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Investigate on the Inter-Diffusion and Microstructure in Multilayer Ceramic Capacitors
Keywords: inter-diffusion, co-firing, multilayer capacitors
The inter-diffusion behavior in base-metal-electrode X7R type and Y5V type multilayer ceramic capacitors ( MLCCs) were studied respectively. The microstructure and diffusion phenomenon between dielectric layers and internal electrode layers( Ni) were investigated and analysis by SEM, TEM, HRTEM and EDS. It was found that there are two transition regions at both side of interface that are considered to be induced by the interdiffusion between the Ni layers and BaTiO3 layers during cofiring. The experimental results are also show that the diffusion capability of Ni diffuse into the ceramic layers stronger than that of BaTiO3 diffuse into Ni layers. The mechanism of interdiffusion in MLCCs was also discussed.
Zhilun Gui, Professor
Tsinghua University
Beijing 100084,

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