Abstract
The magnetic and dielectric properties of Bi–Zn codoped Y-type hexagonal ferrite was investigated. The samples with composition of Ba 2− x Bi x Zn 0.8+ x Co 0.8Cu 0.4Fe 12− x O 22 ( x = 0–0.4) were prepared by the solid-state reaction method. Phase formation was characterized by X-ray diffraction. The microstructure was observed via scanning electron microscopy. The magnetic and dielectric properties were measured using an impedance analyzer. Direct current (dc) electrical resistivity was measured using a pA meter/dc voltage source. Minor Bi doping ( x = 0.05–0.25) will not destroy the phase formation of Y-type hexagonal ferrite, but lower the phase formation temperature distinctly. Bi substitution can also promote the sintering process. The Bi-containing samples ( x > 0.05) can be sintered well under 900 °C without any other addition. The sintering temperature is about 200 °C lower than that of the Bi-free sample. The Bi–Zn codoped samples exhibit excellent magnetic and dielectric properties in hyper frequency. These materials are suitable for multi-layer chip-inductive components.
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