Effect of microstructure on dielectric and fatigue strengths of BaTiO3

Electric Fatigue of Lead‐Free Piezoelectric Materials

“…If a bimodal grain distribution is present, microcracks are easily initiated at their boundaries . These microcracks serve as the origin for fatigue crack growth, local electric discharge, and failure during bipolar cycling leading to a decrease in strength with increasing fraction of coarse grains. In contrast, the reliability of BaTiO 3 ceramics under a DC load does not depend on the fraction of coarse grains, even though samples with a bimodal grain distribution show lower fatigue strength compared to samples consisting of only small grains …”

On the dielectric strengths of atmospheric plasma sprayed Al2O3, Y2O3, ZrO2–7% Y2O3 and (Ba,Sr)TiO3 coatings

“…The results showed that dielectric as well as fatigue strengths decrease significantly with increasing amount of coarse grains [8]. It is worth mentioning that the coating materials involved in this study namely the Al 2 O 3 , Y 2 O 3 , YSZ and BST have not been compared from the dielectric strength point of view so far.…”

Electrical Properties of BaTiO3-Based Multilayer Ceramic Capacitors Sintered with Plasma-Treated Glass Powder

“…The dielectric layer thickness (d), one of the key parameters in MLCC, has been reduced to below 1 m to improve the volumetric efficiency, which consequently results in the increase in electric field experienced by the dielectric layer, and therefore a high possibility of premature failure. [1][2][3][4][5][6][7][8][9] In the microstructure of the BaTiO 3 -based ceramic layer in MLCCs, less than 1 m thickness is composed of only several grains (depending on the grain size) and therefore, precise control of the microstructure is crucial in enhancing the reliability of MLCCs. It is known that the formation of coarse abnormal grains in the BaTiO 3 ceramics should be avoided in order to achieve a long lifetime under DC electrical loading.…”