Abstract
The sintering behavior, microstructure and permeability of Co/Ti-substituted M-type hexagonal ferrites BaCoxTixFe12−2xO19 (1.0≤x≤1.4) was studied for applications as multilayer inductors in the high-frequency range up to 2GHz. Single-phase M-type ferrites were obtained after calcination at 1000°C. The saturation magnetization and coercivity decrease with x and hysteresis measurements illustrate a gradual transition of the anisotropy from uniaxial to planar. Addition of 5wt% of a BBSZ glass allows densification at 900°C through liquid-phase sintering. The permeability of samples sintered at 900°C increases with the Co/Ti substitution and reaches its maximum of µ′=16 at 1MHz at x=1.3 with a resonance frequency fr≥1GHz. Monolithic ferrite multilayer inductors were fabricated with printed Ag coil patterns by co-firing at 900°C. It is shown that Co/Ti-substituted hexagonal M-type ferrite is an excellent material for the high-frequency multilayer inductors.
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