Electrical engineering

Physics

Engineering

Dielectric

Ceramic

Composite material

Power (physics)

Voltage

Grain size

Materials science

Power density

Pulse (music)

Energy density

Optoelectronics

Capacitor

Electric field

Engineering physics

Quantum mechanics

Energy storage

Pulsed power

Ceramics International

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).

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