The crystalline and magnetic properties of Zn doped strontium Z-type hexaferrite synthesized by polymerizable complex method

摘要

Polycrystalline samples of Sr₃Co_2-x Zn _xFe₂₄O₄₁ (x = 0.0, 0.5, 1.0, 1.5, 2.0) were synthesized by a polymerizable complex method. The crystallographic, and magnetic properties of samples were investigated using x-ray diffractometer (XRD), vibrating sample magnetometer (VSM), and M?ssbauer spectroscopy. The crystal structures of all samples were determined to be hexagonal with the space group P6₃/mmc. The hysteresis curves under 10 kOe at 295 K showed that all samples were not saturated due to the high planar anisotropy of Sr ions. In addition, the coercivity (H_c) of samples decreased with increasing Zn ion contents. M?ssbauer spectra of all samples were obtained at 295 K, and least-squares fitted below T_C as six distinguishable sextets (4f_IV, 4f_IV*, 12k_VI*, 4f_VI*+ 4e_IV, 12k_VI, and 2d_V + 2a_VI + 4f_VI + 4e_VI).