Magnetic and Dielectric Properties of Low Temperature co-fired Na-Ta co-doped M-type Barium Ferrites

Na-Ta ions co-doped M-type barium ferrites, BaFe12-2x(NaTa)(x)O-19, were synthesized at low temperature by the solid-state method. Na-Ta ion could occupy crystalline sites but not change the phase formation of barium ferrite. SEM images showed that samples had the regular and hexangular shape with 1-2 mu m size. With the increase of Na-Ta, saturation magnetization (M-s) obviously decreased from 57.5 emu/g to 37.6 emu/g, and the coercivity (H-c) decreased from 4156 Oe to 2069 Oe. For dielectric properties, the real part permittivity (epsilon') increased when x from 0.0 to 0.3, reaching the maximum value in a range frequency of 10 MHz-500 MHz, while decreasing when x=0.4. This material would be applied in electronic devices using LTCC technology.