Effect of B₂O₃ on the microstructure and properties of YCaZrVIG ferrites

CaZrVIG ferrite doped with B₂O₃ was prepared by using the traditional solid-phase method, the sintering temperature, microstructure and magnetic properties of which with B₂O₃ dosage was studied. The results showed that the B₂O₃ had no effect on the phase of the material and all samples were single phase garnet structure. B₂O₃ significantly reduced the sintering temperature of YCaZrVIG ferrite and decreased the particle size. When B₂O₃ dosage was 1.8wt%, the sintering temperature was about 1200°C and the bulk density was largest. When B₂O₃ dosage improved to 3.0wt%, the sintering temperature increased slightly and particle size was uneven. As the B₂O₃ dosage increased, 4πM_s and B_r significantly increased and then decreased, but H_c decreased and then increased sharply. An appropriate increase in the sintering temperature was beneficial to decrease of H_c. When it was doped with B₂O₃ 1.8wt% and sintered at 1290°C for 4 h, the comprehensive properties of the YBCaZrVIG ferrite were better (D_b=4.80 g·cm^-3, 4πM_s=1670 Gs, B_r=682 Gs, H_c=0.86 Oe).