Crystal Structure, Magnetic and Electric Properties of Highly Coercive Ferrites Sr_(1-x)Sm_xFe_(12-x)Zn_xO_(19) (0 ≤ × ≤ 0.4)

摘要

The samples of highly coercive ferrites Sr_(1-x)Sm_xFe_(12-x)Zn_xO_(19) (0 ≤ × ≤ 0.4) with the structure of magnetoplumbite have been obtained by the solid-phase method. It has been determined that the samples Sr_(1-x)Sm_xFe_(12-x)Zn_xO_(19) are single-phase at × ≤ 0.2 and contain the impurity phases of α-Fe2O3, SmFeO3, and ZnFe2O4 at × ≥ 0.3 In the magnetic fields up to 14 T, the specific magnetization has been measured and the values of coercive force (σH_c) have been determined at 5 and 300 K. It has been shown that semiconductor electroconductivity of single-phase samples Sr_(1-x)Sm_xFe_(12-x)Zn_xO_(19) gradually decreases with the increase in the degree of substitution of × from 0 to 0.2.