Effect of dielectric response on discharge properties of PLZST antiferroelectric ceramics

摘要

Dielectric capacitors play a key role in revolutionizing modern electronic and electrical devices. Among these capacitors, anti-ferroelectric (AFE) capacitors receive much attention due to nonlinear dielectric properties and high-power output. (Pb~(0.89)Ba~(0.08)La~(0.02))(Zr~(0.50)Sn~(0.40)Ti~(0.10))O~(3)AFE ceramic with excellent dielectric nonlinearity was prepared via the solid state reaction, and the influence of dielectric response on discharge properties of AFE ceramics was studied. The results showed that dielectric constant (ε) increased first and then decreased with electric field increasing and presented two peaks at 11.4 kV/cm and 16.9 kV/cm, corresponding to AFE–ferroelectric (FE) phase transition. Below 16.9 kV/cm, or before the AFE–FE phase transition, the discharge current increased. Beyond 16.9 kV/cm, or after AFE–FE phase transition, the current raised weakly and reached about 120A at 50 kV/cm, and it was hard to continue to increase the current after AFE–FE phase transitions. Therefore, dielectric response in AFEs had a great influence on the discharge performance. The results provided a simple method to select the appropriate working electric field for the practical application of AFEs capacitors.