Effect of La doping on the suppression of insulation resistance degradation in multi-layer ceramic capacitors

Abstract

Effect of La doping on the suppression of insulation resistance degradation in multi-layer ceramic capacitors (MLCCs) was investigated. The insulation resistance of La-doped (Ba, Sr)(Ti, Zr)O3 (La-doped BSTZ) MLCCs increased during the early phase of the highly accelerated life test (HALT). The insulation resistance of La-doped BSTZ-MLCCs immediately before breakdown was still higher than that at the early phase. This behavior during the early phase of HALT was eminent for La doping. However, the activation energy of the La-doped BSTZ-MLCCs was the same as those of other rare earth element-doped BaTiO3 MLCCs, suggesting that La-doped BSTZ-MLCCs were also degraded by the migration of oxygen vacancies. Thermally stimulated depolarization current analysis revealed that La-doped BSTZ-MLCCs exhibited trapping of the oxygen vacancies around the grain boundary, which suggested that trapping led to suppression of migration of the oxygen vacancies, and decreased polarization current. This trapping resulted in an increased insulation resistance.

P‐N Junction‐Driven Abnormal Electric Field Distribution in the Degraded Multilayer Ceramic Capacitors

“…[4][5][6] The oxygen vacancies migration from the anode to the cathode under the electric fields plays an important role in the resistance degradation of BaTiO 3 -based MLCCs, which can be usually measured by the thermally stimulated depolarization current (TSDC) method. [7][8][9][10] The previous TSDC studies during the highly accelerated lifetime test (HALT) demonstrated that oxygen vacancies migration dynamics, first, move to the grains and accumulate at the grain boundaries, then migrate across it and pile up close to the cathode, and finally, give rise to a remarkable degradation of the insulation resistance in MLCCs. As a result, understanding the fundamental mechanism between the oxygen vacancies migration process and the electric degradation evolution is very important.…”

Effect of Ho‐Dy co‐doping on the electrical properties and reliability of BaTiO3‐based nanoceramics for Base Metal Electrode Multilayer Ceramic Capacitor

“…Rare‐earth elements are the common additives to acquire highly reliable BaTiO 3 ‐based MLCC 13–16 . The mechanism of rare‐earth element doping can be divided into three types depending on their ionic radius 17 .…”

“…Rare-earth elements are the common additives to acquire highly reliable BaTiO 3 -based MLCC. [13][14][15][16] The mechanism of rare-earth element doping can be divided into three types depending on their ionic radius. 17 Sakabe et al reported that large ionic radius elements like La 3+ tend to concentrate in a certain grain with high density, while small rare-earth ions like Yb 3+ dominantly appear along the grain boundaries and the triple points.…”

Ferroelectric photovoltaic tensor in visible-light-active Fe-doped BaTiO3single crystals

“…11,12) The widespread usage of MLCCs more or less relies on the defect chemistry [13][14][15][16][17][18][19][20][21] established for SrTiO 3 and BaTiO 3 . At present, intensive efforts [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] have been made to explore nanostructured materials and devices using BaTiO 3 -based materials, whereas the deep understanding of defects is far from complete for Pb(Zr, Ti)O 3 , [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] (Bi, Na)TiO 3 , [54][55][56][57]…”