铁电陶瓷/铁氧体叠层共烧体的介电特性

Dielectric Properties of Ferroelectrics/Ferrite Cofired Multilayer Materials

采用电介质物理学等效电路分析方法研究了Pb(Ni1/3Nb2/3)O3基铁电陶瓷与NiZnCu铁氧体叠层共烧体的介电频率响应,探讨了共烧体界面对介电性能的影响。结果表明,叠层共烧体的介电常数随频率的增加而减小,介电损耗随着频率的增加先增大后减小,有明显的损耗峰出现;界面扩散层对叠层共烧体电学响应有影响,叠层共烧体等效电路可视为介电材料层、铁氧体材料层和界面扩散层Cre-Rre等效电路的串联,并且界面扩散层会对叠层共烧体低频部分的介电响应起作用。

The dielectric properties of ferroelectrics/ferrite cofired multilayer materials were investigated by equivalent circuit analysis. The results showed that the dielectric constant decreased with increasing frequency. It was observed that the loss peak appeared in the dissipation factor vs frequency curve. The equivalent circuit analysis revealed that the cofired ferroelectrics/ferrite multilayer composite was not simply series connection by the equivalent circuit of ferroelectrics and ferrite. The interface layer had effect on the dielectric properties of the composite. The thickness of the interface layer was similar to the diffusion distance, which had great influence on the dielectric properties at low frequency.