Nano-TiO2 substituted LiZnBi ferrite ceramics with low sintering temperature and enhanced magnetic properties for LTCC applications

Saturation magnetization (4π M s ) and ferromagnetic resonance linewidth ( ΔH ) are vital parameters for microwave devices application. The material with high 4π M s and low ΔH is available in microwave frequency. In this work, to synthesize a ferrite material applied to X band, high saturation magnetization LiZnBi ferrite ceramics were selected as matrix. Further, in order to reduce magnetic loss of the LiZnBi ferrites sintered at low temperatures, various nano-TiO 2 were added. Interestingly, the nano-TiO 2 can promote grains growth and suitably enhance saturation magnetization and lower coercivity at low sintering temperature . Meanwhile, the ferromagnetic resonance linewidth ( ΔH ) of the ferrites can also be reduced by introducing more nano-TiO 2 particles. At last, a nano-TiO 2 substituted LiZnBi ferrite ceramics (x = 0.25) with high saturation magnetization (4π M s  = ∼3367 G), low coercivity ( H c  = ∼146.2 A/m) and low ferromagnetic resonance linewidth ( ΔH  = ∼192 Oe) were obtained at 880 °C. The ferrite material is serviceable for X band microwave devices, such as phase shifter and circulator.