Effect of sintering parameters on silver diffusion of (Zn,Mg)TiO3based multilayer ceramic capacitors

Autor: W‐H Lu, P‐R Tsai, Y‐C Lee
Rok vydání: 2011
Předmět:
Zdroj: Advances in Applied Ceramics. 110:99-107
ISSN: 1743-6761
1743-6753
DOI: 10.1179/1743676110y.0000000010
Popis: In this study, the effects of heating rate and two‐step sintering on the sintering behaviour, the microstructure and the silver diffusion of (Zn,Mg)TiO3 based multilayer ceramic capacitors (ZMT MLCCs) with pure silver electrodes were investigated. The energy dispersive spectroscopy results showed that the silver ions diffused into the dielectric layer significantly when ZMT MLCC was sintered directly up to 900°C with a fixed heating rate (conventional sintering). However, ZMT MLCC was presintered (first step sintering) at 600–800°C then sintered at 900°C (second step sintering); it was found to effectively suppress silver ion diffusion into the dielectric layer. For example, the concentration of silver ions was identified by energy dispersive spectrometer, and both the Ag ion concentrations for conventional and two‐step sintering are 2 and 0·1 at‐% respectively. In addition, SEM observations showed that the silver electrode of ZMT MLCCs was greatly discontinuous by conventional sintering. Unlike ...
Databáze: OpenAIRE
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