Dieletric and magnetic properties of Zn-Ti substituted M-type barium hexaferrite

摘要

The Zn-Ti substituted barium hexaferrite polycrystalline samples have been synthesized by solid-state reaction method. The complex permittivity and permeability measurements are carried out on the BaFe_(12-2x)Zn_xTi_xO_(19) (0.2≤x≤0.6) samples in the microwave frequency range of 8-13 GHz by cavity perturbation technique. The observed abnormal dielectric behavior, i.e., an increasing tendency of dielectric constant with frequency has been attributed to the mixed conduction.rnThe effect of Zn-Ti substitution on the permittivity and dielectric loss has been investigated in the frequency range of 1 kHz-1 MHz as well. The increase in concentration of Zn-Ti dopants monotonically increases both the permittivity and the permeability in the investigated frequency ranges, which can be attributed to increased polarizability and unpinning of the domain walls, respectively.