Effect of Tetragonality on The Capacitance Aging of Multilayer Ceramic Capacitors with Ni Internal Electrodes

摘要

Effect of tetragonality on the capacitance aging under dc field has been studied.BaTi03 -based dielectrics with X7R characteristics and Y5V characteristicsfor multilayer ceramic capacitors (MLCCs) with Ni internal electrodes have been used for this study. Capacitance change strongly depends on grain size and temperature. It is supported that these factors affect tetragonality, and the change of tetragonality causes variation of capacitance change. New equation for capacitance aging is proposed considering the effect of particle volume, temperature, dc electric field and tetragonality. Effect of internal stress of MLCCs is also discussed. Capacitance change is also a function of internal stress.