Dy^(3+)及Ca^(2+)-Ge^(4+)联合取代对石榴石铁氧体高功率低损耗特性的影响

Effect of Dy^(3+)and Ca^(2+)-Ge^(4+)substitution on high-power and low-loss properties of garnet ferrites

采用传统陶瓷工艺制备Dy^(3+)和Ca^(2+)-Ge^(4+)取代的钇铁石榴石铁氧体,考察Dy^(3+)和Ca^(2+)-Ge^(4+)取代对材料显微结构、饱和磁化强度、铁磁共振线宽、自旋波线宽、电阻率等性能的影响。研究表明,Dy^(3+)取代24c位的Y^(3+),对样品显微结构、饱和磁化强度、电阻率和介电损耗无明显影响。随着Dy^(3+)取代量的增加,自旋波线宽从8.9 Oe提高到28.5 Oe。为了降低材料的损耗,采用适量的Ca^(2+)-Ge^(4+)取代24c位的Y^(3+)和24d位的Fe^(3+),铁磁共振线宽从162 Oe减小到102 Oe,自旋波线宽从15.3 Oe增大到22.5 Oe。此外,Ca^(2+)-Ge^(4+)取代对石榴石铁氧体的介电损耗影响不大,使其保持良好的介电性能。

Dy^(3+)and Ca^(2+)-Ge^(4+)substituted yttrium iron garnet ferrites were prepared by traditional ceramic process.The effects of Dy^(3+)and Ca^(2+)-Ge^(4+)substitutions on the microstructure,saturation magnetization,ferromagnetic resonance linewidth,spin wave linewidth,and resistance of the garnet ferrites were investigated.The results show that the substitution of Dy^(3+)ions for Y^(3+)ions on 24c-site has no obvious effect on the microstructure,saturation magnetization,resistivity and dielectric loss.With increase of Dy^(3+)substitution,the spin wave linewidth increases from 8.9 Oe to 28.5 Oe.In order to reduce the loss of garnet ferrites,appropriate amounts of Ca^(2+)-Ge^(4+)ions are substituted for Y^(3+)ions on 24c-site and Fe^(3+)ions on 24d-site,respectively.The ferromagnetic resonance linewidth is reduced from 162 Oe to 102 Oe and the spin wave linewidth increases from 15.3 Oe to 22.5 Oe.In addition,the In^(3+)substitution has little effect on the dielectric loss of the garnet ferrites,maintaining excellent dielectric properties.