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

Abstract

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.

Exceptional reliability of MLCCs enabled by defect‐engineered BaTiO3

“…The reliability of the devices is the most pivotal parameter for the next generation MLCCs. Various factors could affect the reliability of MLCCs, such as the density of devices, the grain size, the core–shell structure, and so forth 6,7 . Therefore, the properties of the starting powder, such as specific surface area, 8 tetragonality, 9 particle size distribution, 10 and especially Ba/Ti ratio, 11,12 and so forth, exert huge influence on the performance of MLCCs.…”

Ferroelectric polarization of tetragonal BiFeO3—an approach from DFT calculations for BiFeO3–BaTiO3 superlattices—

“…45,46) BiFeO 3 has an extraordinary large P s of 80-100 μC cm −2 along [111] c in rhombohedral R3c symmetry 47,48) (the subscript "c" denotes pseudocubic). Moreover, BiFeO 3 has a Curie temperature (T C ) of 830 °C, 47,48) which is much higher than that of PbTiO 3 (495 °C49) ) Barium titanate, BaTiO 3 , play an essential role for ceramic capacitor applications 50,51) and also for ferroelectricderived functions. [52][53][54][55][56] In tetragonal P4mm symmetry, Ti and Ba are displaced cooperatively along the polar c axis, leading to a P s of 26-29 μC cm −2 .…”