采用化学共沉淀法制备 Y 型平面六角铁氧体(Ba2Co0．4Zn1．0Cu0．6Fe12O 22)前驱体,并通过激光粒度分析仪(LPS)、扫描电子显微镜(SEM)、X 射线衍射仪(XRD)、振动样品磁强计(VSM)和 E4991A 精密阻抗分析仪等手段研究了共沉淀反应时间对粉体及烧结样品的粒径、表面形貌、晶体结构和磁性能的影响.结果表明,当共沉淀反应时间为90 h 时,得到的前驱体粉体粒径分布均匀,平均粒径约为1μm.在900℃烧结后能够得到较纯相的 Y 型平面六角铁氧体.烧结样品的相对密度超过95％,频率为1 GHz 时,起始磁导率μi ≈3．7,品质因数 Q ≈5．8,共振频率 f r ＞2．5 GHz,截止频率在3 GHz 左右.
The precursors of Y-type hexaferrite (Ba2 Co0.4 Zn1 .0 Cu0.6 Fe1 2 O 22 )were obtained by chemical co-precip-itation method,and the effects of co-precipitation reaction time on particle size,surface topography,crystal structure and magnetic properties of the powders and the sintering samples were investigated via laser particle size analyzer (LPS),scanning electron microscopy (SEM),X-ray diffraction (XRD),vibrating sample magne-tometer (VSM)and E4991A impedance analyzer.The results showed that the precursor obtained at 90 h (co-precipitation reaction time)has a relatively narrow grain size distribution (1 μm on average).The well-defined Y-type hexagonal ferrite was formed after sintered at 900 ℃.The sintered sample shows a relative density above 95%,an initial permeability (μi )of 3.7,a quality factor (Q )of 5.8 in the 1 GHz frequency,a resonance fre-quency above 2.5 GHz and a cutoff frequency around 3 GHz.
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