Ultra-high energy storage performance under low electric fields in Na0.5Bi0.5TiO3-based relaxor ferroelectrics for pulse capacitor applications

By Lei Zhang, Y. Pu, Min Chen. Ceramics International, 2020

137 citations recorded by the source corpus.

Abstract High ambient temperature (>150 °C) of pulse power capacitors raises the strict requirements for dielectric ceramics. (1-x)Na0.5Bi0.5TiO3-xLaAlO3 ((1-x)NBT-xLA for short) dielectric ceramics with superior pulse discharge performance at high ambient temperature were designed and fabricated. With LA addition, pseudo-cubic structure and reduced tolerance factor were available, benefiting to enhance the relaxor behavior. The grain size and shape are greatly changed to submicron degree and square, respectively. The x = 0.03 sample shows typical pinched P-E loops and ultra-high Pm of 50 μC/cm2. The x = 0.07 sample exhibits ultra-high Wd of 3.18 J/cm3 and η of 60% under relative low field of 210 kV/cm mainly due to its high polarization 45 μC/cm2. This ceramic also shows a high power density of 20 MW/cm3, high pulse discharge energy density(WD) of 0.45 J/cm3, high current density of 400 A/cm2 and a high speed discharge duration of 80 ns at high ambient temperature (150 °C).

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/4cb1d23c4c0ae833a3551bb8f5c1a7712b51e4ea