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Abstract
The effects of Zn2+ and Ti4+ substitutions on the microstructure and properties of low temperature sintered M-type barium hexaferrites Ba(ZnTi)xFe12−2xO19 have been studied in order to adapt the development of low temperature cofired ferrites technology and produce circulators with a multilayer process. It is found that part of Zn2+ ions can enter into 2b sublattice and the saturation magnetization of the samples decrease when x increases. The additive of 3–5 wt % Bi2O3⋅B2O3⋅SiO2 glass lowers the sintering temperature to about 900 °C, which is ideal for cofiring with silver paste. Scanning electron microscope and x-ray diffraction analysis show that the samples have excellent crystalline grains with a uniform size about 1.0 μm. A high density of 4.85 g/cm3 is obtained in the samples sintered at 900 °C with 5 wt % glass additive. Magnetic measurements show that the saturation magnetization reaches 63.5 emu/g (about 308 kA/m) at 900 °C and increases as the sintering temperature arises.
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