The effects of the BaO·(Nd0.8Bi0.2)2O3·4TiO2 (BNBT) to NiCuZn ferrite ratio and addition of Bi2O3-B2O3-SiO2-ZnO (BBSZ) glass on the sintering behavior, microstructure evolution, dielectric and magnetic properties of BNBT-NiCuZn ferrite composites were investigated in developing low-temperature-fired composites for high frequency electromagnetic interference (EMI) devices. The results indicate that these composites can be densified at 900 °C and exhibit superior dielectric and magnetic properties with the addition of BBSZ glass. The dielectric system used in the ferrite-dielectric composites reported in the previous studies mostly belong to the ferroelectricity group, which are not suitable for use in the high frequency range (>800 MHz) due to the selfresonance frequency limit. In this study, the dielectric constant remains nearly a constant over a wide range of frequencies (100 MHz to 1 GHz) and the magnetic resonance frequencies are larger than 100 MHz for the BNBT + BBSZ glass-NiCuZn ferrite composites. Therefore, the BNBT + BBSZ glass-NiCuZn ferrite composites can be a good candidate material for high frequency EMI device applications.
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