BST掺杂对M/Z型六角铁氧体复磁导率(1MHz^1GHz)的影响

Effect of BST additive on the complex permeability of M/Z-type hexaferrite in the range of 1MHz～1GHz

摘 要: 采用陶瓷工艺制备 Co2Z ( Ba3 ( Co0.4Zn0.6)2Fe23.4O41)和BaM(BaFi1.4Co1.4Fe9.2O19)六角铁氧体,二次球磨时掺杂少量 BST(BaSrTiO3 )铁电材料,对比研究了 BST 掺杂对 Z 型和 M 型铁氧体在1MHz~ 1GHz 频率范围内相对复磁导率(μr =μr′ iμr″)的影响。BST的掺杂使Z型铁氧体μr 增大,共振频率点移向低频;使M型铁氧体的μr 减小,共振频率点移向高频。通过对其微观结构和磁参数的测试分析,讨论了 BST掺杂对 Z型和 M型铁氧体复磁导率不同影响的作用机理。

M-type hexaferrite (BaFi1.4Co1.4Fe9.2O19) and Z-type hexaferrite (Ba3(Co0.4Zn0.6)2 Fe23.4O41) with BST (Ba0.5Sr0.5TiO3) additive was prepared by standard ceramic technique. We have investigated the effects of BST additive on the complex permeability in the range of 1 MHz - 1 GHz. the BST additive in the Z-type hexaferrite improve complex permeability and ferromagnetic resonance peaks shift to low frequency region; the BST additive in the M-type hexaferrite reduce complex permeability and provided broadband ferromagnetic resonance peaks shift to low frequency region. So we discuss why effects of doping BST (Ba0.5Sr0.5 TiO3) in M-type Hexaferrite (BaFi1.4Co1.4Fe9.2O19) and in Z-type hexaferrite (Ba3(Co0.4Zn0.6)2 Fe23.4O41) was different by testing microstructure and magnetic parameter.