Yusheng Liu

Charge-discharge properties of lead zirconate stannate titanate ceramics

The charge-discharge properties of lanthanum- and niobium-doped lead zirconate stannate titanate ceramics were investigated by directly measuring the hysteresis loops, dielectric constants under a dc bias field, and pulse discharge current-time curves after varying charge-discharge circulations. It was found that there was no significant effect of the charge-discharge circulation on these properties. The first pulse current peak reached 1.8 kA at 40 kV/cm, and most of the stored charge was released in 500 ns. These results show that the obtained slanted ceramics with high energy density can withstand hundreds of charge-discharge circulations and are very promising for pulse capacitor applications.

Reversible pyroelectric response in Pb0.955La0.03(Zr0.42Sn0.40Ti0.18)O3 ceramics near its phase transition

Phase transition and pyroelectric behaviors of Pb0.955La0.03(Zr0.42Sn0.40Ti0.18)O3 (PLZST) ceramics were investigated as functions of temperature and electric field. Pyroelectric coefficient about 160×10−8 C cm−2 K−1 is detected at the electric-field-induce ferroelectric (FEIN) to antiferroelectric phase transition for the poled samples. Reversible pyroelectric response with a pyroelectric coefficient maximum about 50×10−8 C cm−2 K−1 is obtained when a dc bias is applied on the depoled sample simultaneously.

Low thermal hysteresis pyroelectric response near the ferroelectric/antiferroelectric phase transition in Pb0.97La0.02(Zr0.42Sn0.40Ti0.18)O3 ceramics

The phase state of Pb0.97La0.02(Zr0.42Sn0.40Ti0.18)O3 (PLZST2) ceramics was studied by transmission electron microscopy analysis as well as polarization versus electric field (P-E) hysteresis loops. The initial state of this PLZST2 composition is ferroelectric (FE) and it transforms into antiferroelectric (AFE) as temperature increases. Change in polarization during this FE/AFE phase transition results in large pyroelectric response. A pyroelectric coefficient maximum about 220×10−8 C cm−2 K−1 is obtained for 3 kV/mm poled sample. Reversible pyroelectric response with large pyroelectric coefficient (>75×10−8 C cm−2 K−1) and low thermal hysteresis (<1.5 °C) is obtained under a dc bias of 0.6 kV/mm.