Ba3Co0.8Zn1.2Fe24O41</s ub> (Co2Z-type) hexaferrite particles for LTCC substrates

초록

A combination of energetic shake-milling and a subsequent double sintering process was employed to synthesize Co(0.8)Zn(1.2)Z (Ba3Co0.8Zn1.2Fe24O41) hexaferrite nanoparticles with a high-saturation magnetization and a low coercivity. A homogeneous mixture of BaCO3, CoO, ZnO, 40-nm sized alpha-Fe2O3, and heat-treating in an oxygen environment were important factors for synthesizing single-phase Co(2)Z-type ferrite nanoparticles. In addition to an X-ray diffraction pattern, Mossbauer spectra confirmed that only Fe3+ cations are present in the synthesized Co(0.8)Zn(1.2)Z particles, implying single phase of the particles. Low-temperature sintering processing, 900 degrees C, was then successfully applied to the single-phase Co(0.8)Zn(1.2)Z particles. The coercivities of the Co(0.8)Zn(1.2)Z powder and the low-temperature sintered disk were 9 and 20 Oe, respectively, while maintaining the saturation magnetization of 50 emu/g.

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