Xiucai Wang

Temperature-dependent dielectric response of antiferroelectric (Pb 0.97 La 0.02 )(Zr 0.50 Sn 0.40 Ti 0.10 )O 3 ceramic

In practical applications, the operating temperature was an important performance of antiferroelectric (AFE) material. Temperature dependent dielectric response of (Pb0.97La0.02)(Zr0.50Sn0.40Ti0.10)O3 ceramics were studied in detail, the results showed that dielectric behavior were closely related to the two characteristic temperatures T0 and Tc. The hysteresis (P-E) loops exhibited ‘square’ double loops below T0, and changed to ‘slanted’ loops between T0 and Tc, and finally linear loops above Tc, simultaneously three kinds of nonlinear dielectric behavior were observed in the corresponding temperature regions. The tunability first increased and then decreased with increasing temperature, and exhibited best performance was between T0 and Tc. The results indicated that (Pb0.97La0.02)(Zr0.50Sn0.40Ti0.10)O3 AFE ceramics was an excellent dielectric tunable performance, and provided an easy way to optimize the operating temperature of AFE tunable devices.

High energy-storage performance and discharge properties of (Pb 0.98 La 0.02 )(Zr 0.45 Sn 0.55 ) 0.995 O 3 antiferroelectric thick films

High energy storage performance and discharge properties of (Pb_0.98La_0.02)(Zr_0.45Sn_0.55)_0.995O₃ antiferroelectric (AFE) thick films with thickness of 85μm fabricated via a rolling process were investigated by dielectric properties and discharge performance, and the influence of electric field and electrode areas on the discharge properties was emphasized. Energy storage density and the first current peak (I_max) presented a nonlinear increase with increasing electric field, and I_max increased to 56A at 350kV/cm with the electrode diameter of 2mm, together with the current density of 1830 A/cm², and exhibited nonlinear increase with the increasing electrode diameter, and about 128A as the electrode diameter of 5mm. However, the I_max only increased 2.24 times and lower than the theoretical value of 6.25, resulting in unexpectedly reduction of current density (~656A/cm²). As a result, the current density reduced but I_max increased as the electrode area increased. These results will be contribute to research on charge-discharge properties of AFEs, and indicate that AFE thick films obtained are very promising for the pulse power application.