Improving the Magnetic Properties of Li-Zn-Ti Ferrite by Doping with H3BO3-Bi2O3-SiO2-ZnO Glass for LTCC Technology
Li-Zn-Ti ferrite doped with 0.5 wt.% to 16 wt.% H3BO3-Bi2O3-SiO2-ZnO (BBSZ) glass was synthesized using a low-temperature ceramic sintering process. Selected parameters of saturation induction (BS), coercivity (HC), Curie temperature (TC), and complex permeability spectra were measured as functions of doping content, and their relationships with ferrite density and microstructure are discussed. It was found that Li-Zn-Ti ferrite can be fired at low temperature (900°C) with BBSZ glass content varying from 0.5 wt.% to 2 wt.%. The real permeability increased from 80 to 190 in the frequency range from 1 MHz to 3 MHz, the saturation induction BS increased from 105 mT to 150 mT at 1 kHz, whereas the coercivity HC decreased from 165 A/m to 65 A/m at 1 kHz and the Curie temperature TC slightly declined from 155°C to 143°C. These results confirm that this new ferrite material could be used in low-temperature cofired ceramic (LTCC) devices.