Effect of alloying Ni inner electrodes on the leakage current degradation of BaTiO3-based multilayer ceramic capacitors
Effect of alloying Ni inner electrodes on the leakage current degradation of BaTiO3-based multilayer ceramic capacitors
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DOI：
10.1063/5.0002701
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发表时间：
2020-03-30
影响因子：
4
通讯作者：
Sano, Harunobu
中科院分区：
文献类型：
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作者：
Suzuki, Shoichiro;Yamaguchi, Shinichi;Sano, Harunobu
高容量多层陶瓷电容器（MLCC）大多是电子陶瓷元件，其中镍内电极和BaTiO3基电介质交替层压。由于它们在智能手机等便携式电子设备中的用途，人们不断需要获得尺寸更小、容量更高的 MLCC。我们研究了 Ni 内电极与各种元素的合金化对 MLCC 漏电流衰减的影响。选择Fe、Cu、Zn、Sn添加到Ni中，与BaTiO3共烧，得到Cu、Sn与Ni的合金化。使用Ni-Cu和Ni-Sn内电极的MLCC的漏电流衰减时间比使用Ni内电极的MLCC长。特别是，使用 Ni-Sn 内电极的 MLCC 的漏电流劣化得到了显着抑制。随着 BaTiO3 基电介质厚度的减小，这种抑制效果增强。这种优化 Ni 内电极成分的方法可以导致 MLCC 的进一步小型化和容量增加。
High-capacitance multilayer ceramic capacitors (MLCCs) are mostly electronic ceramic components in which Ni inner electrodes and BaTiO3-based dielectrics are laminated alternately. Owing to their usefulness in portable electronic devices such as smartphones, there is an ongoing demand to attain an MLCC with smaller dimensions and improved capacity. We investigated the effect of alloying Ni inner electrodes with various elements on the leakage current degradation of MLCCs. Fe, Cu, Zn, and Sn were chosen and added to Ni and co-fired with BaTiO3, from which Cu and Sn were alloyed with Ni. The leakage current degradation time of MLCCs using the Ni-Cu and Ni-Sn inner electrodes was longer than that of MLCCs using the Ni internal electrodes. In particular, the leakage current degradation of the MLCCs using Ni-Sn inner electrodes was significantly suppressed. This suppression effect increased as the thickness of the BaTiO3-based dielectrics decreased. This method of optimization of the Ni inner-electrode composition could lead to further miniaturization and increased capacity of MLCCs.