Soft magnetic, gyromagnetic, and microstructural properties of BBSZ-Nb2O5 doped NiCuZn ferrites for LTCC applications

The development of 5G technology places higher performance requirements on low-temperature co-fired ceramic (LTCC) materials. Here, a solid phase method was used to prepare BBSZ-Nb2O5 doped Ni0.22Cu0.31Zn0.47Fe2O4 samples, and the effects of doping 0.3 wt% BBSZ and different contents of Nb2O5 (x = 0.1, 0.3, 0.5, 0.7, 0.9 and 1.1 wt%) on the microstructure as well as the soft magnetic and gyromagnetic properties of the resulting samples were studied. The doping with Nb2O5 promoted crystal lattice expansion and densification under low temperature sintering conditions. The sample containing an Nb2O5 content of x = 0.9 had the highest measured mu' value of 212.6, which had increased by 15.9% relative to x = 0.1. Moreover, the measured M-s was the maximum value of 32.61 emu/g and Delta H reached the minimum value of 280 Oe for the x = 0.9 sample, which were 25.5% higher and 32.0% lower than those measured for the x = 0.1 sample, respectively. At x = 1.1, epsilon' had the minimum value of 21.4, which was 21.6% lower, and H-c reached the maximum value of 30.8 Oe, which increased by 7.6%. This reduction in Delta H for the doped NiCuZn samples makes them promising materials for use in microwave gyro magnetic devices or as antenna substrates based on LTCC integration technology.

Automated summary

The performance of low-temperature co-fired ceramic (LTCC) materials was improved by doping with Nb2O5, resulting in decreased Delta H and increased mu' and M-s values. These improvements make the material suitable for gyro magnetic devices and antenna substrates in 5G technology.