group B.
Six kinds of typical commercial Fe2O3 were sampled and divided into two groups A and B. according to the magnetic measurement results. The samples of group A are of susceptibility about 10-4 and the specific saturation magnetization σs 0.2-0.3 A.M2/kg, being consistent with the feature of antiferromagnetic α-Fe2O3. While the samples of group B display strong magnetism with susceptibility 10-1-10-2 and σs 1.7-12 A.M2 /kg. Mossbauer spectra of the samples were investigated at room temperature in an external magnetic field. It is suggested there is the y - Fe2O3 phase in the group B according to the relative intensities of spectra I(2,5)/I(3,4). This was proved by the Mossbauer spectra for the mixed samples A with γ-Fe2O3 at various contents and by measuring the dependence of specific saturation magnetization on temperature for the samples of group B.
