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Evaluation of electrical characteristics of locally degraded areas on exfoliated multilayered ceramic capacitors by thermal distribution analysis

The temperature distribution around a degraded area of an exfoliated multilayer ceramic capacitor (MLCC), just before electrical breakdown (pre-breakdown) was measured. The temperature increase of the heating spot was in good agreement with the temperature evaluated from Joule heating by the applied voltages and the current. The current–voltage characteristics and the temperature dependence on the insulation resistance of the exfoliated sample showed the same characteristics as unexfoliated samples. We have confirmed that the locally degraded areas dominate the electrical properties of pre-breakdown MLCCs.