Zn- and Cu-substituted Co2Y hexagonal ferrites: Sintering behavior and permeability
Zn- and Cu-substituted Co2Y hexagonal ferrites: Sintering behavior and permeability
复制标题
Zn 和 Cu 取代的 Co2Y 六方晶系铁氧体：烧结行为和磁导率
DOI：
10.1016/j.jmmm.2012.01.006
复制
发表时间：
2012
影响因子：
2.7
通讯作者：
J. Töpfer
中科院分区：
文献类型：
--
作者：
S. Bierlich;J. Töpfer
采用混合氧化物法制备了Y型多晶六方晶系铁氧体Ba2Co2−x− yZnxCuyFe12O22（0≤x≤2和0≤y≤0.8）。在1000°C煅烧后得到单相Y型铁氧体粉末。在1200°C下烧结的样品显示出随着Zn取代Co而增加的磁导率，并且对于x=1.6和y=0.4，在1MHz下显示出μ′=35的最大磁导率。对于y=0和0.4的富锌铁氧体，观察到共振频率fr=500MHz。Zn取代Co后，饱和磁化强度增加，Bi_2O_3的加入使最大收缩温度降低到T≤950°C。此外，Cu浓度的增加进一步将烧结温度降低至T≤900°C，使得铁氧体与多层技术的Ag金属化共烧成为可能。然而，低温烧成将磁导率降低到μ′=10，并且谐振频率移动到1GHz。因此，取代的六角Y型铁氧体可用作高频应用的多层电感器的软磁材料。
Y-type polycrystalline hexagonal ferrites Ba2Co2−x−yZnxCuyFe12O22with 0≤x≤2 and 0≤y≤0.8 were prepared by the mixed-oxide route. Single phase Y-type ferrite powders were obtained after calcinations at 1000°C. Samples sintered at 1200°C show a permeability that increases with the substitution of Zn for Co and display maximum permeability of μ′=35 at 1MHz for x=1.6 and y=0.4. A resonance frequency fr=500MHz is observed for Zn-rich ferrites with y=0 and 0.4. The saturation magnetization increases with substitution of Zn for Co. Addition of Bi2O3shifts the temperature of maximum shrinkage down to T≤950°C. Moreover, an increase of the Cu-concentration further lowers the sintering temperature to T≤900°C, enabling co-firing of the ferrites with Ag metallization for multilayer technologies. However, low-temperature firing reduces the permeability to μ′=10 and the resonance frequency is shifted to 1GHz. Thus substituted hexagonal Y-type ferrites can be used as soft magnetic materials for multilayer inductors for high frequency applications.