石榴石铁氧体的介电常数与密度、饱和磁化强度和缺铁量的关系

Dependence of the dielectric constant on density, saturation magnetization and iron deficiency for garnet

采用普通陶瓷工艺制备了饱和磁化强度Ms为80~148 kA/m的小线宽石榴石铁氧体材料,按GB/T9633(等同IEC60556)标准)在10.7 GHz下测量了复合石榴石铁氧体的介电常数ε′和介电损耗角正切tanδ_ε。研究了e'与材料密度、饱和磁化强度Ms和缺铁量的关系。实验表明,e'随密度的增加而增大,随Ms的下降而减小,随缺铁量增加而降低。即,介电常数随着配方中代换离子的增加、Fe含量的减少而下降,说明了e'与Fe浓度密切相关。

Polycrystalline garnet materials with saturation magnetization of80to148kA/m and narrow linewidth were prepared by conventional ceramic process.According to the National Standard GB/T9633(equal to IEC60556standard)for gyro-magnetic materials,the dielectric constantε′and dielectric loss tanδεof YIGs were measured at10.7GHz.The effect of density,saturation magnetization Ms and iron deficiency on the dielectric constantε′was investigated.It is shown that the dielectric constantε′increases with increasing density and Ms and decreasing the iron deficiency.Results indicate that the dielectric constantε′depends on the iron content strongly.