Magnetic and dielectric properties of low temperature fired ferrite/ceramic composite materials

Ni-Cu-Zn ferrite/CaTiO3 and Ni-Cu-Zn ferrite/BaTiO3 composites which can be applied in low temperature co-fired ceramic (LTCC) technology were synthesized by conventional solid-state reaction at temperature lower than 950 °C. Influence of the microstructures and the gap parameter δ/D on the complex permeability of the above two composites was investigated. The modified δ/D values of the above two composites show a good fit to the magnetic circuit model. The dielectric properties of the composites were predicted by the Maxwell-Garnett effective medium theory and the discrepancy between measured and calculated values was analyzed.