Effects of Grain Boundary and Segregated-Phases on Reliability of Ba(Ti,Zr)O3-Based Ni Electrode MLCs

概要

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The reliability in the highly accelerated life test (HALT) for multilayer ceramic capacitors (MLCs) composed of the Ba(Ti,Zr)O3-Gd-Mg-Mn-Si system was markedly improved by controlling the amount of SiO2 and the ratio of $\text{Ba}/(\text{Ti}+\text{Zr})$. We observed the following characteristics in the microstructures when the reliability was improved. 1) The segregated-phases, which consisted of Mg oxides and Si oxides, were dispersed well in the dielectric layers and their size was considerably small. 2) The corrosion resistance of grain boundaries was improved. 3) The electric potential as a contrast in the focused ion beam scanning ion microscopy was homogeneous in both the grains and the grain boundaries. We can design these microstructures by controlling the additives to generate BaMg2Si2O7 and BaSi2O5, which have low melting points.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2005-09-15